Narrow band frequency modulation nbfm

General Expression of FM Signal

1. Narrow Band Frequency Modulation
NBFM

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2. Nayrow band FM :-
> Depending on the valia ey Mpaslation «dex ($), FM sa Lopnidied an-

FM
Narrowband FM (NBFM) Wideband FM Cwern)
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General expression Lo Single done Fry ap que by
Sew) = A Cos[axkt + 8 Sinan ft]
Spt) = AcCopan fie Cor (Rsinan ft) — Ac Sin anit es =)

fae Neem , gs lm) For Small Valius of 4
CORB EL Cages
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3. nr 2 A. Coirft — AB Sin2r£t. smart

Gr = AtyarËt - ae Cor Eh) + eh calera

We know the expregrion of Standard An

Sat) = Actoackt + AM rar (EA + pata rar (Arme
2

Yegalon | Am 4 NP will be Some encaht 180? Phar shit at u
poet

Say u >

us A —

4. Power 9 NRFM :—

Pe= fat set Ps
2
Pe AS a MAG) page
AE Ruan gs AE ED „Er
BR
PAS ay ats

IR

(CAE 2
ne ye ES
(a E
2 +2)
— The Bandwidth and Roner Reauirmente el NBEM are amour Simular to Am
— Becaue et

Ak much Similar, with Am, NBrm 4A given Laork Practical
Signifcane o» Combarea ko WI Fr)