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- W1904554885 abstract "Adaptive predictive coding of speech signals at bit rates lower than 10 kbits/sec often requires the use of 2-level (1 bit) quantization of the samples of the prediction residual. Such a coarse quantization of the prediction residual can produce audible quantizing noise in the reproduced speech signal at the receiver. This paper describes a new method of quantization for improving the speech quality. The improvement is obtained by center clipping the prediction residual and by fine quantization of the high-amplitude portions of the prediction residual. The threshold of center clipping is adjusted to provide encoding of the prediction residual at a specified bit rate. This method of quantization not only improves the speech quality by accurate quantization of the prediction residual when its amplitude is large but also allows encoding of the prediction residual at bit rates below 1 bit/sample." @default.
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- W1904554885 date "2005-03-24" @default.
- W1904554885 modified "2023-09-25" @default.
- W1904554885 title "Improved quantizer for adaptive predictive coding of speech signals at low bit rates" @default.
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- W1904554885 doi "https://doi.org/10.1109/icassp.1980.1170967" @default.
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