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VoCoSysWireless communication System

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Introduction

Wireless System

System using radio-frequency, infrared, microwave

in place of wires, cables, or fiber optics to transmit signals

or data. Wireless communication

transfer of information between two or more points

not connected by an electrical conductor.

VoCoSys is digital communication solution for halfduplex voice communication.

Uses Digital filter approach to suppress noise

Uses A!" encryption for security

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BlockDiagram

Speaker Amplifer

Microphone

LPC!"#

MC$

%" &'(WirelessModule

Antenna

Le)elShi*ter

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Hardware Components

LPC2148 MCU

NRF24L01+

Level Sh!ter"#L081$ %&do %mpl'er

"LM(8)$

Condenser M*

Spea,ers

Power Mod&le

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'ard+are Description

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Microcontroller, LPC!"#

%RM-#.M/ %RM erson 4

/deal !or dtal 'lter appl*aton 3e*a&seo!

M%C "M&ltpl and %**&m&late $ nstr&*tons

10 3t analo to dtal *onverters "%.C$

5ne 10 3t .tal to analo Converter

".%C$ S&pports hher *lo*, speed "&pto )0

MH6$

Can swt*h !rom * prorammn to

assem3l

i l d l

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Wireless Module,n-."L/!0

247H6 /SM 3and operaton

7FS mod&laton

Con'&ra3le on9ar data rate o! 1M3ps

or 2M3ps %&tomat* pa*,et assem3l "Pream3le:

%ddress: CRC$

%&tomat* pa*,ed dete*ton andvaldaton

.nam* paload lenth: 1 to (2;tes

%&to retransmt

%&to %*,nowledment wth optonal

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Le)el Shi*ter

#L081 /C s &sed !or level sh!tn

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Audio Amplifer

LM(8) a&do ampl'er

Ade s&ppl voltae rane 412

Low D&es*ent *&rrent dran 4m% oltae ans !rom 20 to 200 "nternal

20$

7ro&nd re!eren*ed np&t

%vala3le n 8 pn MS5P pa*,ae

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Aor,n

1 i i

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1ransmissionMethodology

Input

VoiceSignal

Le)elShi*ter

ADC

Digital.ilter

Implementation

Wireless1ransmissio

n

2ncryption

10

10

11

0

10

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-eception Methodology

Wireless-eception

Digital .ilterImplementat

ion

DAC

AmpliferSpeaker

Decryption

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Ma3or Components

S%

4o% Component

5uantit

y

!

LPC2148 header 3oard wth

MCU 2

nRF24L01+ 2

6 M*rophone "Small$ 2

" #L081 /C 2

7 -4LS244 2

8 PC; 3oard 12E12E

9 Spea,er "4B small$ 2

# %RM US; Prorammer 1

: M%G2(2 2

!/ 5s*llator "20 MH$ 1

!! LC. 1)2 2

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Scope and Application

Can 3e &sed n small area*omm&n*aton !or eJample event

manaement#hs tpe o! sstem s &sed where

*omm&n*aton se*&rt s man

*on*ern Can 3e &sed where low *ost

*omm&n*aton sol&ton s reD&red

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Limitation

Hal! .&pleJ

o*e snal not

en*odedKCompressed &snC5.=CS

Short ndoor rane

Not !reD&en* adaptve

No dverst te*hnD&e s &sed

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-ecommendation

Use o! more advan*ed pro*essor"CorteJ M( KM4$ !or

F&ll .&pleJ Comm&n*aton

CompleJ =n*rpton CompleJ .tal Snal Pro*essn %lorthm

appl*atons

Usn wreless mod&le wth hher rane

FreD&en* sele*tve wreless mod&le s&*h thatthe dev*e *am 3e made *ontve

Use o! dverst te*hnD&e n wrelesstransmsson

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1hank ;ou