Adaptive differential pulse-code modulation

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What Wikipedia says

Adaptive differential pulse-code modulation (ADPCM) is a variant of differential pulse-code modulation (DPCM) that varies the size of the quantization step, to allow further reduction of the required data bandwidth for a given signal-to-noise ratio.

Excerpt from the Wikipedia article “Adaptive differential pulse-code modulation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia