Method for quantizing speech coder parameters

G - Physics – 10 – L

Patent

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G10L 19/14 (2006.01) G10L 11/06 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2345373

The invention concerns a method which consists in: gathering (17) the parameters on N consecutive frames to form a super-frame; carrying out a vector quantization (18) of the voicing transition frequencies during each super-frame, by transmitting without degradation only the most frequent configurations and by replacing the least frequent configurations by the closest configuration in terms of absolute error among the most frequent; encoding the pitch (19), by scalar quantization of only one pitch value for each super-frame; encoding the energy (20) by selecting only a reduced number of values by gathering said values into sub-packets quantized by vector quantization (21); encoding by vector quantization (21) the spectral envelope parameters by selecting only a predetermined number of filters, the non-transmitted parameters being reconstructed by interpolation or extrapolation from the transmitted filter parameters. The invention is applicable to vocoders.

Le procédé consiste à regrouper (17) les paramètres sur N trames consécutives pour former une super-trame, à effectuer une quantification vectorielle (18) des fréquences de transition du voisement au cours de chaque super-trame, en ne transmettant sans dégradation que les configurations les plus fréquentes et en remplaçant les configurations les moins fréquentes par la configuration la plus proche en terme d'erreur absolue parmi les plus fréquentes, à coder le pitch (19) en ne quantifiant scalairement qu'une seule valeur du pitch pour chaque super-trame, à coder l'énergie (20) en ne sélectionnant qu'un nombre réduit de valeurs en regroupant ces valeurs en sous paquets quantifiés par quantification vectorielle, à coder par quantification vectorielle (21) les paramètres d'enveloppe spectrale en ne sélectionnant qu'un nombre déterminé de filtres, les paramètres non transmis étant reconstruits par interpolation ou extrapolation à partir des paramètres des filtres transmis. Application: vocodeurs.

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