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てきおうてきさぶんふごうへんちょう 適応的差分パルス符号変調
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Noun
1. adaptive differential pulse-code modulation; adaptive DPCM; ADPCM​Computing
Wikipedia definition
2. 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 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 in the early 1970s at Bell Labs for voice coding, by P. Cummiskey, N. S.
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