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' UNL IT
Amplitude Modulation (AM)
IP. ner —
troduction ;
The main Objectiye Of a Communtator
“ype is to tyomsfer inforrration from one
place to aArothes place by Usirg Electric
SGrale.
KE An Laporma tion signal Ue Paarbamittedprer
trangmitter to ReCeLver.
« Based or the Aature of the Synal
tiomamitted Communi aben system Ls Of
two types
4: Analog Communication ~Splem
ee Digital Communit @on SYyplern
E Analog Communi Gon System :
The Message Signal Used tn thic Sypiem ic
Analog ly Mature.
t A Signal whose Amplitude Var lee Concer
aly With tespect to tive perfod % Glled
Analog Stqnab.
Exouple ; Sine wave |
Cos wane 2 Digital Communi ation
The Wess age Sty nal is used tr thic Sytem
ic digital in ature -
* A Signal tn volith the sequence of numbets
Bepsesent the Amplitude at any Tnateant OF
time te Glled digital signal. Dt is ditccrete
°
tM Nature.
N
as
We Gm t5onamitt the ~signal in four way
Novice — 30014 — 3:5 KHZ — Telephone
Audio — 208a- 20KHZ —. Radio
Video — O-— tere mka- TV
: _ (tre en depend on — Internet
Binary Data Y oe tah) i Block di wiam
——
f
\
COM YPUR obion apie
—
( Voapel | : ¥ 1
: : 110m, chan
“Wronneties mtte gy ae
Desi ation’ Ou pur
iki L | Receryor H—
Le ; Tyomnducey| a
fan Shiem
beste elements Of Communtehon Yo
Trex wrotien Souter The Syste which gore Fores
the Sour
ce Of tngpemmation tn the form OF
U ¢ i e te
ten memages Notice , audio, Nideo fe
text
: aor Modwlorten inde
“. SH = A. [I+ Ja (OS mt} cosu.t ——(G)
SW) = Ae COWL + ALAe CoLwmt Carwet
Sky = A, Cos wt +A 2 [Cos nt C08 wt
az
ee
8 Cos COLR = Cos(AtB) + Cac(a-B)
Sy) ate Cos nyt Heo [eae ee tne + Cosberde
ne ore
SH a *% Comet + Ae Cosam feta jt + Cas oe)
SH = Ay Cos wt + Pecos antle Hon )t tA Cosenlerterde
© @ @
trom the abow sqpotion , The Modulated wWaye Contedin
the Following three ‘terms
Gaviey signal woth frequeny ‘f howvirg Arwpllte
i Cas. va, Side bong (088) Akqrot —vothh Frepreny
k++.\, t : Aca
S) the ~ . meet)
Wer Aide bond (Len) Sig rol, te rypenaslt
having Amplitude (**4).
Based “Pon modulate on inde, the modulation te
Classtved tnto 3 Cie .
@) <1 shen thie Gbleg Under metdulartan
@ wel Scotter Modulation (100% oda)
3) pet => Over modulation,
from Amplitude Modulated Wave, we Gm define sont
MLM and minimum Awplitudes .
nit
Message (0s)
eb Modularivg £f4 ral
>_ Gaeier sro —_— Wee SU
- bre * tama ~!
Mom Aorpiture V A
Anis
MUR mun amplitude Ninn = AE
from sat) ra? AetAmn
= aft ‘si
Nena = elit a) 8)
|
som £4.@)
Nantn = Ac-Am A(t)
= Ac GQ-2) ©)
“foe 4,6) 9)
v V+ 5
_.
Vawin . He Q—-)
Nena!) = Vrain O39
Nerore.~ Nero = Nata BD Nwin
Virovog Nein = Doty AV enna
Nutram Nod
WAY AL (eran Vyut)
se Neng = Mek
Veo Vain me Oleme
The MOL mum, Voltoge Of Othode Foy CLC cep
deotloy: 9 ~nodulared srl on the
is he 6 divintons ond the “Mn pun
Veltage Of Cko cveen display te o
Calculate the modulation tndex.
Screen
6 VER ane
7 MO wun Volrage = lh
Mint mum ML = 06
“= = Veitn
SpE Ve,
= 6-06
or Gb 4 OG
ott
Ma FR
|
We = 0169
= 464+ |
ve
An audio Siaral Is Strom (1s00t) end
in L . |
Gyrtor Signal 16 sihan (100,000b) |
Wd sketth the Audio Signal
(i) SketCh the Grsies Sipa GD Constsuct modulated waveform
Gv) Glewate modulation tinder ond alte y
find fre quenyy of MeAboge £tq-rad ord Gariey
6 rok
Sol MO) = Ie sino Cscot)
ols) — Ws inom (100, 0008)
cb .
“ketch the Audto S%4rat
48 f= l500
ee
L Fin, 1900
= 666mee
ae B6°6 msec. . to
CG) Sketch the Cuites Sra
c&
= 100, 006
a
%
: 106 000
CD copntraee medtutores sitchen OO
*
KA. 7
