Speech coding system

H - Electricity – 03 – M

Patent

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H03M 7/00 (2006.01) G10L 9/14 (1995.01)

Patent

CA 2118986

An adaptive codebook having an excitation signal predetermined in the past, an excitation codebook for vector quantizing an excitation signal or the input speech signal,and a gain codebook for vector quantizing gains of the adaptive and excitation codebooks are provided. A perceptually-weighted speech signal having a subframe length obtained by dividing the frame is developed by using the input speech signal and the spectral parameters. A zero input signal of a synthesis filter is developed for a predetermined length by providing the input speech signal of the present subframe as an initial value to the synthesis filter on the basis of the spectral parameters. An overlap signal is also developed by weighting the zero input signal on the basis of the spectral paremeters; Optimal codevectors are searched from the adaptive, excitation and gain codebooks acoording to a signal obtained by connecting the overlap signal to the trailing end of the perceptually-weighted speech signal.

Un livre de code adaptatif correspondant à un signal d'excitation prédéterminé dans le passé, un livre de code d'excitation pour la quantification vectorielle d'un signal d'excitation ou du signal de parole d'entrée, et un livre de code de gain pour la quantification vectorielle des gains correspondant aux livres de code adaptatif et d'excitation sont fournis. Un signal de parole pondéré perceptuellement et dont la longueur de sous-trame est obtenue en divisant la longueur de trame totale est généré à partir du signal de parole d'entrée et des paramètres spectraux. Un signal d'entrée nul d'un filtre de synthèse est généré pour une longueur prédéterminée en fournissant le signal de parole d'entrée de la sous-trame actuelle comme valeur initiale au filtre de synthèse, avec les paramètres spectraux. Un signal de recouvrement est également généré en pondérant le signal d'entrée nul en fonction des paramètres spectraux; les vecteurs de code optimaux sont cherchés dans les livres de code adaptatif, d'excitation et de gain, à partir d'un signal obtenu en reliant le signal de recouvrement au front descendant du signal de parole pondéré perceptuellement.

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