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Which of the following is an example of continuous wave analog modulation?

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Which of the following is an example of continuous wave analog modulation?

(a) PCM

(b) DPCM

(c) AM

(d) ADM

The question was posed to me in an online quiz.

My question comes from Amplitude Limiting in division Receivers & Transducers of Analog Communications

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Correct choice is (c) AM

To explain I would say: Analog communication is a type in which the message to be transmitted is analog in nature. Here the message signal modulates a high frequency carrier signal. In AM, amplitude of the carrier is varied with respect to the instantaneous amplitude of the wave which is to be propagated. It is also an example of continuous wave analog modulation.

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