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Module 5: Pulse Modulation-II

20242m

Which of the following techniques is used to reduce noise in PCM?
(i) Companding
(ii) Differential PCM
(iii) Delta Modulation
(iv) FDM

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Answer

Correct Option: (i) Companding

Explanation

Companding (μ\mu-law/A-law compress-expand) non-uniform quantization: small amplitudes fine steps, large coarse. Reduces quantization noise for small signals, improves SQNR vs uniform PCM. Differential PCM and Delta Modulation also reduce but companding is standard for PCM noise reduction.

Final Answer

Companding → Option (i).

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