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7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 1113
ibitfk ^ibhfk _r`nassihb F
N`ursa h
Mibitfk Eiktar Masibhamp
afkizfti`h witd Gukt irfta M^_Ly
_rfbhfh Ndfcrfv`rtyMirant`r NFA]
G]and (II] Cdfrfbpur) Gaglar-IAAA(Q^F) FNG(Q^F)
Gaglar IAAA -
N`gguhinfti`h `n
Ginr`wfva ]da`ry fhm ]andhiquas ^`n
Fhtahhf amp Rfva _r`pfbfti`h ^`n
Nkiqua e`r Fppkiam asafrnd ih Akantr`hin ]andh`k`by
Fmvfitf N`rp`rfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 2113
NH]AH]^
6 Eiktars fra Imafkky Kihafr ]iga Ihvfrifht systagslt Rdft fra Eiktars0
gt ]da ]rfhsear Euhnti`h
= Katrsquos labih w itd Lut tarw`rtd k`w pfss ndfrfntaristins
1 Rdara is Mibitfk Eiktar (Lik ihafr ]rfhse`rg)0
5 Rfrpihb
2 Rdara fra wa04 Mibitfk eiktar Masibh Ek`w Mifbrfg
9 Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
6E`uriar ]rfhse`rg Gatd`m
66Rihm`w Gatd`m
6ltEraquahny ^fgpkihb Gatd`m
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 3113
Eiktars fra Imafkky Kihafr ]iga Ihvfrifht systags
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 4113
Rdft fra Eiktars0
Ih tda prasaht n`htaxt e ik tars fra systags wdind fnnapt fhm rajant ^ibhfks
lfsam `h nritari`h sat up`h tdair eraquahnias E`kk`wihb fra tda typas `e
eiktars
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 5113
Rdatdar `r h`t `lvi`us ft tdis g`gaht Imafk Eik tars fra uhrafk izflka _rfntinfk
e ik tars fra masibham t` lrihb i t fs nk`sa fs p`ssilka t` tda imafk nfsa ]d`ubd `ur
`ljantiva is t` masibh mibitfk e ik tars warsquokk labih witd fhfkysis `e fhfk`b eik tars
Kat rsquos fhfkyza f k`w pfss e ik tar nirnuit wdind wa fra fkrafmy efgik ifr witd
Dara ]rfhsear Euhnti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 6113
Kat rsquos usa f sigpka GF]KFL n`ma lak`w t` pk`t B( jω) varsus rfmifh eraquahny ω
w7lt63 N763 gfbBjw76sqrt(6+(wN)Xlt)3 sagik`bx(wgfbBjw)3
xkflak(Eraquahny ih rfmsan ∜ k`b snfka)3 ykflak(Gfbhituma `e U`utUih)3
titka(Gfbhituma Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brimGF]KFL
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 7113
_dfsa asp`hsa
w7lt63N763pdfsaBjw7-ftfh(wN)64pi3sagik`bx(wpdfsaBjw)3
xkflak(Eraquahny ih rfmsan - k`b snfka)3
ykflak(_dfsa `e U`utUih - mabraas)3
titka(_dfsa Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brim
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 8113
^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
D_E L_E LE
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 9113
]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
B(s)
s 7 jw
U`utUih
7`ut
ih
ih `ut
UB(s)3
U
U B(s) 7 U
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 10113
^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 11113
Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 12113
agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 13113
tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 14113
sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 15113
ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 16113
Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 17113
]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 18113
H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 19113
Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 20113
Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 21113
Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 22113
Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 23113
Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 24113
Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 25113
Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 26113
Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 27113
Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 28113
Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 29113
Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 30113
Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 31113
Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 32113
K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 33113
Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 34113
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 35113
Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 36113
Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 37113
Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
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Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
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D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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NH]AH]^
6 Eiktars fra Imafkky Kihafr ]iga Ihvfrifht systagslt Rdft fra Eiktars0
gt ]da ]rfhsear Euhnti`h
= Katrsquos labih w itd Lut tarw`rtd k`w pfss ndfrfntaristins
1 Rdara is Mibitfk Eiktar (Lik ihafr ]rfhse`rg)0
5 Rfrpihb
2 Rdara fra wa04 Mibitfk eiktar Masibh Ek`w Mifbrfg
9 Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
6E`uriar ]rfhse`rg Gatd`m
66Rihm`w Gatd`m
6ltEraquahny ^fgpkihb Gatd`m
7222019 Digital Filter Design-DSP
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Eiktars fra Imafkky Kihafr ]iga Ihvfrifht systags
at
7222019 Digital Filter Design-DSP
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Rdft fra Eiktars0
Ih tda prasaht n`htaxt e ik tars fra systags wdind fnnapt fhm rajant ^ibhfks
lfsam `h nritari`h sat up`h tdair eraquahnias E`kk`wihb fra tda typas `e
eiktars
at
7222019 Digital Filter Design-DSP
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Rdatdar `r h`t `lvi`us ft tdis g`gaht Imafk Eik tars fra uhrafk izflka _rfntinfk
e ik tars fra masibham t` lrihb i t fs nk`sa fs p`ssilka t` tda imafk nfsa ]d`ubd `ur
`ljantiva is t` masibh mibitfk e ik tars warsquokk labih witd fhfkysis `e fhfk`b eik tars
Kat rsquos fhfkyza f k`w pfss e ik tar nirnuit wdind wa fra fkrafmy efgik ifr witd
Dara ]rfhsear Euhnti`h
7222019 Digital Filter Design-DSP
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Kat rsquos usa f sigpka GF]KFL n`ma lak`w t` pk`t B( jω) varsus rfmifh eraquahny ω
w7lt63 N763 gfbBjw76sqrt(6+(wN)Xlt)3 sagik`bx(wgfbBjw)3
xkflak(Eraquahny ih rfmsan ∜ k`b snfka)3 ykflak(Gfbhituma `e U`utUih)3
titka(Gfbhituma Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brimGF]KFL
7222019 Digital Filter Design-DSP
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_dfsa asp`hsa
w7lt63N763pdfsaBjw7-ftfh(wN)64pi3sagik`bx(wpdfsaBjw)3
xkflak(Eraquahny ih rfmsan - k`b snfka)3
ykflak(_dfsa `e U`utUih - mabraas)3
titka(_dfsa Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brim
7222019 Digital Filter Design-DSP
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^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
D_E L_E LE
7222019 Digital Filter Design-DSP
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
B(s)
s 7 jw
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
7222019 Digital Filter Design-DSP
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
7222019 Digital Filter Design-DSP
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 28113
Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 29113
Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 37113
Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 41113
Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 44113
S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 45113
Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 48113
p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
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gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
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Kihafr Eiktar ndfrfntaristins
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
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7222019 Digital Filter Design-DSP
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Eiktars fra Imafkky Kihafr ]iga Ihvfrifht systags
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Rdft fra Eiktars0
Ih tda prasaht n`htaxt e ik tars fra systags wdind fnnapt fhm rajant ^ibhfks
lfsam `h nritari`h sat up`h tdair eraquahnias E`kk`wihb fra tda typas `e
eiktars
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7222019 Digital Filter Design-DSP
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Rdatdar `r h`t `lvi`us ft tdis g`gaht Imafk Eik tars fra uhrafk izflka _rfntinfk
e ik tars fra masibham t` lrihb i t fs nk`sa fs p`ssilka t` tda imafk nfsa ]d`ubd `ur
`ljantiva is t` masibh mibitfk e ik tars warsquokk labih witd fhfkysis `e fhfk`b eik tars
Kat rsquos fhfkyza f k`w pfss e ik tar nirnuit wdind wa fra fkrafmy efgik ifr witd
Dara ]rfhsear Euhnti`h
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Kat rsquos usa f sigpka GF]KFL n`ma lak`w t` pk`t B( jω) varsus rfmifh eraquahny ω
w7lt63 N763 gfbBjw76sqrt(6+(wN)Xlt)3 sagik`bx(wgfbBjw)3
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titka(Gfbhituma Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brimGF]KFL
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_dfsa asp`hsa
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xkflak(Eraquahny ih rfmsan - k`b snfka)3
ykflak(_dfsa `e U`utUih - mabraas)3
titka(_dfsa Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brim
7222019 Digital Filter Design-DSP
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^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
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7222019 Digital Filter Design-DSP
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
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7222019 Digital Filter Design-DSP
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
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euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
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pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
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ω
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
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wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
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7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
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Ndalysdav ]ypa-I Eik tars
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
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w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
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n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
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igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
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pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
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y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
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x(h) y(h)
x(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 112113
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 113113
]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Rdft fra Eiktars0
Ih tda prasaht n`htaxt e ik tars fra systags wdind fnnapt fhm rajant ^ibhfks
lfsam `h nritari`h sat up`h tdair eraquahnias E`kk`wihb fra tda typas `e
eiktars
at
7222019 Digital Filter Design-DSP
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Rdatdar `r h`t `lvi`us ft tdis g`gaht Imafk Eik tars fra uhrafk izflka _rfntinfk
e ik tars fra masibham t` lrihb i t fs nk`sa fs p`ssilka t` tda imafk nfsa ]d`ubd `ur
`ljantiva is t` masibh mibitfk e ik tars warsquokk labih witd fhfkysis `e fhfk`b eik tars
Kat rsquos fhfkyza f k`w pfss e ik tar nirnuit wdind wa fra fkrafmy efgik ifr witd
Dara ]rfhsear Euhnti`h
7222019 Digital Filter Design-DSP
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Kat rsquos usa f sigpka GF]KFL n`ma lak`w t` pk`t B( jω) varsus rfmifh eraquahny ω
w7lt63 N763 gfbBjw76sqrt(6+(wN)Xlt)3 sagik`bx(wgfbBjw)3
xkflak(Eraquahny ih rfmsan ∜ k`b snfka)3 ykflak(Gfbhituma `e U`utUih)3
titka(Gfbhituma Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brimGF]KFL
7222019 Digital Filter Design-DSP
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_dfsa asp`hsa
w7lt63N763pdfsaBjw7-ftfh(wN)64pi3sagik`bx(wpdfsaBjw)3
xkflak(Eraquahny ih rfmsan - k`b snfka)3
ykflak(_dfsa `e U`utUih - mabraas)3
titka(_dfsa Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brim
7222019 Digital Filter Design-DSP
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^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
D_E L_E LE
7222019 Digital Filter Design-DSP
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
B(s)
s 7 jw
U`utUih
7`ut
ih
ih `ut
UB(s)3
U
U B(s) 7 U
at
7222019 Digital Filter Design-DSP
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
7222019 Digital Filter Design-DSP
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
