System for predictive coding/decoding of a digital speech signal

Details System for predictive coding/decoding of a digital speech signal System for predictive coding/decoding of a digital speech signal

1994-01-21

1996-12-10

MacDonald, Allen R.

395 232, G10L 302

Patent

active

055839630

ABSTRACT:
A system for predictive coding of a digital speech signal with embedded codes used in any transmission system or for storing speech signals. The coded digital signal (S.sub.n) is formed by a coded speech signal and, if appropriate, by auxiliary data. A perceptual weighting filter is formed by a filter for short-term prediction of the speech signal to be coded, in order to produce a frequency distribution of the quantization noise. A circuit makes it possible to perform the subtraction from the perceptual signal of the contribution of the past excitation signal P.sup.0.sub.n to deliver an updated perceptual signal P.sub.n. A long-term prediction circuit is formed, as a closed loop, from a dictionary updated by the modelled page excitation r.sup.1 .sub.n for the lowest throughput and makes it possible to deliver an optimal waveform and an associated estimated gain which make up the estimated perceptual signal P.sup.1.sub.n. An orthonormal transform module includes an adaptive transform module and a module for progressive modelling by orthogonal vectors, thus making it possible to deliver indices representing the coded speech signal. A circuit makes it possible to insert auxiliary data by stealing bits from the coded speech signal. Decoding is performed through extraction of datasignal and transmission of indices representing coded speech signal which is modelled at the minimum throughput.

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Dymarski, "Successive orthogonalizations in the multistage CELP coder", Mar. 23, 1992, pp. 61-64, vol. 1, Int'l Conf. on Acoustics Speech and Signal; Calf. USA.
Dymarski et al; "Optimal and sub-optimal algorithms for selecting the excitation in linear predictive coders": Apr. 1990, pp. 485-488; vol. 1 Int'l Conf. on Acoustics Speech and Signal Processing; Mexico USA.
Chen, "Real-time vector APC speech coding at 4800 BPS with adaptive postfiltering", Apr. 1987, pp. 2185-2188, vol. 4, Int'l Conf. on Acoutics Speech and Signal Processing; Dallas, Texas.

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