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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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