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DPCM

Differential Pulse Code Modulation (DPCM)

Complete Definition

DPCM is and advanced form of PCM.

Differential (or Delta) pulse-code modulation (DPCM) encodes the PCM values as  differences between the current and  the previous value. For audio this type of  encoding reduces the number of bits  required per sample by about 25% compared  to PCM. Predict  the next sample based on the last  few decoded samples.

Wikipedia  Definition of  Delta Modulation

Wikipedia  Definition of DPCM

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