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What is the expansion of DPCM?

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What is the expansion of DPCM?

(a) Differential Pulse Code Modulation

(b) Differential Plus Code Modulation

(c) Different Pulse Code Modulation

(d) None of the mentioned

I got this question during an online interview.

The query is from Oversampling A/D Converters in division Sampling and Reconstruction of Signals of Digital Signal Processing

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Right option is (a) Differential Pulse Code Modulation

To elaborate: 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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