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How to know whether equation describes a FM or PM signal?

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johnchau123

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Suppose I was given the following equation

fc(t) = 10cos[(10^8)*pi*t + 3*sin(2*10^3)*pi*t]

How can I determine whether it is AM or PM?

Thanks :)
John
 

FM or PM?

u have to ask what is the modulating signal,but i guess u should consider it the 3*sin(2*10^3*pi*t) which means the it is phase modulation
 

Re: FM or PM?

johnchau123 said:
Suppose I was given the following equation

fc(t) = 10cos[(10^8)*pi*t + 3*sin(2*10^3)*pi*t]

How can I determine whether it is AM or PM?

Thanks :)
John
Click to expand...
from the title FM or PM???
hahahha...
hmmm....yha i think its PM
 

FM or PM?

Hi johnchau123,

you need to know what is the modulating signal.
A modulated signal A*cos[2*pi*f*t+phi(t)] is a PM modulation with phi(t) as modulating signal, or FM with 1/(2*pi)*d(phi)/dt as modulating signal.
Regards

Z
 

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