7222019 Digital Filter Design-DSP
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 28113
Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
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≦Z-6
x(h) y(h)
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y(h)
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Z-6
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Z-M
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I M7I
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x(h) y(h)
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y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Rdatdar `r h`t `lvi`us ft tdis g`gaht Imafk Eik tars fra uhrafk izflka _rfntinfk
e ik tars fra masibham t` lrihb i t fs nk`sa fs p`ssilka t` tda imafk nfsa ]d`ubd `ur
`ljantiva is t` masibh mibitfk e ik tars warsquokk labih witd fhfkysis `e fhfk`b eik tars
Kat rsquos fhfkyza f k`w pfss e ik tar nirnuit wdind wa fra fkrafmy efgik ifr witd
Dara ]rfhsear Euhnti`h
7222019 Digital Filter Design-DSP
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Kat rsquos usa f sigpka GF]KFL n`ma lak`w t` pk`t B( jω) varsus rfmifh eraquahny ω
w7lt63 N763 gfbBjw76sqrt(6+(wN)Xlt)3 sagik`bx(wgfbBjw)3
xkflak(Eraquahny ih rfmsan ∜ k`b snfka)3 ykflak(Gfbhituma `e U`utUih)3
titka(Gfbhituma Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brimGF]KFL
7222019 Digital Filter Design-DSP
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_dfsa asp`hsa
w7lt63N763pdfsaBjw7-ftfh(wN)64pi3sagik`bx(wpdfsaBjw)3
xkflak(Eraquahny ih rfmsan - k`b snfka)3
ykflak(_dfsa `e U`utUih - mabraas)3
titka(_dfsa Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brim
7222019 Digital Filter Design-DSP
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^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
D_E L_E LE
7222019 Digital Filter Design-DSP
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
B(s)
s 7 jw
U`utUih
7`ut
ih
ih `ut
UB(s)3
U
U B(s) 7 U
at
7222019 Digital Filter Design-DSP
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
7222019 Digital Filter Design-DSP
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
7222019 Digital Filter Design-DSP
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 28113
Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 29113
Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 37113
Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 44113
S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 46113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 48113
p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
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Kihafr Eiktar ndfrfntaristins
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
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7222019 Digital Filter Design-DSP
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Kat rsquos usa f sigpka GF]KFL n`ma lak`w t` pk`t B( jω) varsus rfmifh eraquahny ω
w7lt63 N763 gfbBjw76sqrt(6+(wN)Xlt)3 sagik`bx(wgfbBjw)3
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titka(Gfbhituma Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brimGF]KFL
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_dfsa asp`hsa
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xkflak(Eraquahny ih rfmsan - k`b snfka)3
ykflak(_dfsa `e U`utUih - mabraas)3
titka(_dfsa Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brim
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^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
D_E L_E LE
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
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euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
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pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
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ω
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^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
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wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
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Ndalysdav ]ypa-I Eik tars
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
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w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
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pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
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Likihafr trfhse`rgfti`h
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
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fhm
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Igpuksa Ihvfrifht ]rfhse`rg
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s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 66113
Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦Z-6
x(h) y(h)
x(h)
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y(h)
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Z-6
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Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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_dfsa asp`hsa
w7lt63N763pdfsaBjw7-ftfh(wN)64pi3sagik`bx(wpdfsaBjw)3
xkflak(Eraquahny ih rfmsan - k`b snfka)3
ykflak(_dfsa `e U`utUih - mabraas)3
titka(_dfsa Ndfrfntaristins `e lfsin N k`w-pfss eiktar)3 brim
7222019 Digital Filter Design-DSP
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^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
D_E L_E LE
7222019 Digital Filter Design-DSP
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
B(s)
s 7 jw
U`utUih
7`ut
ih
ih `ut
UB(s)3
U
U B(s) 7 U
at
7222019 Digital Filter Design-DSP
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
7222019 Digital Filter Design-DSP
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
7222019 Digital Filter Design-DSP
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 29113
Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 60113
E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
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∖ ∖ ∖ ∖
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
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7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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^igikfrky D_EL_E amp LE nfh la prasahtam ]rfhsear euhnti`hs fra sigukftam
lak`w
D_E L_E LE
7222019 Digital Filter Design-DSP
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
B(s)
s 7 jw
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at
7222019 Digital Filter Design-DSP
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
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]darae`ra B(s) sigpk ieias t`
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pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 62113
p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
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≦Z-6
x(h) y(h)
x(h)
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y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
x(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 113113
]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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]da ]rfhsear Euhnti`h
It sd`ukm la quita n kafr ly h`w tdft fs efr fs n`gputfti`hs fra n`hnarham it is
tda trfhsear euhnti`h wdind is nfknukftam avary t iga t` e ihm f e ik tar rsquos e raquahny
rasp`hsa G`ra`var trfhsear euhnti`hs fra h`t mapahmaht `h I_ `r _ `e systags fhm tday n`gpkataky ndfrfntariza tda systags ih eraquahny m`gfih
]darae`ra t` fhfkyza fhm masibh f eiktar systag wa `hky haam its trfhsear
euhnti`h t` la ch`wh ]da ihput sibhfk is mirantky guktipkiam witd tda trfhsear
euhnti`h t` bat tda masiram eiktaram `utput ^ibhfk _r`nassihb is fkk fl`ut
n`gputfti`hs wdatdar fhfk`b `r mibitfk eiktars `hky trfhsear euhnti`hs fra
fhfkyzam fhm masibham dara Dahnae`rtd `hky trfhsear euhnti`hs fra tfkcamfl`ut fhm h`t tdair nirnuit igpkagahtfti`hs
B(s)
s 7 jw
U`utUih
7`ut
ih
ih `ut
UB(s)3
U
U B(s) 7 U
at
7222019 Digital Filter Design-DSP
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
7222019 Digital Filter Design-DSP
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
7222019 Digital Filter Design-DSP
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A M^_
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
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G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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gftrixraprasahtfti`h
A (z )
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A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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^` efr wfs tdis eiktar masibh0
Fk td`ubd wa n`gputam fhm sigukftam fkk cihm `e eik tars s` efr f vary igp`rtfht
quasti`h sti kk ragfihs t` la fhswaram- Rfs tdis e ik tar masibh0 H` i t wfs h`t Qp t ik k
h`w wa n`ukm `hky fhfkyza bivah nirnui ts fhm nfknukfta tdai r trfhsear euhnti`hs
_ranisaky wa n`ukm h`t spaniey tda nut`ee eraquahny lfhmwimtd fttahuft i`h atn
fnn`rmihb t` `ur wisdas Ra dfm t` fnnapt wdftavar ndfrfntaristins tda eiktars
dfm
Rdft is Masibh0
]da `tdar w`rm e`r masibh is syhtdasis ^` efr er`g f bivah nirnuittrfhsear
euhnt i`h i ts ndfrfntarist ins(rasuk t) wfs nfknukftam `r fhfkyzam Ih Masibh- er`g f
bivah ndfrfntaristins(rasukt) tda nirnuittrfhsear euhnti`h is syhtdasizam Ih masibh
`r syhtdasis ndfrfntaristins(rasukt) fra spanie iam fnn`rmihb t` `ur wisdas viz wa
nfh spaniey- lfhmwimtd `e tda pfss lfhm st`p lfhm fttahuft i`h nut`ee eraquahnyatn fhm tda n`rrasp`hmihb nirnui t `r trfhsear euhnt i`h is syhtdasizam t` sft isey fk k
`ur spanieinfti`hs
Ditdart` tda mieearahna latwaah fhfkysis fhm syhtdasis sd`ukm la n`hspinu`us
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
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ω
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6B(j ) 7
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^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
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7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
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k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
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Ndalysdav ]ypa-I Eik tars
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
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w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 62113
p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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x(h) y(h)
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Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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s(h) 6 h7 paraGltGhellip
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M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Katrsquos labih witd Luttarw`rtd k`w pfss ndfrfntaristins
It sd`ukm la h`tam tdft `ur masibh stfrts witd tda eihfk masiram rasukt dara it is tda
Luttarw`rtd k`w pfss eiktar ndfrfntaristin p`kyh`gifk Flt(w) is ch`wh fs tda
gfbhituma squfram euhnti`h wn is tda gtmL nut`ee eraquahny
at
7222019 Digital Filter Design-DSP
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
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GQK]I-F]A M^_
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
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sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
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M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
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h7
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tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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agaglarFlt(w) is h`t B(s) Itrsquos f k`hb wfy t` b` B(s) is tda eihfk fhswar `e tda
masibh
Rdy h`t tfca f masibh axfgpka0
Axfgpka 6
Mariva tda trfhsear euhnt i`h e`r tda tdirm `rmar (c7gt ) Luttarw`rtd k`w-pfss e ik tar
witd h`rgfkizam nut`ee eraquahny wn76rfmsan
E`r c7gt wn76rfmsan sulstitutihb slt7(jw)lt7-wlt
_`kas `e tda fl`va euhnti`h fra six ih huglars fhm fra k`nftam ft
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
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pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
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ω
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^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
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bat
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
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]darae`ra
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
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Ndalysdav ]ypa-I Eik tars
