Speech coder

G - Physics – 10 – L

Patent

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Details

G10L 19/14 (2006.01) G10L 19/12 (2006.01) H04B 1/16 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2224688

A post-processor (317) and method substantially for enhancing synthesized speech is disclosed. The post-processor (317) operates on a signal ex(n) derived from an excitation generator (211) typically comprising a fixed code book (203) and an adaptive code book (204), the signal ex(n) being formed from the addition of scaled outputs from the fixed code book (203) and adaptive code book (204). The post-processor operates on ex(n) by adding to it a scaled signal pv(n) derived from the adaptive code book (204). A gain or scale factor p is determined by the speech coefficients input to the excitation generator (211). The combined signal ex(n) + pv(n) is normalised by unit (316) and input to an LPC or speech synthesis filter (208), prior to being input to an audio processing unit (209).

Cette invention concerne un post-processeur (37) et un procédé permettant d'améliorer la synthèse de la parole. Le post-processeur (317) opère sur un signal ex(n) dérivé d'un générateur d'excitations (211) comprenant généralement un code fixe (203) et un code adaptatif (204), le signal ex(n) étant formé par l'addition des sorties mises à l'échelle du code fixe (203) et du code adaptatif (204). le post-processeur opère sur ex(n) en lui ajoutant un signal mis à l'échelle pv(n) dérivé du code adaptatif (204). Un facteur de gain ou d'échelle p est déterminé par l'entrée des coefficients vocaux dans le générateur d'excitation (211). Le signal combiné ex(n) + pv(n) est normalisé par l'unité (316) et passe dans un filtre LPC ou synthétiseur de signaux vocaux (208), puis dans une unité de traitement audio (209).

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