Question

In FM both the frequency and amplitude of carrier signal is varied in accordance with the instantaneous value of modulating signal.

(a) True

(b) False

This question was posed to me during a job interview.

My question is based upon Representation of SSB-SC in Time & Frequency Domain in division SSB Modulation of Analog Communications

Answer 1

Correct option is (b) False

For explanation: In FM, the frequency of the carrier wave is varied with respect to the instantaneous amplitude of the message signal. The general expression for FM is as follows:

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