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    Enhancement of ADPCM Speech Coding With Backward-Adaptive Algorithms For Postfiltering and Noise Feedback

Enhancement of ADPCM Speech Coding with Backward-Adaptive Algorithms for Postfiltering and Noise Feedback

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The quality of low bit rate ADPCM speech can be enhanced by using a noise-shaping postfilter whose parameters can be derived from those of the pole-zero predictor in standard ADCPM. The speech distortion that is inevitable in postfiltering can be mitigated by adapting the degree of postfiltering to SDPCM performance.