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Module 4: Pulse Modulation-I

20242m

Which of the following is an advantage of PCM over analog modulation techniques?
(i) Requires less bandwidth
(ii) Higher noise immunity
(iii) Simpler receiver design
(iv) Lower power requirements

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Answer

Correct Option: (ii) Higher noise immunity

Explanation

PCM quantizes PAM to binary, regenerative repeaters restore levels via threshold, noise does not accumulate. Analog PAM/AM accumulates noise.

PCM requires more bandwidth (nfsn f_s) and complex codec, but SNR greatly higher (≈6n\approx6n dB). Not less bandwidth, not simpler.

Final Answer

Higher noise immunity → Option (ii).

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