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In Phase Modulation the phase of carrier signal is varied.

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In Phase Modulation the phase of carrier signal is varied.

(a) True

(b) False

I got this question in examination.

The above asked question is from Carrier Acquistion Techniques in DSB-SC topic in portion Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct option is (a) True

For explanation I would say: In phase modulation, the phase shift of carrier wave is varied with respect to the instantaneous amplitude of modulating signal. The general PM modulated expression is:

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

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