Speech coder

G - Physics – 10 – L

Patent

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Details

G10L 19/12 (2006.01) G10L 19/10 (2006.01) H03M 7/30 (2006.01) H04B 14/04 (2006.01)

Patent

CA 2336360

A speech coder capable of achieving an excellent sound quality even at a low bit rate. A mode judging circuit 800 of the speech coder judges a mode by the use of a feature quantity of an input speech signal for each subframe. In case of a predetermined mode, an excitation quantization circuit 350 searches combinations of every code vectors stored in codebooks 351 and 352 for simultaneously quantizing amplitudes or polarities of a plurality of pulses and each of a plurality of shift amounts for temporally shifting predetermined pulse positions, and selects a combination of the code vector and the shift amount which minimizes distortion from an input speech. A gain quantization circuit 365 quantizes a gain by the use of a gain codebook 380.

L'invention concerne un codeur vocal produisant un son de bonne qualité même avec un débit binaire lent. Un circuit (800) d'évaluation de mode évalue un mode en fonction du signal vocal introduit pour chaque sous-trame au moyen d'une fonction. Un circuit (350) de quantification du son effectue une recherche en combinant des vecteurs de code mémorisés dans des registres de code (351, 352) afin de quantifier l'ensemble des amplitudes ou des polarités des impulsions ainsi que les décalages temporaires des positions d'impulsions prédéterminées si le mode est un mode prédéterminé, et sélectionne une combinaison de vecteur de code et de décalage qui réduit la distorsion de l'entrée vocale, et un circuit (365) de quantification de gain quantifie le gain au moyen d'un code (380) de gain.

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