Method and apparatus for low-delay CELP speech coding and decoding
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United States of America Patent
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Aug 3, 1993
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app pub date -
Sep 10, 1991
filing date -
Sep 10, 1991
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Abstract
A low-bitrate (typically 8 kbit/s or less), low-delay digital coder and decoder based on Code Excited Linear Prediction for speech and similar signals features backward adaptive adjustment for codebook gain and short-term synthesis filter parameters and forward adaptive adjustment of long-term (pitch) synthesis filter parameters. A highly efficient, low delay pitch parameter derivation and quantization permits overall delay which is a fraction of prior coding delays for equivalent speech quality at low bitrates.
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