Method and device for coding transition frames in speech...

G - Physics – 10 – L

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G10L 19/08 (2006.01) G10L 19/12 (2006.01)

Patent

CA 2666546

There is provided a transition mode device and method for use in a predictive-type sound signal codec for producing a transition mode excitation replacing an adaptive codebook excitation in a transition frame and/or a frame following the transition in the sound signal, comprising an input for receiving a codebook index and a transition mode codebook for generating a set of codevectors independent from past excitation. The transition mode codebook is responsive to the index for generating, in the transition frame and/or frame following the transition, one of the codevectors of the set corresponding to the transition mode excitation. There is also provided an encoding device and method and a decoding device and method using the above described transition mode device and method.

La présente invention concerne un dispositif et un procédé de mode de transition à utiliser dans un codec de signal de son, de type prédictif, pour produire une excitation du mode de transition remplaçant une excitation de livre de code adaptatif dans une trame de transition ou une trame autorisant la transition dans le signal sonore, comprenant une entrée pour recevoir un indice de livre de code et un livre de code de mode de transition pour générer un ensemble de vecteurs de code indépendants de l'excitation passée. Le livre de code du mode de transition répond à l'indice pour générer, dans la trame de transition ou la trame suivant la transition, l'un des vecteurs de code du jeu correspondant à l'excitation du mode de transition. L'invention concerne également un dispositif et un procédé de codage et un dispositif et un procédé de décodage à l'aide du dispositif et du procédé du mode de transition susmentionné.

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