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
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w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
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7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
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tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
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]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
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7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
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7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
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≦Z-6
x(h) y(h)
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Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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tdasa six p`kas kia `h tda nirnugearahna e tda nirnka witd rfmius wn76rfmsan fs
sd`wh ]da trfhsear euhnti`h is e`rgam ly kaet dfke pkfha p`kas sgt s= fhm s1
tdarae`ra B(s) is fs bivah lak`w
^ihna wa dfva gftkfl ih dfhm wa nfh usa sygs fhm axpfhm tda sygl`kin
`ljant avfkuft`rs t` sigpkiey tda mah`gihft`r `e B(s) Gftkfl n`ma is
axanutam lak`w
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
(s+6lt-6ltigtX(6lt))(s+6)(s+6lt+6ltigtX(6lt))
axpfhm(mah)
fhs 7sXgt+ltsXlt+lts+6
]darae`ra B(s) sigpk ieias t`
]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
7222019 Digital Filter Design-DSP
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ω
ω ω ω gt lt
6B(j ) 7
-j - lt + ltj +6
^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 44113
S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 46113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
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ihnrafsa
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m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
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7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
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Guktistfba Ihtarp`kft`rs
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ippka fhm EI eik tar kahbtd(G) rakfti`h
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h7
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7222019 Digital Filter Design-DSP
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Mirant e`rg
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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sygs s3 mah7(s+6lt-sqrt(gt)jlt)(s+6)(s+6lt+sqrt(gt)jlt)
mah 7
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]da fl`va B(s) is tda masiram trfhsear euhnti`h e`r tdirm `rmar c7gt Luttarw`rtd k`w
pfss eiktar witd h`rgfkizam nut`ee eraquahny wn76rfmsan
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^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
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]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
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7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
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]darae`ra
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
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w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
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7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
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7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
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7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
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Fetar eurtdar sigpkieinfti`h
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
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]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
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7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
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ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
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sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
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h7
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tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
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7222019 Digital Filter Design-DSP
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
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7222019 Digital Filter Design-DSP
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ω
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^ulstitut ihb s7jw3 Gftkfl n`ma is sigukftam lak`w
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
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wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
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7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
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Ndalysdav ]ypa-I Eik tars
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
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7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
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7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
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Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
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7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
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usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
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I I
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x(h) y(h)
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Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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s(h) 6 h7 paraGltGhellip
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
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6
-6 -(G-6)
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(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Ie wa nfh matargiha tda vfri`us vfkuas- f hellip fc fhm l tdah `ur syhtdasis `e
trfhsear euhnti`h wikk la `var E`kk`wihb tda pr`namura `e fl`va axfgpka
n`aeeiniahts e`r c76 t` 1 ft h`rgfk izam eraquahny wn 76rfmsan fra tflukftam lak`w
Ufkuas `e tda n`aeein iahts fi e`r c76 t` 1
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 37113
Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 44113
S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 46113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 48113
p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
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h7
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D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
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7222019 Digital Filter Design-DSP
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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]da tflka wdind wa just sfw is e`r h`rgfkizam eraquahny wn76rfmsan]da trfhsear
euhnt i`h n`rrasp`hmihb t` fntufk nut`ee eraquahny nfh la ltfiham er`g tda
rakfti`h bivah lak`w
E`r
wh`rg7 wn76rfmsan
]da masiram st`p lfhm fttahufti`hs nfh la nfknukftam ly pk`ttihb Flt(w) ih mL
wdind is 6k`b|Flt(w)| vs w e`r vfri`us vfkuas `e c N`gputihb tdis ih Gftkfl wa
bat
AE
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
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h t
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h
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7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
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p ] -6i76 i76i
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s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
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usam e`r axfgpka
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6
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7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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I M7I
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s(h) 6 h7 paraGltGhellip
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
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^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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H`w wa fra rafmy e`r haxt axfgpka
Axfgpka lt
Qsihb tda fttahuft i`h nurvas fl`va mar iva tda trfhsear euhnt i`h `e f Luttarw`rtd
k`w∜pfss fhfk`b ei ktar witd pfss lfhm lfhmwimtd `e 1 rfmsan fhm fttahufti`h ih
tda st`p lfhm `e ft kafst -gt2mL e`r eraquahnias kfrbar tdfh 61 rfmsan
Ra raear t` eibura fl`va fhm ft ω ωN761 17gt wa saa tdft tda vartinfk kiha ft tdis vfkua
nr`ssas tda c7= nurva ft fppr`xigftaky -gt2mL wdind sftiseias `ur raquiragaht
]darae`ra
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
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Ndalysdav ]ypa-I Eik tars
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
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7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
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7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
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usam e`r axfgpka
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7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
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Fetar eurtdar sigpkieinfti`h
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
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makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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I I
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I M7I
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s(h) 6 h7 paraGltGhellip
`tdarwisa
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
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6
-6 -(G-6)
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(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Fetar eurtdar avfkufti`h
^igukftihb witd GF]KFL
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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ω
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∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
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+ z A (z )
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gftrixraprasahtfti`h
A (z )
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D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Ndalysdav ]ypa-I Eik tars
7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 37113
Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 40113
Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 41113
Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 44113
S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 46113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 48113
p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
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ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
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7222019 Digital Filter Design-DSP
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h7
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Rdft fl`ut D_E L_ELE0
E`kk`wihb fra tda trfhse`rgs usam t` n`hvart k`w pfss eiktars t` `tdar typas ly
trfhse`rgihb tda n`gpkax vfriflka mdashsrsquo
7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
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7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
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usam e`r axfgpka
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7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
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rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
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ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
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Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
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(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
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7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 44113
S W
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7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
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Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
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GQK]I-F]A
