Adaptive differential pulse-code modulation

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.

Typically, the adaptation to signal statistics in ADPCM consists simply of an adaptive scale factor before quantizing the difference in the DPCM encoder.

ADPCM was developed for speech coding by P. Cummiskey, Nikil S. Jayant and James L. Flanagan at Bell Labs in 1973.

1. ↑ Ken C. Pohlmann (2005). Principles of Digital Audio. McGraw-Hill Professional. ISBN 978-0-07-144156-8.
2. ↑ "Differences Between PCM/ADPCM Wave Files Explained". KB 89879 Revision 3.0. Microsoft Knowledge Base. 2011-09-24. Archived from the original on 2013-12-31. Retrieved 2013-12-30.
3. ↑ "},"access-date":{"wt":"2024-10-31"}},"i":0}}]}'/>"General Documentation". FFmpeg.org. Audio Codecs. Retrieved 2024-10-31.
4. ↑