TRNG I HC CN THKHOA CNG NGH

B MN IN T VIN THNG

BO COTIU LUN TT NGHIP

GVHD: ThS. Trn Nht Khi Hon Sinh vin thc hin

Trn Minh Phc

M s sinh vin

1091059

GVPB: ThS. Nguyn Cao Qu

XY DNG BI TH NGHIM THU PHT AM TRN MATLAB SIMULINK

06/18/14 2

NI DUNG BO CO

1. Gii thiu ti2. C s l thuyt3. Xy dng m hnh v kt qu m phng4. Kt qu t c v kt lun5. Ti liu tham kho

06/18/14 3

1. Gii thiu ti

Mc ch chn ti

- Gii quyt vn kh khn trc mt v vic thiu thit b thc tp cc k thut iu ch.

- Gip sinh vin c th xy dng v m phng cc m hnh iu ch v gii iu ch trc nh m khng cn phi c thit b thc.

06/18/14 4

1. Gii thiu ti

Xy dng m hnhtrn Matlab Simulink

iu ch AM Gii iu ch AM

Gii hn ti

06/18/14 5

2. C s l thuyt

Cc kiu iu ch AM c bn

DSBSCAM

DSBTCAM

SSB

VSB

06/18/14 6

Hnh 1. S khi pht AM

2. C s l thuyt

06/18/14 7

Hnh 2. S khi thu AM

2. C s l thuyt

06/18/14 8

Matlab Simulink

Dng m phng Thit kcc m hnh c s

Cho ng hc cng nh cc h thng nhng nhiu lnh vc khc nhau nh:giao tip, iu khin, x l tn hiu s, x l video, hnh nh.

2. C s l thuyt

06/18/14 9

Tm hiu ti C s l thuyt

Xy dng cc m hnh sau

PhtDSBTCAM

ThuDSBTCAM

Thu phtDSBTCAM(m thanh)

ng b Bao hnh

3. Xy dng m hnh v kt qu m phng

06/18/14 10

3. Xy dng m hnh v kt qu m phng

PhtDSBTCAM

Hnh 3. S khi pht AM

06/18/14 11

3. Xy dng m hnh v kt qu m phng

M hnh pht AM c xy dng t s khi

Hnh 4. M hnh pht AM

Message S(t)

Carrier Sc(t)

A

AM signal Sm(t)

(1)

(2)

(3)

06/18/14 12

3. Xy dng m hnh v kt qu m phng

Mt s kt qu m phng

Tin tc + A (1)

Sng mang (2)

Sng AM (3)

m = 100%

A = a = 1

fc = 100kHz

fm = 10kHz

06/18/14 13

3. Xy dng m hnh v kt qu m phng

Hnh 5. Ph tn ca tin tc Hnh 6. Ph tn ca sng AM

06/18/14 14

3. Xy dng m hnh v kt qu m phng

Tch sngDSBTCAM ng b

06/18/14 15

3. Xy dng m hnh v kt qu m phng

Hnh 7. M hnh tch sng AM ng b

Message S(t)

A

Carrier Sc(t)Local

Ossillator

IF Fillter

Audio out

(1)