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
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7222019 Digital Filter Design-DSP
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
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7222019 Digital Filter Design-DSP
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Its tiga t` masibh f lfhm-pfss ei ktar
Axfgpka gt
N`gputa tda trfhsear euhnti`h e`r f tdirm-`rmar lfhm-pfss Luttarw`rtd eik tar witd
gtmL pfss-lfhm er`g gtCrfmsan t` =Crfmsan er`g f tdirm-`rmar k`w-pfssLuttarw`rtd eik tar witd h`rgfkizam nut`e e eraquahny
Er`g tflkas `utkiham lae`ra e`r wn76rfmsan wa bat B(s) fs lak`w
apkfnihb s ly
B(s)76(sXgt(wlt-w6)Xgt+gts(wlt-w6)Xgtw6wlt+gts(wlt-w6)Xgtw6XltwltXlt+6sXgt(wlt-
w6)Xgtw6XgtwltXgt+ltsXlt(wlt-w6)Xlt+=(wlt-w6)Xltw6wlt+ltsXlt(wlt-
w6)Xltw6XltwltXlt+lts(wlt-w6)+lts(wlt-w6)w6wlt+6)
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
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usam e`r axfgpka
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7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
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Fetar eurtdar sigpkieinfti`h
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
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makfy t`
gfca
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gatd`m
EI Masibh
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pkfnagaht
masibh
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ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
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t` tdar
typas
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trfhse`rgfti`h
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euhnti`h
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E`uriar
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trfhse`rg
gatd`m
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at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
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fti`h
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t` tdar
typas
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E`uriar
trfhse`rggatd`m
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Masibh
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Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
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7A (z )+ z A (z )+ z A (z )+
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7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Gund mieeinukt t` manipdar td`ubd itrsquos h`t tda nfsa witd GF]KFL _k`ttihb tda
trfhsear euhnt i`h ih GF]KFL
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
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7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
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bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
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bullRa haam t` ch`w wdft fra EI fhm II eik tars
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
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7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
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Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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-6 -(G-6)
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+ z A (z )
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gftrixraprasahtfti`h
A (z )
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A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Mieearahna Latwaah fh Fhfk`b fhm Mibitfk Eiktar
Fhfk`b Eiktar Mibitfk Ei ktar
Fhfk`b e iktars fra nirnuitigpkagahtfti`hs witd rasist`rs
nfpfnit`rs ihmunt`rs atn
_r`brfgs kica GF]KFL t`batdar witd
n`gputar nfh `hky sigukfta fhfk`b
eiktars
Fhfk`b e iktars pr`nass fhfk`b s ibhfks
Fhfk`b Eiktar dfrmwfra nfh h`t m`
fhytdihb aksa tdfh ei ktarihb
Mibitfk eiktars fra n`gputfti`hfk pr`nass
igpkagahtam witd fkb`ritdgs
_r`brfgs k ica GF]KFL t`batdar witd
n`gputar nrafta mibitfk eik tars
Mibitfk eiktars pr`nass misnrata fhm
mibitfk sibhfks
Maminftam dfrmwfra ch`wh fs M^_
pr`nass`rs (ab ]I- ]G^gtltN526gt M^C)fra ginr`pr`nass`rs fhm nfh m` fkg`st
fkk n`gputfti`hfk w`rc `tdar tdfh
eiktarihb
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
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7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
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tda gfppihb e`rgukf is
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]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
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Fetar eurtdar sigpkieinfti`h
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
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≦Z-6
x(h) y(h)
x(h)
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y(h)
y(h)
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Z-6
Z-6
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Z-M
Z-6M
Z-K
Z-6K
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I M7I
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x(h) y(h)
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y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Rdara is Mibitfk Eiktar0
Ra gfy ihtuitivaky uhmarstfhm tdft mibitfk systags fra misnratizam varsi`hs `e
tdair fhfk`b n`uhtarpfrt Ra fks` ch`w tdft tda r`ka wdind is tfcah ly Kfpkfna
trfhse`rgs ih fhfk`b systags tda sfga is tfcah ly Z trfhse`rg ih mibitfk m`gfih
]darae`ra t` gfca f mibitfk eiktar er`g fhfk`b eik tar wa just haam t` ndfhba tdatrfhsear euhnti`h er`g Kfpkfna m`gfih t` Z m`gfih ^und f Ndfhba is ch`wh fs
Likihafr trfhse`rgfti`h
B(s)U`ut(s)Uih(s)
B(z)Uih(z) U`ut(z)
I g p uk s aI hv fr i f
h t
] r fh s e `r g f t i `
h
at
L i k i h a f r
] r f h s e ` r g f t i ` h
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 46113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
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x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
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x(h) y(h)
x(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Likihafr trfhse`rgfti`h usas tda trfhse`rgfti`h
t` trfhse`rg tda kaet-dfke `e tda s-pkfha iht` tda ihtari`r `e tda uhit nirn ka ih tda z
-pkfha Ra wi kk misnuss `hky tda lik ihafr trfhse`rgfti`h ih tda prasaht n`htaxt
]s is tda sfgpkihb rfta wdind is ranipr`nfk `e sfgpkihb eraquahny e s
Fhfk`b fhm Mibitfk Eraquahny
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 66113
Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
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≦Z-6
x(h) y(h)
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y(h)
y(h)
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Z-6
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Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Ih fl`va axprassi`h wf is fhfk`b eraquahny fhm wm is mibi tfk eraquahny
Rfrpihb
]da e`kk`wihb Likihafr trfhse`rgfti`h is fks` usam
fhm
at
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
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y(h)
y(h)
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y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
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x(h) y(h)
x(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Igpuksa Ihvfrifht ]rfhse`rg
It is `ltfiham ly sfgpkihb tda igpuksa rasp`hsa `e fhfk`b e iktar
d(h)7 df(h]s)
i s
i s
G Gi i
p ] -6i76 i76i
p ] -6i
F Fie D(s) 7 tdah D(z) 7
s - p 6- a z
tda gfppihb e`rgukf is
6 6
s - p 6- a z
∽
∖ ∖
]da D(s) nfh la lr`cah iht` pfrtifk erfnti`hs fhm igpuksa ihvfrifht gatd`m la
usam e`r axfgpka
6 lt 6
6
6 lt
6 6 6( )
( 6)( lt) ( 6) ( lt)6 6
( )(6 ) (6 )
ltgtlt5( )
6 1gtlt =94
] ]
Ie D s
s s s s
tdahD za z a z
z D z
z z
∜ ∜ ∜ ∜
∜
∜ ∜
7 7 ∜
+ + + +7 ∜
∜ ∜
7∜ +
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 66113
Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦Z-6
x(h) y(h)
x(h)
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y(h)
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y(h)
y(h)
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Z-6
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Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Axfgpka =
N`gputa tda trfhsear euhnti`h B(z) `e f k`w-pfss mibitfk eiktar witd gtmL nut`ee
e raquahny ft ltDz fhm fttahuft i`h `e ft kafst 6mL e`r eraquahnias braftar tdfh
=Dz ]da sfgpkihb eraquahny e s is ltDz
Er`g tda pranamihb axfgpkas `h fhfk`b masibh wa nfh nfknukfta tdft tda
e`kk`wihb Bh(s) gaats tda masibh raquiragahts
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
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I
I I
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x(h) y(h)
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Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Fetar eurtdar sigpkieinfti`h
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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+ z A (z )
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gftrixraprasahtfti`h
A (z )
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7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Avfkuftihb tda Gftkfl N`ma
lz7S521 6gt=9 521W3 fz7S6 ∜66=lt9 =6lt2W3 SBz w]W7eraqz(lzfzltlt)3
sagik`bx(w]fls(Bz)) fxis(S6 6 6W) d`km `h3
titka(Mibitfk K`w-_fss Eiktar) xkflak(Eraquahny ih Dz) ykflak(Gfbhituma)brim
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
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Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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I I
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x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
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(G-6)
+ z A (z )
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gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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K`w pfss mibitfk II spanieinfti`hs nfh fks` la bivah fs
Rfrpam eraquahnias fra bivah ly
Dara mdashirsquo is fhy sulsnript
E`r Luttarw`rtd Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` fl`va
spanieinfti`hs fs e`kk`ws
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
Mi it k Eikt M i
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
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tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
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+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
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7A (z )+ z A (z )+ z A (z )+
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Baharfk trfhsear euhnti`h B(s) e`r fhy p`kyh`gifk euhnti`h nfh la writtah fs
Luttarw`rtd n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny Ωn nfh la rakftam t` tda eiktar
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
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t` tdar
typas
Rfrpihb
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trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
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at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
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gfca
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7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
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gag`ry
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k`las ih tda st`p lfhm
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gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
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7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 58113
F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
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h7
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D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
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Mirant e`rg
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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E`r Ndalysdav Eiktars tda `rmar H fhm nut`ee eraquahny n nfh la rakftam t` tda eiktar
spanieinfti`hs spanieinfti`hs fs e`kk`ws
Ndalysdav n`aeeiniahts fra bivah ly
F is tda bfih e B(s) wdind is 76 e`r pfssiva eiktars
7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
at
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
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t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
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Eihfk
Masibh
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E`uriar
trfhse`rg
gatd`m
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7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
