Predictive coding-decoding system for a digital nested code adaptive transform speech signal.

摘要

The invention relates to a coding system predictive of a digital code speech signal. BR/ The coded digital signal (Sn) is formed by a coded speech signal and, if necessary, by auxiliary data. A perceptual weighting filter (11) is formed by a short-term prediction filter of the speech signal to be encoded to achieve a frequency distribution of the quantization noise. A circuit (12) allows effec BR/ (CF DRAWING IN BOPI) BR/ BR/ perceptual signal reactualized Pn. A long-term prediction circuit (13) is formed, in a closed loop, from a dictionary updated by the modeled past excitation BR/ (CF DRAWING IN BOPI) BR/ BR/ module of An orthonormal transform (MT) comprises an adaptive transform module (14) and a progressive orthogonal vector modeling module (16), thereby providing indexes representative of the encoded speech signal. A circuit (19) allows the insertion of the auxiliary data by bit the encoded speech signal. BR/ Application to any transmission system and the storage of speech signals.