Variable rate speech coding method and decoding method

G - Physics – 10 – L

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G10L 19/14 (2006.01)

Patent

CA 2218118

In a variable rate speech coding method for a CELP speech coding system, an adaptive sound source vector and a first noise source vector are selected from a sound source code book and a noise source code book so that a first synthesized speech signal is obtained which has a minimum distortion relative to an input speech signal. A virtual reference speech signal is generated using a sound source signal which is produced using the adaptive sound source vector. A second noise source vector corresponding to the adaptive sound source vector is selected so that a second synthesized speech signal is obtained which has a minimum distortion relative to the virtual reference speech signal. The sending of a noise source code book index corresponding to the first noise source vector is suspended according to the quality of the second synthesized speech signal.

Dans une méthode de codage de la parole à débit variable pour un système de codage de la parole PLCOSE, un vecteur de source sonore adaptatif et un vecteur de première source sonore sont sélectionnés à partir d'un dictionnaire du chiffre de source sonore et d'un dictionnaire de chiffre de source de bruit afin d'obtenir un premier signal vocal synthétisé ayant un minimum de distorsions par rapport à un signal vocal d'entrée. Un signal vocal de référence virtuel est généré au moyen d'un signal sonore de source produit à l'aide du vecteur de source sonore adaptatif. Un second vecteur de source de bruit correspondant au vecteur de source sonore adaptatif est sélectionné pour obtenir un second signal vocal synthétisé ayant un minimum de distorsions par rapport au signal vocal de référence virtuel. La transmission d'un index de dictionnaire du chiffre de source de bruit correspondant au vecteur de la première source de bruit est suspendue en fonction de la qualité du second signal vocal synthétisé.

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