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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) PDM

(b) PWM

(c) PPM

(d) PAM

The question was asked in unit test.

Asked question is from Frequency Domain Representation topic in division Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct choice is (d) PAM

The best I can explain: 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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