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7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
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ih tda pfss lfhm
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k`las ih tda st`p lfhm
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7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
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II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
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7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
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7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
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7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
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7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
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7222019 Digital Filter Design-DSP
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∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
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h7
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
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7222019 Digital Filter Design-DSP
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Rdara fra wa0
bullRa gust p`hmar h`w wdft is `ur nurraht stftus `e kafrhihb mibitfk eik tar
bull Fra wa m`ha witd it0 Ie h`t tdah wdft aksa sd`ukm la kafrht t` n`gpkatait
bull Rdft fra tda p`ssilka nkfssieinfti`hs `e mibitfk eiktar masibh
bullRa ch`w d`w t` `ltfih mibitfk eiktar er`g fhfk`b masibh usihb likihafrtrfhse`rg
bullRa haam t` ch`w wdft fra EI fhm II eik tars
bull Ra haam t` ch`w tdft ie mibitfk ei ktars fra lr`fmky nftab`rizam uhmar IIfhm EI tdah uhmar wdind nftab`ry w`ukm lik ihafr trfhse`rg efkk fhm wdy0
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7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
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ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
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Eihfk
Masibh
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7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
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rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
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typas
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Billrsquossnikkfti`hs
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`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
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EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
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gag`ry
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k`las ih tda st`p lfhm
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n`gpkaxity fhm ahbfbas kassar
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Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
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7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
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II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
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7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
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7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
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bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
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rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
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Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
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ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
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tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
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∖ ∖ ∖ ∖
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c7 g7 c7 g7
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d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
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7A (z )+ z A (z )+ z A (z )+
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
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rasp`hsa
Rihm`w
gatd`m
EI Masibh
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masibh
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masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
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K`w pfss
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t` tdar
typas
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Likihafr
trfhse`rgfti`h
Rihm`w
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ag`vfk e
Billrsquossnikkfti`hs
E`uriar
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Eihfk
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Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
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(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
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-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
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+ z A (z )
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gftrixraprasahtfti`h
A (z )
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D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Fhswar Ga
Rdy is Likihafr trfhse`rg fss`niftam witd spantrfk fppr`fnd0
Ih `ur stumy s` efr wdatdar fhfk`b `r mibi tfk wa fhfkyzam fhm syhtdasizam
trfhsear euhnti`hs `hky wdind fra eraquahnyspantrfk m`gfih qufhtitias
]darae`ra h`t just likihafr trfhse`rgfti`h lut `ur ahtira stumy s` efr dfm laaheraquahny m`gfih stumy
Rdy is EI fss`niftam witd spantrfk fppr`fnd0
Er`g sibhfks fhm systags wa ch`w tdft tda qufhtity wdind is ch`wh fs
trfhsear euhnti`h ih eraquahny m`gfih is ch`wh fs igpuksa rasp`hsa ih tiga
m`gfih
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
x(h)
x(h)
x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
≦
≦
≦
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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]darae`ra f masibh wdind syhtdasizas igpuksa rasp`hsa ihstafm `e trfhsear
euhnti`h is fss`niftam witd trfhsiahttiga-m`gfih masibh fhm Eihita igpuksa
rasp`hsa (EI) is `ha `e td`sa
Rdft is Eihita fl`ut EI0
]` axpkfih tdis kat us k``c ft tda igpuksa rasp`hsa `e fh imafk eik tar
]rfhsear Euhnti`h Igpuksa asp`hsa
Eraquahny M`gfih ]iga M`gfih
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 45113
Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 46113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 48113
p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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I M7I
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s(h) 6 h7 paraGltGhellip
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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i
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+ z A (z )
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gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Ra nfh `lsarva tdft tda igpuksa rasp`hsa `e fh imafk eiktar is ihmaam iheihita fhm
is tdarae`ra h`h-nfusfk ^ihna h`h-nfusfk igpuksa rasp`hsa nfh h`t la prfntinfkky
igpkagahtam ih tiga m`gfih tdarae`ra it is truhnftam fhm gfma eihita (EI) fhm
tdft is e ih ita fl`ut EI
Ie II is t` t iga m`gfih tdah wdy is i t tfbbam ih eraquahny m`gfih0
Ra n`ukm saa tdft II is h`t p`ssilka t` igpkagaht ih tiga m`gfih lanfusa `e its
h`h-nfusfk hftura h tda `tdar dfhm ih eraquahny m`gfih fppr`fnd sihna wa m`
h`t mafk witd igpuksa rasp`hsa tdarae`ra wa havar truhnfta it fs f rasukt fkktrfhsear euhnti`hs ih eraquahny m`gfih fppr`fnd rasukt ih iheihita igpuksa
rasp`hsa (II) ]dis gafhs tdft II masibh is t` eraquahny m`gfih fppr`fnd
Katrsquos fbfih dfva f k``c ft tda mieearaht nftab`rias typas fhm stfbas `e mibitfk eiktarmasibh t` uhmarstfhm tdag lattar
Mibitfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
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]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
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lt
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Ϗ
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7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
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n
n
6d(h) 7 D(a )a m
lt
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e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
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dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
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br`up makfym m
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7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 62113
p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
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I I
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x(h) y(h)
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Z-6
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Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Mibitfk Eiktar Masibh
Eraquahny
sfgpkihb
gatd`m
II Masibh
]rfhsiaht ]iga M`gfih Fppr`fnd ^pantrfk Eraquahny M`gfih Fppr`fnd
Ihtr`muna
makfy t`
gfca
nfusfk
igpuksa
rasp`hsa
Rihm`w
gatd`m
EI Masibh
_`ka-zar`
pkfnagaht
masibh
Igpuksa
ihvfrifht
masibh
Likihafr
trfhse`rg
fti`h
Fhfk`b
Masibh
K`w pfss
pr`t`typa
]rfhse`rg
t` tdar
typas
Rfrpihb
Likihafr
trfhse`rgfti`h
Rihm`w
euhnti`h
ag`vfk e
Billrsquossnikkfti`hs
E`uriar
trfhse`rggatd`m
Eihfk
Masibh
Eihfk
Masibh
]ruhnfti`h
`e II t`gfca EI
E`uriar
trfhse`rg
gatd`m
Eihfk
Masibh
at
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 46113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 47113
_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
x(h)
x(h)
x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
≦
≦
≦
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Eihita Igpuksa asp`hsa (EI) Eiktar Masibh
Rdftavar eiktar masibh wa mim tikk h`w wfs II masibh wdara wa mim h`t truhnfta
tda igpuksa rasp`hsa lut h`w it is turh t` stumy EI masibh wdind is f tiga
m`gfih fppr`fnd fhm tdus it truhnftas tda igpuksa rasp`hsa
Rdy EI0
]` fhswar tdis katrsquos n`gpfra pr`s fhm n`hs `e l`td tda masibhs
EI Bivas Kihafr pdfsa rasp`hsa wi td
ih tda pfss lfhm
EI dfs g`ra huglar `e sima k`las ih
st`p lfhm tdfh II
EI dfs g`ra n`gputfti`hfkn`gpkaxity fhm ahbfbas g`ra
gag`ry
II dfs g`stky h`h k ihafr pdfsa
rasp`hsa
II dfs gund kassar huglar `e sima
k`las ih tda st`p lfhm
II dfs kassar n`gputfti`hfk
n`gpkaxity fhm ahbfbas kassar
gag`ry
Eihita Igpuksa asp`hsa (EI) Iheihita Igpuksa asp`hsa (II)
at
E`uriar ]rfhse`rg Gatd`m
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
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-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
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y(h)
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Z-6
Z-6
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Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
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x(h) y(h)
x(h)
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x(h)
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y(h)
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y(h)
y(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Fs wa n`ukm saa tdft fkk imafk ei ktars tfca tda sdfpa `e f bfta euhnti`h ih
eraquahny m`gfih tdarae`ra tday fra sfgpkihb euhnti`h ih t iga m`gfih (er`g
E`uriar trfhse`rg) ]da igpuksa rasp`hsa dahna is f sfgpk ihb euhnti`h fhm is
II ih hftura II gfcas tda trfhsear euhnti`h h`h nfusfk tdarae`ra e`kk`wihb
staps fra tfcah t` gfca tda igpuksa rasp`hsa fhm trfhsear euhnti`h nfusfk
6
1
=
gt
ltImafk ei ktar
]rfhsear Euhnti`h
Iheihita Igpuksa
asp`hsa (H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(H`h-Nfusfk)
Eihita Igpuksa asp`hsa
(Nfusfk)
Masibham ei ktar
]rfhsear Euhnti`h
Nurraht tiga h7
at
Er`g E`uriar trfhse`rg `e bfta euhnti`hs fhm sulsaquaht truhnfti`h `e igpuksa
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
Ϗ
ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
Ϗ
∣
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
ύ
ω ω
≭ ≭
Υ7 7 7
Υ7 7 7
Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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I I
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x(h) y(h)
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Z-6
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s(h) 6 h7 paraGltGhellip
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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i
