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For demodulation of PCM, it is first converted into ________

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For demodulation of PCM, it is first converted into ________

(a) PAM

(b) PWM

(c) PPM

(d) FM

I had been asked this question in a job interview.

I would like to ask this question from Generation of VSB topic in section SSB Modulation of Analog Communications

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Correct option is (a) PAM

To explain I would say: Pulse Code Modulation deals with converting an analog signal to a digital signal. During it’s demodulation, the wave to be treated is to be parallel. The series pulse wave signal is then converted into a parallel digital signal using a serial to parallel converter, after which it is further converted into the original analog signal with the help of a decoder or detector.

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