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FM and PM are two ways of angle modulation.

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in Analog Communications by (122k points)
FM and PM are two ways of angle modulation.

(a) True

(b) False

This question was addressed to me in semester exam.

My question comes from Frequency Discrimination Method topic in division SSB Modulation of Analog Communications

1 Answer

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Correct choice is (a) True

Easiest explanation: In angle modulation, phase or frequency of the carrier wave is varied with respect to the instantaneous amplitude of the message signal. The general expression for FM and PM are as follows:

FM (t) = Ac sin (2πfct + βsin(2πfmt)),

PM (t) = Ac sin (2πfct + βcos(2πfmt)), where symbols have their usual meaning.

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