about nature of equation(PM or FM)

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electronics_kumar

how to differenciate pm and fm

here i have uploaded an equation ...i want know whether it belongs to FM or PM

brahma

This as such is a angle modulated signal, by seeing this we cant differentiate FM and PM, but in more general case we can write angle modulated signal as
s(t)=Acos(ωt +m(t)*h(t))

for FM, h(t) = u(t)
PM, h(t) = δ(t)

demodb

Member level 4
this belongs to PM, as the phase is varied with cos(200*Pi) with 2 the phase sensitivity.

electronics_kumar

it is mentioned as a problem in Schuam's sries meant for analog and digital communications..there it is mentioned as "it neither belongs to FM or PM"
i am perplexed...

purnapragna

for more deatailed eloboration see B.P.Lathi modern analog and communication systems.

it says that once the modulated signal is given we cannot differentiate whether it is FM or PM.

thnx

purna!

sivani_vs

Junior Member level 3
It seems to be like PM because the term 10^6t is added with a low frequency sinusoid. It seems that the phase is varrying.

zorro

Hi electronics_kumar,

What is the modulating signal?
The signal
x(t)=A*cos(wt + phi(t))
can be either PM with a modulating phi(t), or FM with modulating d(phi)/dt (the derivative of phi(t)).
Regards

Z

leoren_tm

hirs a lab questions......FMand PM equation are stated there..and how it would be generate...

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