DIGICOMMS3

8/20/2019 DIGICOMMS3

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De La Salle University – Dasmariñas

College of Engineering, Architecture and Technology

Electronics Engineering

ECET422La – DIGITAL COMMUNICATIONS LABORATORY

Exeriment !o" #

Pulse Code Modulation

Su$mitted $y%

&riones, 'aimecah ("

e!"ua"# $%& 2$'(

En)"* +oel C* Delos An)eles

)nstructor


2/15

DE LA SALLE U!)*E+S)T – DAS-A+)!AS

Dasmarinas, Cavite

C.LLE/E .0 E!/)!EE+)!/, A+C1)TECTU+E A!D TEC1!.L./

ELECTRONICS ENGINEERING

!ame% &riones, 'aimecah (" Date% 0e$ruary 23, 4256 "

Course7ear 8 Section% ECE95 +ating% "

Exeriment !o"#Pulse Code Modulation

OB+ECTI,ES-

This exeriment :ill ena$le the students to investigate on ;uanti55 (C- modulator >#?"5255 (C- demodulator >#?"5555 0unction generator 2@422 1< >4?"365 0re;uency counter 2752-h< >4?"33

Additionally required:5 (o:er Suly 56*, #A >4?"B?5 Digital Storage oscilloscoe 6#5 4345 52 $ridging lugs, $lac 625 6554 Ca$le airs, $lac 522cm 625 9?55 (ro$e 5o-h6 4#5

Additionally recommended:5 CASS interface5 -easuring and evaluating 649 5555 recorder 6>6 ??#


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PROCEDURE-

5" Use the exeriment set7u according to 0ig" Ex6"475"

4" &y ressing the -.DE $utton several times s:itch to the oerating mode% (C-,

linear ;uanti


4/15

Dislay the curve of U4 versus U5 as a ;uanti


5/15

4" 0ollo: the re;uired settings of (A-, (C-, and oscilloscoe"

#" 0eed the DC voltage of the (C- modulator into the lo: ass inut filter C15 of

the (A- modulator" Dislay the outut signal of the (C- modulator"

9" *ary the DC voltage"

6" Set a DC voltage of 6"6*" Setch the signal curve of the (C- outut signal in

Diagram 6"#75"

?" Determine the rate of information transmission C for f I 52 1


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DATA AND RESULTS-

5.2 Experiment on quantization and binary encoding ". #inear $uantization

Ta!le (*2.'- Linea" /uanti0ation 1a"a1te"isti1U5* U4* Code

73"6 73"? 25555552

73 73 25552552

7B 7B 25525225

7> 7> 25255255

7? 7? 25225555

76 76 25222255

79 79 22552522

7# 7# 22522552

74 74 22255225

75 75 222255222 2 52222225

5 5 52225255

4 4 52255555

# # 52522525

9 9 52552255

6 6 55222252

? ? 55225552

> > 55255255

B B 55522555

3 3 55552525

3"6 3"6 55555522

2. %on&#inear

quantizationa' Compre!!or characteri!tic!

$G13 Ta!le (*2.- Non.

Linea" 5uanti0ationCo67"esso"

Ca"a1te"isti1

dG U5*

eG U4*

fG 7

3"

gG 7

>

6

hG 73 iG 73"?

JG 7B G 73"9

lG 7> mG 73

Dia)"a6 (*2.'- Linea" 5uanti0ationCa"a1te"isti1 ( !it

Dia)"a6 (*2.'- Linea" 5uanti0ationCa"a1te"isti1 8 !itTa!le (*2.2- Si0e o9 te /uanti0ation inte":al

U5* U47U5 I KUm*

73"6 73"?3"6 I 2"5

73 733 I 2

7B 7BB I 2

2 272 I 2

5 575 I 2

4 474 I 2


7/15

nG 7? oG 7B"B

G 76 ;G 7

B"?

rG 79 sG 7B"5

tG 7# uG 7>"?

vG 74 :G 7?"B

xG 75 yG 76"#

afG # agG>"?

ahG9 aiG B"5

aJG 6 aGB"?

alG ? amGB"B

anG> aoG3

aGB a;G3"4

arG 3 asG3"

?

atG 3"6

auG3">

avGa('

ax'Expander

Characteri!tic!

ay) Ta!le (*2.4- Non.Linea" 5uanti0ation

E;7ande" Ca"a1te"isti1

a3a;3 a#3

a03 !a3 !!3 !13 !d3 !e3 !93 !)3!3 !i3

!3 1;3

1#3 103 da3 d!3 d13 dd3 de3 d93 d)3 d3

di3 d3e;3 e#3 e03 9a3 9!3 913 9d3 9e3 993

9)3 93 9i3 9


8/15

6

$G7# $;G72"#

$rG 74 $sG72"4

$tG 75 $uG72"5

$vG2 $:G2

$x 5 $ 2

"4

$


9/15

"9

cJG > cG 4"4


10/15

clG B cmG#"B

cnG3 coG?"?

cG3"6

c;GB"9

crG


11/15

c' %on&linear tran!mi!!ion Characteri!tic!csG

1t3 Ta!le (*2.(- Non.Linea" T"ans6issionCa"a1te"isti1

cuGU5

*

cvG U

4*

c:G 73"6

cxG 73"9

cyG 73 c"B

dcG 7> ddG7?"

3deG7? dfG 7?

dgG76 dhG76

diG 79 dJG 79

dG 7# dlG 7#

dmG 74

dnG74

doG75 dG75

d;G2 drG 2

dsG5 dtG 5

duG4 dvG4

d:G # dxG#

dyG9 d efG >

egGB ehG>"3

eiG 3 eJG 3

eG3"6 elG 3"?

emGen'eoG

eG

e;G

er'

e!'

et'

ga) Dia)"a6 (*2.(- Non.Linea"

T"ans6ission

Ca"a1te"isti1 ( !it

)!3 )13 )d3 )e3 )93 ))3 )3 )i3 )3;3 #3

03 ia3 i!3 i13 id3 ie3 i93 i)3 i3 ii3

i

8 !it

3=;3 =#3 =03 la3 l!3

l13 ld3 le3 l93 l)3 l3 li3 l36;36#3603


12/15

eu'e,'e('ex'ey'

ez')a'

d' agnitude! o) $uantization inter,al!)b'

fcG Ta!le (*2.?- Te 6a)nitudes o9 te/uanti0ation inte":als

fdG )nterval feGU

ffGU

fgGKU

fhG 752*@7

6*

fiG7

fJG7

fGB2

flG 76*@74"6*

fmG7

fnG7

foG62

fG 74"6*"""75"46*

f;G7

frG7

fsG52

ftG 75"46*

@72"?46*

fuG7

fvG7

f:G2

fxG 72"?46*

@72"#54*

fyG7

f


13/15

gvG5"6*"""4"6*

g:G4

gxG5

gyG7

gitloss o9 7a"it# !it

n!3 n13 nd3 ne3 n93 n)3 n3 ni3 n3 o;3 o#3

o03 7a3 7!3 713 7d3 7e3 793 7)3 73 7i37


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63

n3 DISCUSSIONS AND OBSER,ATIONS-

hoG This exeriment, entitled (ulse Code -odulationM, aims to study on

;uanti


15/15

a method of converting an analog signal into a digital signal and can $e done $y

samling and ;uanti

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DIGICOMMS3