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+ z A (z )
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gftrixraprasahtfti`h
A (z )
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^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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rasp`hsas e`kk`wihb tflka is gfma t` `ltfih igpuksa rasp`hsas `e mieearaht typa
`e eiktars
j 6( )
e`r D(z) 7 D(a )( )
pfsslfhm
st`plfhm
ω ≦
jω jωh6d(h) 7 D(a )a m
lt
Ϗ
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ω
Ϗ ∜∣
jω jωh6d( ) D( ) m
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S W
jω jωh
j -j
jω
n
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6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
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dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
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br`up makfym m
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Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
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a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
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Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
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tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
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∖ ∖ ∖ ∖
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+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
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i
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7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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S W
jω jωh
j -j
jω
n
n
6d(h) 7 D(a )a m
lt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)d(h)is rapkfnam ly d(h -ύ)
e`r axfgpka d(h) e`r k`wpfss typa ih fl`va tflka lan`gas
Ω
(h 7ύ)Ϗd(h) 7
sihΩ (h - ύ)(
(h -ύ)Ϗ
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ω
Ϗ ∜
Υ ≦
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-G (h -ύ) G)
dara is tda pdfsa makfy r br`up makfy e tda systag ia( )
m m( )
pdfsa makfy
br`up makfym m
ύ
ωύ
ύ
ω ω
ωύ
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ω ω
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Υ7 7 7
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Axfgpka 1
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
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h
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7
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w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
x(h)
x(h)
x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
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I M7I
I
M
≦
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x(h) y(h)
x(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Axfgpka 1
Nfknukfta tda eik tar n`aeeiniahts e`r f gt-tfp EI k`w-pfss eiktar witd f nut`ee
eraquahny `e 4 Dz fhm f sfgpkihb rfta `e 4 Dz usihb tda E`uriar
trfhse`rg gatd`m
sfgpka
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 62113
p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
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I I
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x(h) y(h)
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Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦Z-6
x(h) y(h)
x(h)
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y(h)
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y(h)
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Z-6
Z-6
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Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
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x(h) y(h)
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y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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_k`ttihb D(z) ih GF]KFL wa bat tda e`kk`wihb
Axfgpka 5
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
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Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
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≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
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h
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Ϗ Ϗ
ω ω
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Ϗ
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7
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w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
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≦Z-6
x(h) y(h)
x(h)
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y(h)
y(h)
y(h)
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Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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M
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x(h) y(h)
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x(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda eik tar n`aeeiniahts e`r f 62-tfp EI k`w-pfss eik tar witd f nut`ee
e raquahny `e 4 Dz fhm f sfgpk ihb rfta `e 4 Dz usihb tda E`ur iar
trfhse`rg gatd`m
62 tfp EI k`w pfss n`aeeiniahts fra nfknukftam fhm D(z) _D(z) fra pk`ttam lak`w
Axfgpka 2
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦Z-6
x(h) y(h)
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y(h)
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y(h)
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Z-6
Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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M
≦
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x(h) y(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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p
Nfknukfta tda ei ktar n`aeein iahts e`r f 1-tfp EI lfhm-pfss eik tar witd f
k`war nut`ee eraquahny `e lt Dz fhm fh uppar nut`ee e raquahny `e
lt= Dz ft f sfgpk ihb rfta `e 4 Dz
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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I M7I
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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G-6 G-6-(gG+C) -c -gG
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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i
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gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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k tti D( ) i td GF]KFL t
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
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lt lt
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fetar avfkufti`h
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Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
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Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
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RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
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wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
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asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 69113
Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 86113
Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦Z-6
x(h) y(h)
x(h)
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y(h)
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y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
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x(h) y(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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h pk`ttihb D(z) wi td GF]KFL wa bat
Rdft fra tda pr`lkags ih EI masibh witd E`uriar ]rfhse`rg Gatd`m0
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 59113
Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
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≦Z-6
x(h) y(h)
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Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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b
bull ]da pfss lfhm gfbhituma rasp`hsas fra quita lak`w mL kavak
bull]dara fra uhmasirflka rippkas ih pfss lfhm fs wakk fs st`p lfhm
bull ]dara fra t`` gfhy sima k`las wd`sa gfbhitumas fra n`gpfrflka t` gfih k`la
wdind nfh rahmar fhy eiktar ihaeeantiva
Fk k tda fl`va pr`lkags fra fttrilutam t` f pdah`gah`h nfkkam Billrsquos Aeeant `r
Billrsquos sni kkfti`hs ]dasa sni kkfti`hs `nnur mua t` tda flrupt truhnfti`h `e
igpuksa rasp`hsa wdind is fh ihdaraht pr`lkag `e EI masibh
Rdft is tda ^`kuti`h0
F wihm`w euhnti`h wdind is syggatrinfk fhm nfh brfmufkky waibdt tda masibham
EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda rfhba `e G ≭ h equiv G
Rihm`w Gatd`m
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
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Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
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≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
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y(h)
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y(h)
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Z-6
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Z-M
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Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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M
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x(h) y(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Ih tdis santi`h tda wihm`w gatd`m (E`uriar trfhse`rg masibh witd wihm`w
euhnti`hs) is mavak`pam t` ragamy tda uhmasirflka Bills `snik kft i`hs ih tda pfss-
lfhm fhm st`p-lfhm `e tda masibham EI eiktar anfkk tdft Bills `snikkfti`hs
`ribihfta er`g tda flrupt truhnft i`h `e tda ihe ih ita-kahbtd n`aeeiniaht saquahna
]dah it is hfturfk t` saac f wihm`w euhnti`h wdind is syggatrinfk fhm nfhbrfmufk ky waibdt tda masibham EI n`aeeiniahts m`wh t` zar`s ft l`td ahms e`r tda
rfhba `e G ≭h equiv G Fppkyihb tda wihm`w saquahna t` tda eik tar n`aeeiniahts bivas
at
N`gpfrftiva sdfpas `e Mieearaht Rihm`ws
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
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7
∽ ≯
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w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
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x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
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x(h) y(h)
x(h)
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x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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p p
^taps ih Rihm`w Masibh
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
≦
≦
≦Z-6
x(h) y(h)
x(h)
x(h)
x(h)
x(h)
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x(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
y(h)
Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
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x(h) y(h)
x(h)
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y(h)
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y(h)
y(h)
M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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^taps ih Rihm`w Masibh
Axfgpka 4
Masibh f 1-tfp EI lfhm rajant ei ktar witd f k`war nut`e e e raquahny `e lt Dz fh
uppar nut`ee eraquahny `e lt= Dz fhm f sfgpkihb rfta `e 4 Dz usihb tdaDfggihb wihm`w gatd`m
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
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6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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7222019 Digital Filter Design-DSP
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s(h) 6 h7 paraGltGhellip
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y(h)IlIfI7 If Il
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
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G-6 G-6-(gG+C) -c -gG
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` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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i
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+ z A (z )
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gftrixraprasahtfti`h
A (z )
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D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
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Fetar nfk
h
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w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦Z-6
x(h) y(h)
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y(h)
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y(h)
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Z-6
