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by Dinesh Thakur

Adaptive Pulse Code Modulation (ADPCM): A class of algorithms used for compressing "digital audio data, which work by storing the differences between one SAMPLE and the next: for example with 16-bit samples, only a 4-bit difference might be stored, thus achieving 4:1 compression ratio. The popular WAV sound file format employs variants of the ADPCM scheme.