Excitation vector generator, speech coder and speech decoder

G - Physics – 10 – L

Patent

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G10L 19/12 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2242345

An excitation vector generator to be used in a speech codec comprises a providing system, a storage system and an arranging system. This arranging system arranges a fixed waveform read from the storage system according to a position and a polarity of the pulse of the input impulse vector. Thereby, speech quality improves when a random code vector is decoded with an input impulse vector.

Le lecteur de vecteur de bruit et la liste de codes de bruits d'un codeur et décodeur vocal CELP classique sont remplacés par un oscillateur sortant différentes séquences vectorielles en fonction de l'entrée de valeurs de départ et d'une unité de mémorisation de valeurs de départ dans laquelle est mémorisée une pluralité de valeurs de départ respectives (valeurs de départ d'oscillateurs). Ce remplacement évite de mémoriser des vecteurs fixes dans une liste fixe de codes (ROM) et permet de limiter considérablement la capacité de la mémoire.

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