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Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
I
M
≦
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Axfgpka 46
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
Ϗ
Ϗ
∜ ∜
7
∽ ≯
∣ ∣
w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
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≦
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≦Z-6
x(h) y(h)
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Z-6
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7222019 Digital Filter Design-DSP
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I M7I
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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F k`w pfss eiktar is t` la mas ibham witd e`kk`wihb masiram e raquahny rasp`hsa j -jlt
jωa 7 a (- = =)
e`r D(z) 7 D(a ) ( = )
ω
Ϗ ω Ϗ
Ϗ ω Ϗ
Υ ≭ ≭ ≦
≭ ≭
Matargiha tda eiktar n`aeeiniahts d(h) ie w ihm`w euhnt i`h is maeiham fs
6 ( h =)(h) 7
`tdarwisaω
≭ ≭
( )
=
jω jωh -jltω jωh
=
Aitdar ly avfkuftihb tda e`kk`wihb ihtabrfk r er`g tda tflkas
6 6d(h) 7 D(a )a m a a m
lt lt
= 6 7 (h 7 lt)Ϗ =
d(h) 7 (h - lt)sih
=( lt)
(h - lt)Ϗ
Fetar nfk
h
Ϗ Ϗ
Ϗ Ϗ
ω ω
Ϗ Ϗ
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w
= jω -jωh
w
h7
jω -jltω
nuktfi`h e d(h) 7 d(h) (h) er`g fl`va
tda eraquahny rasp`hsa is nfknuktam usihb e`kk`wihb axprassi`h
D(a ) 7 d(h) a
fetar avfkufti`h
6 lt 6D(a ) 7 a n`s n`s lt
=
ω
ω ω
Ϗ Ϗ
+ +
∖
Axfgpka 9
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦
≦Z-6
x(h) y(h)
x(h)
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y(h)
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y(h)
y(h)
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Z-6
Z-6
Z-6
Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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M
≦
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x(h) y(h)
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M
x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Masibh f k`w-pfss EI eiktar witd lt1 tfps usihb mdashe irwmrsquo ]da nut`ee eraquahny `e
tda eik tar is lt Dz fssugihb f sfgpk ihb eraquahny `e 4 Dz ^d`w
n`gpfrftiva eraquahny fhm pdfsa rasp`hsas `e tda eik tar usihb rantfhbukfr
Dfggihb Dfhhihb fhm Lkfncgfh Rihm`w euhnti`hs
Ritd f bivah sfgpk ihb rfta e 4 Dz tda h`rgfkizam nut`ee eraquahnynfh la e`uhm fs
H`w wa fra rafmy t` masibh EI eiktars vif tda GF]KFL pr`brfg-eirwm ]da pr`brfg
eirwm(HEtypaRhKRhDRtypa) dfs eiva ihput pfrfgatars wdind fra masnrilam fs e`kk`ws
bull mdash mdashHrsquorsquo is tda huglar `e spanie iam eik tar n`aeeiniahts (tda huglar `e e ik tar tfps)
bull mdashmdashEtyparsquorsquo mah`tas tda e ik tar typa tdft is ihput mdashmdash6rsquorsquo e`r tda k`w-pfss e ik tar masibh ihput mdashmdashltrsquorsquo e`r
tda dibd-pfss eik tar masibh ihput mdashmdashgtrsquorsquo e`r tda lfhm-pfss eik tar masibh fhm ihput mdashmdash=rsquorsquo e`r tda
lfhm rajant ei ktar masibh
bull RhKrsquorsquo fhm mdashmdashRhDrsquorsquo fra tda k`war fhm uppar nut`e e e raquahny ihputs raspant ivaky H`ta tdftRhD 7 wdah spani eyihb RhK e`r tda k`w-pfss ei ktar masibh wdi ka RhK 7 wdah spani eyihb
RhD e`r tda dibd-pfss eik tar masibh
bull mdashmdashRtyparsquorsquo spanie ias tda wihm`w mftf saquahna t` la usam ih tda masibh tdft is ihput mdashmdash6rsquorsquo e`r
tda rantfhbukfr wihm`w ihput mdashmdashltrsquorsquo e`r tda trifhbukfr wihm`w ihput mdashmdashgtrsquorsquo e`r tda Dfhhihb
wihm`w ihput mdash mdash=rsquo rsquo e`r tda Dfggihb wihm`w fhm ihput mdashmdash1rsquorsquo e`r tda Lkfncgfh
wihm`w
asukt fetar axanuti`h `e n`ma e`r axfgpka 9 sd`ws tda e`kk`wihb `utput
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
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I I
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x(h) y(h)
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Z-6
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I M7I
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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E`r f n`ggarnifk masibh nartfih agpirinfk rasukts fra hanassfry wdind fra
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
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x(h) y(h)
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Z-6
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I M7I
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s(h) 6 h7 paraGltGhellip
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
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6
-6 -(G-6)
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(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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tflukftam lak`w
Fs f ]dugl ruka
Axfgpka 6
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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x(h) y(h)
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I M7I
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s(h) 6 h7 paraGltGhellip
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
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6
-6 -(G-6)
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(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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p
Masibh f lfhm-pfss EI eiktar witd tda e`kk`wihb spanieinfti`hs
6)K`war st`p-lfhm 7 bdquo1 Dz lt)_fsslfhm 7 65bdquoltgt Dz gt)Qppar st`p-lfhm 7
gt1bdquo= Dz =)^t`plfhm fttahufti`h 7 1 mL 1)_fsslfhm rippka71 mL
5)^fgpkihb rfta 7 4 Dz
GF]KFL pr`brfg bivas tda e`kk`ihb `utput
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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x(h) y(h)
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I M7I
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s(h) 6 h7 paraGltGhellip
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
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6
-6 -(G-6)
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(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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p b b b p
Cfisar Rihm`w
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
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≦Z-6
x(h) y(h)
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Z-6
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Z-M
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Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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^` efr nd`ina `e tda wihm`w euhnti`h fhm tda vfkua `e G fra tda `hky tw` eraam`gs
tdft wa dfm e`r n`htr`kk ihb tda trfhsi ti`h lfhmwimtd ω lut tda gihigug st`p-
lfhm fttahufti`h mapahms `hky `h tda wihm`w euhnti`h wa nd``sa fhm h`t tda
vfkua `e G Cfisar wihm`w euhnti`h pr`vima n`htr`k `var l`td νs fhm tda wimtd `e
tda trfhsiti`h lfhmwimtd emptyω Fmmiti`hfk pfrfgatars ζ fhm μ pr`vima tdis
fmmiti`hfk n`htr`k ]da Cfisar wihm`w is maeiham ly
wdara I sup2 is tda g`mieiam zar`-`rmar Lassak euhnt i`h It is f p`war sarias `e tdae`rg
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
M
I
I I
I
≦
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≦
≦Z-6
x(h) y(h)
x(h)
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y(h)
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y(h)
y(h)
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Z-6
Z-6
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Z-M
Z-6M
Z-K
Z-6K
7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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x(h)
y(h)I7M
s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
M7 Mf Ml
y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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e`rg
Ra n`gputa tda vfkuas `e tda Cfisar wihm`w euhnti`h ih tdraa staps fs e`kk`ws
bull ]da pfrfgatar μ raquiram t` fndiava tda masiram fttahufti`h ζ s 7 ∜lt k`b6(ν s )
ih tda st`p-lfhm is nfknukftam er`g tda e`kk`wihb agpirinfk e`rgukf marivam ly
Cfisar (tda rippka ih tda pfss-lfhm is hafrky tda sfga fs ν s )
bull Haxt tda `rmar `e tda eiktar H (7ltG) is astigftam er`g fh`tdar agpirinfk e`rgukf
marivam ly Cfisar
bull ]da tdirm stap is t` n`gputa Ix Ih prfntina fmmihb f eihita huglar `e targs
sfy lt targs `e tda iheihita sarias bivas f sueeiniahtky fnnurfta vfkua e`r Ix
Axfgpka 66
M i EI k _ Eikt i C i i m itd m e td eikt H =1
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
httpslidepdfcomreaderfulldigital-filter-design-dsp 83113
N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
M M
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I
I I
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x(h) y(h)
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Z-6
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Z-M
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Z-K
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7222019 Digital Filter Design-DSP
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I M7I
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x(h) y(h)
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
G
6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Masibh `e tda K_ Eiktar usihb tda Cfisar wihm`w
]da kahbtd `e Cfisar wihm`w gust la `ha dibdar tdfh tda
`rmar(H7=1) `e tda EI eiktar `ltfiham er`g tda euhnti`h Cfisar`rm
l7eir6(=1 gt1 cfisar(=5 gtgt91gt))3 SdwW7eraqz(l6lt15)3
Dml7ltk`b6(fls(d))3 pk`t(wpiDgtml)3
titka(Gfbhituma `e K_ witd H7=1 fhm Cfisar wihm`w)
ykflak(Gfbhituma ih mL)
xkflak(H`rgfkizam eraquahny)
Masibh fh EI k`w _fss Eiktar usihb Cfisar wihm`w witd `rmar `e tda eiktar H7=1
witd nut`ee eraquahny ωn7gt1 rfmifhssfgpka3μ7gtgt91gt
ptigfk Eiktar Masibh
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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I I
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x(h) y(h)
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Z-6
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I M7I
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s(h) 6 h7 paraGltGhellip
`tdarwisa
MlMf
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
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6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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]da ptigfk Ei ktar masibh igpkagahts _frcs-GnNkak kfh fkb`ri tdg ]dis is lfsam
`h gihigizihb tda gfxigug fppr`xigfti`h arr`r ih f Ndalysdav p`kyh`gifk
Bivah fh imafk eraquahny rasp`hsa Dm(a jω]) tda fppr`xigfti`h arr`r A(ω) is
maeiham fs
wdara D(a jω]) is tda eraquahny rasp`hsa `e tda kihafr pdfsa EI eiktar t` la
masibham fhm R(ω) is tda waibdt euhnti`h e`r agpdfsizihb nartfih eraquahny
lfhms `var `tdars murihb tda `ptigizfti`h pr`nass ]dis pr`nass is masibham t`
gihigiza tda arr`r sd`wh fl`va ]da eibura lak`w eurtdar nkfrieias tda n`hnapt
fhm sd`ws tda mie earaht h`tft i`h usam ih tda masibh pr`nass
Gfbhituma asp`hsa `e f _rfntinfk(Ndalysdav)
K`w-pfss fhm imafk K`w pfss n`gpfram
Arr`r latwaah imafk fhm prfntinfk asp`hsa
Raibdtam arr`r is fks` sd`wh
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
Ϗ
Ϗ
ωύ
ω
Ϗ ∜
Υ ≦
∣
7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
M
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x(h) y(h)
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I M7I
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y(h)IlIfI7 If Il
x(h)
Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
G
i
G
`
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6
-6 -(G-6)
G
(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
rasp`hsa n`he`rgs witd tda `ptigizfti`h raquiragahts
]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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_frfkkak E`rg
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7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
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7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
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7222019 Digital Filter Design-DSP
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Axfgpka 6lt
Masibh f k`w-pfss ei ktar witd tda e`kk`wihb spanieinfti`hs
M^_ systag sfgpkihb rfta 7 4 Dz3 _fss-lfhm 7 bdquo4 Dz3 ^t`p-lfhm 76bdquo
= Dz3 _fss-lfhm rippka 7 6 mL3 ^t`p-lfhm fttahufti`h 7 = mL3 Eiktar `rmar 71gt
]dah fppkyihb Aqufti`h stftam fl`va bivas
7222019 Digital Filter Design-DSP
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Fpfrt er`g tda pk`t tda eiktar n`aeein iahts tdus avfkuftam fra fks` tflukftam ih tda
haxt tflka ]da gfbhituma fhm pdfsa rasp`hsas fra fks` pk`ttam nartfihky tda eik tar
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]da Gftkfl pr`brfg e`r axfgpka 6lt is writ tah lak`w3
EI eiktar n`aeeiniahts ih Axfgpka 6lt
7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
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= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
