Method for generating a spectral noise weighting filter for...

G - Physics – 10 – L

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G10L 19/12 (2006.01)

Patent

CA 2132006

Analysis by synthesis calculates a difference by subtracting (130) synthesized speech from input speech. The synthesized speech is formed by exciting long and short term filters (124,126) with excitation vectors from a codebook store (114) which is searched by codebook generation (120). A weighting filter (132) is applied to the difference signal and the weighted difference is used to calculate an energy measure (134) which is used to control the codebook search (140). The weighting filter is an Rth-order filter controlled with calculated coefficients. The method for calculating coefficients models the frequency response of L Pth-order filters by a single Rth-order filter, where the order R ~ LxP. This method increases the control of a speech coder filter without an increase in hardware complexity.

L'invention est une méthode d'analyse par synthèse qui calcule une différence en soustrayant (130) une parole synthétisée d'une parole d'entrée. La parole synthétisée est formée en excitant des filtres à termes longs et courts (124, 126) au moyen de vecteurs d'excitation extraits d'une mémoire à table de codage (114) explorée par génération de codes (120). Le signal de différence est transmis à un filtre de pondération (132) et la différence pondérée sert à calculer l'énergie (134) utilisée pour commander l'exploration (140) de la table de codage. Le filtre de pondération est un filtre d'ordre R contrôlé à coefficients calculés. La méthode de calcul des coefficients est basée sur la réponse fréquentielle de L filtres d'ordre P par un seul filtre d'ordre R, où R < L x P. Cette méthode améliore le contrôle d'un filtre de codeur de paroles sans augmenter la complexité du matériel.

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