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DPCM encodes the PCM values based on

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DPCM encodes the PCM values based on

(a) Quantization level

(b) Difference between the current and predicted value

(c) Interval between levels

(d) None of the mentioned

I had been asked this question in an online interview.

Enquiry is from Pulse Code Modulation topic in portion Formatting and Baseband Modulation of Digital Communications

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Correct option is (b) Difference between the current and predicted value

The explanation: Differential PCM encodes the PCM value based on the difference between the previous sample and the present sample value.

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