Low-delay audio signal coder, using analysis-by-synthesis techni

Details Low-delay audio signal coder, using analysis-by-synthesis techni Low-delay audio signal coder, using analysis-by-synthesis techni

1993-05-21

1994-06-14

MacDonald, Allen R.

395 228, G10L 914

Patent

active

053217934

ABSTRACT:
A low-delay audio signal coding system, using analysis-by-synthesis techniques, has circuitry for adapting the spectral parameters and the prediction order of synthesis filters, and of perceptual weighting filters in the order at each frame, starting from the reconstructed signal relevant to the previous frame. In the case of a CELP coder, gain controls are also provided to adapt, starting from the reconstructed sinal, a factor, bound to the average power of the input signal, of the gain by which the innovation vectors are weighted.

REFERENCES:
patent: 5233660 (1993-08-01), Chen
High-Quality 16 KB/S Speech Coding . . . by Juin-Hwey Chen published 1990 EE.
Some Experiments of 7 KHZ Audio Coding At 16 KBIT/S by Drogo de Iacovo et al., published 1989 IEEE.
Adaptive Lattice Analysis Of Speech, by J. I. Makhoul et al., published 1981 IEEE
Draft Recommendation G.72X "Coding Of Speech at 16 KBIT/S Using Low-Delay Code Excited Linear Prediction".
GSM Recommendation: 06.10 "GSM full Rate Speech Transcoding" Sept. 19, 1988.

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