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ADPCM (adaptive differential pulse code modulation) - GovITwiki

ADPCM (adaptive differential pulse code modulation)

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A speech-coding method that calculates the difference between two consecutivespeech samples in st andard pulse code modulation (PCM) coded telecommunicationsvoice signals. This calculation is encoded using an adaptive filter and; as a result;allows analog voice signals to be carried on a 32 Kbps digital channel in half thespace PCM uses.

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