A method for speech coding, method for speech decoding and...

H - Electricity – 04 – B

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H04B 14/04 (2006.01) G10L 19/00 (2006.01) G10L 19/12 (2006.01) G10L 19/14 (2006.01) H03M 7/30 (2006.01)

Patent

CA 2315699

A high quality speech is reproduced with a small data amount in speech coding and decoding for performing compression coding and decoding of a speech signal to a digital signal. In speech coding method according to a code-excited linear prediction (CELP) speech coding, a noise level of a speech in a concerning coding period is evaluated by using a code or coding result of at least one of spectrum information, power information, and pitch information, and various excitation codebooks are used based on an evaluation result

Procédé de codage/décodage sonore dans lequel un signal sonore est soumis à un codage de compression et est transformé en un signal numérique, et une haute qualité sonore est reproduite à partir d'une faible quantité d'informations. Dans un procédé de codage sonore à prévision linéaire à excitation par code (CELP), l'intensité sonore dans la section de codage est évaluée en utilisant au moins un code d'information spectral, d'information d'énergie et d'information du pas, ou en utilisant le résultat du codage. Conformément au résultat de l'évaluation, des tables à codes d'excitation différents (19 et 20) sont utilisées.

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