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

1991-09-10

1993-08-03

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 36, 381 31, 395 2, 375 27, G10L 500

Patent

active

052336603

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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