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Adaptive differential pulse-code modulation
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<p>Adaptive differential pulse-code modulation (ADPCM) is a variant of <a href="/facts/Differential_pulse-code_modulation/v8H09k06">differential pulse-code modulation</a> (DPCM) that varies the size of the quantization step, to allow further reduction of the required data bandwidth for a given <a href="/facts/Signal-to-noise_ratio/qohClhyG">signal-to-noise ratio</a>. </p><p>Typically, the adaptation to signal statistics in ADPCM consists simply of an adaptive scale factor before quantizing the difference in the DPCM encoder. </p><p>ADPCM was developed for <a href="/facts/Speech_coding/xs5gvMXq">speech coding</a> by P. Cummiskey, <a href="/facts/Nikil_Jayant/WqT1a12L">Nikil S. Jayant</a> and <a href="/facts/James_L._Flanagan/SX7EGc37">James L. Flanagan</a> at <a href="/facts/Bell_Labs/fKP5Gk0H">Bell Labs</a> in 1973. </p>