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Which of the following is not a part of analogue communication?

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Which of the following is not a part of analogue communication?

(a) PPM

(b) AM

(c) PCM

(d) PWM

This question was addressed to me in unit test.

My enquiry is from Generation of VSB topic in portion SSB Modulation of Analog Communications

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The correct choice is (c) PCM

The explanation: Pulse code modulation (PCM) is a digital form of communication. It has no relation with analog communication. Pulse Code Modulation is a technique in which the amplitude of an analogue signal is converted to a binary value represented as a series of pulses.

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