Method and apparatus for low-delay CELP speech coding and decodi

Details Method and apparatus for low-delay CELP speech coding and decodi Method and apparatus for low-delay CELP speech coding and decodi

1993-05-03

1997-07-22

Knepper, David D.

395 228, 395 216, G10L 914

Patent

active

056510918

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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