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What are the main uses of DPCM?

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What are the main uses of DPCM?

(a) Speech Decoding and Transmission over mobiles

(b) Speech Encoding and Transmission over mobiles

(c) Speech Decoding and Transmission over telephone channels

(d) Speech Encoding and Transmission over telephone channels

I got this question in semester exam.

Origin of the question is Oversampling A/D Converters topic in chapter Sampling and Reconstruction of Signals of Digital Signal Processing

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Correct choice is (d) Speech Encoding and Transmission over telephone channels

The best explanation: A differential predictive signal quantizer system. This system is used in speech encoding and transmission over telephone channels and is known as differential pulse code modulation (DPCM ).

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