06/18/14 16

3. Xy dng m hnh v kt qu m phng

Mt s kt qu m phngTin tc

pht

Sng AM

Tin tcthu

Sng trung tn

Sng sau khi qua

BPF

m = 100% A = a = 1 fIF = 455kHz

fc = 950kHz fm = 10kHz fLOSC = 1405kHz

06/18/14 17

3. Xy dng m hnh v kt qu m phng

Hnh 8. Ph tn ti tn s 455kHz Hnh 9. Ph tn ti tn s 2355kHz

06/18/14 18

3. Xy dng m hnh v kt qu m phng

Tch sngDSBTCAM bao hnh

Hnh 10. S khi thu AM

06/18/14 19

3. Xy dng m hnh v kt qu m phng

Mch tch sng bao hnh

06/18/14 20

3. Xy dng m hnh v kt qu m phng

AM signal

Tch sngbao hnh

RF in IF filter

06/18/14 21

3. Xy dng m hnh v kt qu m phng

Tn hiu pht

Tn hiu thu

Sng AM

m = 66%

A =1.5 , a = 1

fm = 10kHz

fc = 950kHz

fLOSC = 1405kHz

RC = 1/10fm

R = 10 Ohm

C = 1uF

06/18/14 22

3. Xy dng m hnh v kt qu m phng

Tn hiu pht

Tn hiu thu

Sng AM

m = 66%

A =1.5 , a = 1

fm = 10kHz

fc = 950kHz

fLOSC = 1405kHz

RC

06/18/14 23

3. Xy dng m hnh v kt qu m phng

Tn hiu pht

Tn hiu thu

Sng AM

m = 66%

A =1.5 , a = 1

fm = 10kHz

fc = 950kHz

fLOSC = 1405kHz

RC >> 1/10fm

R = 100 Ohm

C = 10uF

06/18/14 24

3. Xy dng m hnh v kt qu m phng

Thu pht DSBTCAMvi tin tc l file m thanh

Hnh 11. S khi thu pht AM

06/18/14 25

3. Xy dng m hnh v kt qu m phng

Hnh 12. M hnh thu pht AM

Audio pht

Audio thu

A

Carrier

06/18/14 26

3. Xy dng m hnh v kt qu m phng

Mt s kt qu m phng

Audio pht

Audio thu

Sng AM

Sng AM thu

06/18/14 27

3. Xy dng m hnh v kt qu m phng

Hnh 13. Ph tn ca tin tc

06/18/14 28

3. Xy dng m hnh v kt qu m phng

Hnh 14. Ph tn ca sng AM

06/18/14 29

4. Kt qu t c v kt lun

- Kt qu t c:+ Xy dng thnh cng m hnh thu pht DSBTCAM.+ M phng, kho st c dng sng, ph tn, tnh cht, c

im ca iu ch bin theo kiu DSBTCAM.+ Kho st thm m hnh thu pht AM vi tin tc l file audio.+ Hon thnh bi hng dn sinh vin thc tp thu pht AM.+ Tuy nhin vn cha kho st c ht cc kiu iu ch cn

li nh: DSBSCAM, SSB, VSB.- Kt lun:+ hon thnh c mc tiu ban u t ra ca ti tiu

lun.

06/18/14 30

1. Phm Vn Tn. C s vin thng. i hc Cn Th. 2003.2. Nguyn Ha Duy Khang, Trn Nht Khi Hon, Trng Phong

Tuyn, Nguyn Thanh Tng. Gio trnh thc hnh Truyn d liu. i hc Cn Th. 2005.

3. Nguyn Nh Cng. Kho st tn hiu iu ch dng Matlab. i hc s phm k thut TP.HCM. 2000.

4. Nguyn Thanh Dun. Tm hiu v Simulink trong Matlab. i hc s phm k thut TP.HCM. 2011

5. A Wilkinson, E Tsai. Introduction to Simulink for simulating Amplitude Modulation and Demodulation. 2011.

6. A.J. Wilkinson. Signals and Systems II. Department of Electrical Engineering University of Cape Town. 2013.

7. L Xun K. Bi ging L thuyt tn hiu. Trng i hc Cng ngh Si Gn. 2009.

8. http://www.vi.wikipedia.org/wiki/MATLAB

5. Ti liu tham kho

CM N S CH LNG NGHECA THY V CC BN

TRNG I HC CN TH KHOA CNG NGH B MN IN T VIN THNGNI DUNG BO CO1. Gii thiu tiSlide 42. C s l thuytSlide 6Slide 7Slide 83. Xy dng m hnh v kt qu m phngSlide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 284. Kt qu t c v kt lun5. Ti liu tham khoSlide 31