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7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
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7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
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lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
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7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
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wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
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ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
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7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
7222019 Digital Filter Design-DSP
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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GQK]I-F]A
MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
]da pr`nass `e ramunihb f sfgpkihb rfta ly fh ihtabar efnt`r is raearram t` fs
m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
mdashmdashman igfti`hrsquorsquo(h`t tfcihb `ha `e tah) ]da targ mdashmdashmanigfti`hrsquorsquo usam e`r tda m`wh
sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
^fgpkihb rfta `e f sibhfk nfh la ndfhbam usihb tda fl`va kihafr eik tar
-j ja 7 a iωύ Υ
id(h -ύ )
jω jωh
j -j
jω
6d(h) 7 D(a )a mlt
a 7 a (pfsslfhm)e`r D(z) 7 D(a )
(st`plfhm)
d(h)is rapkfnamlyd(h -ύ)
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7222019 Digital Filter Design-DSP
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Manigfti`h ly f efnt`r M
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]da aeeant `h spantrug lae`ra fhm fetar manigfti`h
7222019 Digital Filter Design-DSP
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Ihtarp`kfti`h ly f efnt`r I
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^ibhfk Ek`w Brfpds fhm Lk`nc mifbrfg aprasahtfti`h
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Guktistfba Igpkagahtfti`hs
7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
7222019 Digital Filter Design-DSP
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
-G -ltG -gtG
-6 -G -ltG -gtG
-lt -G
tdafl`va axprassi hnfh la man`gp`sam iht`
D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
+ z d(6)+d(G+6)z +d(ltG+6)z +d(gtG+6)z +
+ z d(lt)+d(G+lt)z +
∘ ∘
∖ ∖ ∖ ∖
-ltG -gtG
-(G-6) -G -ltG
G-6 G-6-(gG+C) -c -gG
c7 g7 c7 g7
G -6 G -lt G
` 6 lt
d(ltG+ lt)z +d(gtG+ lt)z +
+ z d(G-6)+d(ltG-6)z +d(gtG-6)z +d(=G-6)+
n`hmahsihb tda fl`va aqufti`h iht`
D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
-(G-6) G
(G-6)
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-6 -(G-6)
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(G-6)
+ z A (z )
Rdara A (z ) 7D(z) e`r c 7 i 7 6ltG-6
gftrixraprasahtfti`h
A (z )
A (z )
D(z) 7 6z z
A (z )
^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
7222019 Digital Filter Design-DSP
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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Eraquahny ^fgpkihb Gatd`m
6 Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
7222019 Digital Filter Design-DSP
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6Ih tdis gatd`m masiram gfbhitumas `e tda eraquahny rasp`hsa is mirantky
gahti`ham ft eraquahny p`ihts matargiham er`g h` `e tfps raquiram ih tda
masibh
lt]` tda mirantky spanie iam gfbhitumas ih eraquahny m`gfih IME] is fppk iam t` battda n`rrasp`hmihb igpuksa rasp`hsa
gt]da igpuksa rasp`hsa pr`vimas tda raquiram n`aeeiniahts `e tda trfhsear
euhnti`hs viz ll6helliplH-6
= ]da trfhsear euhnti`h is e ihfk ky pk`ttam fbfihst eraquahny
ll6helliplH-6D(z) 7 l+l6z-6+lH-6z
-(H-6)Masibham Eiktar
Imafk Ndfrfntaristins^fgpkam gfbhitumas spanieiam
er`g h` `e tfps Eihita Igpuksa
asp`hsaIME]
at
]da _r`namura is suggfrizam lak`w
7222019 Digital Filter Design-DSP
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6 Bivah tda eiktar kahbtd `e ltG + 6 spani ey tda gfbhituma eraquahny rasp`hsa e`r
tda h`rgfkizam eraquahny rfhba er`g t` Ϗ
lt Nfknukfta EI eiktar n`aeeiniahts
gt Qsa tda syggatry (kihafr pdfsa raquiragaht) t` matargiha tda rast `e tda
n`aeeiniahts
= ltfih tda trfhsear euhnti`h n`aeeiniahts viz ll6helliplH-6 er`g igpuksa rasp`hsa
fhm n`gpkata tda masibh
Axfgpka 66
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e eraquahny `e U 7
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd 2 tfps fhm f nut`e e e raquahny `e Un 7
gtϏ rfmifhsfgpka usihb tda eraquahny sfgpkihb gatd`m
7222019 Digital Filter Design-DSP
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Billrsquos snikkfti`hs ihtr`munas rippkas
Axfgpka 6lt
Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
7222019 Digital Filter Design-DSP
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg II rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
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Masibh f kihafr pdfsa k`w-pfss EI eiktar witd lt1 n`aeeiniahts usihb tda eraquahny
sfgpkihb gatd`m Kat tda nut`ee eraquahny la lt Dz fhm fssuga f sfgpk ihb
eraquahny `e 4 Dz
]da gfbhituma eraquahny rasp`hsa pk`ttam usihb tda mfsd-m`ttam kiha ismispkfyam ih tda upn`gihb eibura wdara i t is `lsarvam tdft `snikkfti`hs (sd`wh
fs tda mfsd-m`ttam k iha) `nnur ih tda pfss-lfhm fhm st`p-lfhm `e tda masibham
EI eiktar ]dis is mua t` tda flrupt ndfhba `e tda spanieinfti`h ih tda trfhsiti`h
lfhm (latwaah tda pfss-lfhm fhm tda st`p-lfhm) ]` ramuna tdis rippka ae eant
tda g`mieiam spanieinfti`h witd f sg``td trfhsiti`h lfhm Dc c 7 6 6gt is
usam
]` efniki tfta afsy n`gputfti`h fh`tdar GF]KFL euhnti`h mdash eires rsquo is writtah e`r
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
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]da mie earahna aqufti`hs fra tdus
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ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
7222019 Digital Filter Design-DSP
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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Axfgpka -6gtBivah f san`hm-`rmar trfhsear euhnti`h
_are`rg tda eik tar rafkizfti`hs fhm writa tda mieearahna aqufti`hs usihb tda
e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
]da mie earahna aqufti`hs e`r tda mirant-e`rg II rafkizfti`h fra axprassam fs
7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
Nfsnfma E`rg
Ih `rmar t` yiakm tda pfrfkkak e`rg `e rafkizfti`h wa haam t` gfca usa `e tda pfrtifkerfnti`h axpfhsi`h fhm wikk ei rst kat
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
7222019 Digital Filter Design-DSP
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MIBI]FK ^IBHFK _NA^^IHB
GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
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m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
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sfgpkihb pr`nass dfs laah fnnaptam fhm usam ih gfhy taxtl``cs fhm eiakms
M`wh sfgpkihb f mftf saquahna x(h) is usufkky m`ha ly fh ihtabar efnt`r `e
M(manigfti`h)^igikfrky ihnrafsihb tda sfgpkihb rfta is up sfgpkihb `r mdashihtarp`kfti`hrsquo `e x(h) ly f ihtabar efnt`r I(ihtarp`kfti`h)
7222019 Digital Filter Design-DSP
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Kihafr Eiktar ndfrfntaristins
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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Guktistfba Ihtarp`kft`rs
Guktistfba Manigft`rs
ippka fhm EI eik tar kahbtd(G) rakfti`h
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_`kypdfsa Man`gp`sit i`h `e Eiktar trunturas∘
∖ -h -6 -lt -gtD(z) 7 d(h)z 7 d()+d(6)z +d(lt)z +d(gt)z +
7222019 Digital Filter Design-DSP
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h7
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D(z) 7 d()+d(G)z +d(ltG)z +d(gtG)z +
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D(z) 7 d(gG+c)z 7 z d(gG+c)z
7A (z )+ z A (z )+ z A (z )+
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gftrixraprasahtfti`h
A (z )
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D(z) 7 6z z
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^trunturfk Lk`nc aprasahtfti`h
7222019 Digital Filter Design-DSP
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Mirant e`rg
_`kypdfsa e`rg
7222019 Digital Filter Design-DSP
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^truntura N`gpfris`h
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E`km Mirant e`rg gt E`km _`kypdfsa e`rg
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]DI^ AHM^ ]DA ^]QMY
H MIBI]FK EIK]A
MA^IBH
Fttahufti`h rfta
7222019 Digital Filter Design-DSP
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]dis aqufti`h `e strfibdt kiha witd s k`pa -ltcmLmanfma
A]
7222019 Digital Filter Design-DSP
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eraquahny sfgpkihb gatd`m masibh E`kk`wihb fra tda spanieinfti`hs
Ra wikk usa tdarsquo e ires rsquo euhnti`h t` masibh tda e ik tar `e axfgpka 6lt dara tda pr`brfg
s writ tah wdind avfkuftas tda masibh witd fh flrupt gfbhi tuma spanie inft i`h fhm
fh`tdar witd sg``td gfbhituma spanie infti`hs s` tdft Bills pdah`gah`h nfh la
afsiky varieiam
Brfpd `ltfiham er`g GF]KFL pr`brfg is bivah lak`w
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EIK]A AFKIZF]IH
Mirant-E`rg I afkizfti`h
7222019 Digital Filter Design-DSP
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Fs wa ch`w f mibitfk e iktar trfhsear euhnti`h D(z) is bivah ly
Kat x(h) fhm y(h) la tda mibi tfk eik tar ihput fhm `utput raspantivaky Ra nfh axprass
tda rakfti`hsdip ih z-trfhse`rg m`gfih fs
Y(z) 7 D(z)T(z)
wdara T(z) fhm Y(z) fra tda z-trfhse`rgs `e x(h) fhm y(h) raspantivaky Ie wa
^ulstituta fl`va Aqufti`h iht` D(z) ih prasaht aqufti`h wa dfva
]fcihb ihvarsa Z trfhse`rgs
]dis mieearahna aqufti`h tdus nfh la igpkagahtam ly f mirant-e`rg I rafkizfti`hsd`wh ih Eibura(F) pfrt (L) pfrt ik kustrftas tda rafkizfti`h `e tda san`hm-`rmar II
eik t (G H lt) H t td t td t ti m i Ei (N) t
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eik tar (G 7 H 7 lt) H`ta tdft tda h`tfti`h usam ih Eiburas(N) pfrt
Mirant-E`rg II afkizfti`h
7222019 Digital Filter Design-DSP
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N`hsimarihb Aqufti`hs ih pranamihb pfrfbrfpd witd H 7 G wa nfh axprass
Rdara
]dah wa bat
]da mie earahna aqufti`hs fra tdus
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ei ktar (G 7 H 7 lt)
7222019 Digital Filter Design-DSP
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ei ktar (G 7 H 7 lt)
Nfsnfma (^arias) afkizfti`h
Fh fktarhfta wfy t` e iktar rafkizfti`h is t` nfsnfma tda efnt`rizam D(z) ih tdae`kk`wihb e`rg
D(z) 7 D6(z)Dlt(z)hellipDc(z)
wdara Dc(z) is nd`sah t` la tda eirst- `r san`hm-`rmar trfhsear euhnti`h (santi`h)
wdind is maeiham ly
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E`r Axfgpka
_frfkkak afkizfti`hH`w wa n`hvart D(z) iht` tda e`kk`wihb e`rg
7222019 Digital Filter Design-DSP
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e`kk`wihb rafkizfti`hs6 mirant e`rg I fhm mirant e`rg II
lt nfsnfma e`rg vif tda eirs t-`rmar santi`hs
gt pfrfkkak e`rg vif tda eirst-`rmar santi`hs
7222019 Digital Filter Design-DSP
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Mirant e`rg I Mirant e`rg I
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7222019 Digital Filter Design-DSP
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]` fndiava tda nfsnfma (sarias) e`rg rafkizfti`h wa efnt`r D(z) iht` tw` eirst -`rmar
santi`hs t` yiakm
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Qsihb Mirant e`rg II t` baharfta mieearahna aqufti`hs e`r afnd santi`h
7222019 Digital Filter Design-DSP
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_frfkkak E`rg
Axfgpka 6=Qsa GF]KFL t` rafkiza tda e`kk`wihb trfhsear euhnt i`h ih Mirant E`rg-II
7222019 Digital Filter Design-DSP
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Mirant E`rg-II rafkizfti`h `e D(z) usihb GF]KFL ^igukihc
Ihput amp utput ^ibhfks `e tda ^ystag er`g ^n`pa
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GQK]I-F]A M^_
7222019 Digital Filter Design-DSP
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Ih gfhy frafs `e mibitfk sibhfk pr`nassihb (M^_) fppkinfti`hsrdquosund fs
n`gguhinfti`hs spaand fhm fumi` pr`nassihbrdquorisihb `r k`warihb `e f sfgpkihbrfta is raquiram ]da prihnipka tdft mafks witd ndfhbihb tda sfgpkihb rfta lak`hbs
assahtifk ky t` guktirfta sibhfk pr`nassihb (Ieafnd`r fhm Jarvis ltlt3 _`rft69923
_r`fcis fhm Gfh`kfcis 69953 ^`rahsah fhm Ndah 6992) Fs fh ihtr`munti`h wa
wikk e`nus `h sfgpkihb rfta n`hvarsi`h3 tdft is sfgpkihb rfta ramunti`h `r
ihnrafsa
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m`wh sfgpkihb `e f mftf saquahna Ra fks` raear t` m`wh sfgpkihb fs
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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7222019 Digital Filter Design-DSP
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