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ADPCM


 

Adaptive Differential Pulse Code Modulation

A form of pulse code modulation (PCM) that produces a digital signal with a lower bit rate than standard PCM thus taking up less space.

ADPCM produces a lower bit rate by recording only the difference between samples and adjusting the coding scale dynamically to accommodate large and small differences. Some applications use ADPCM to digitise a voice signal so data and voice can be transmitted at the same time over digital equipment normally used only for one or the other.
 



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