Method and device for low bit rate speech coding

Details Method and device for low bit rate speech coding Method and device for low bit rate speech coding

G - Physics

10

L

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

Patent

CA 2586209

A method for coding speech or other generic signals includes dividing a speech signal into a plurality of frames, and dividing at least one of the plurality of frames into at least two subframe units. A search for a fixed codebook contribution and an adaptive codebook contribution for subframe units is conducted. At least one subframe unit is selected to be coded without the fixed codebook contribution. The encoder may iteratively arrange and encode subframes differently for the same frame, and select for transmission that arrangement that minimizes an error measure across the frame. Various embodiments are shown, as are embodied computer programs, a decoder, and a communication system.

L'invention porte sur un procédé de codage de la parole et d'autres signaux génériques consistant: à diviser un signal vocal en plusieurs trames, à diviser l'une au moins des trames en au moins deux sous-trames. A cet effet on effectue une recherche d'une contribution de livres fixes de codes et d'une contribution de livre adaptatifs de codes pour établir la sous-trame, et on choisit au moins l'une des sous-trames pour la coder sans la contribution des livres fixes de codes. Le codeur peut arranger itérativement les sous-trames et les coder différemment pour une même trame, et sélectionner en vue de la transmission l'arrangement réduisant l'erreur de mesure sur la trame. Plusieurs exécutions sont présentées ainsi que des programmes informatiques, un décodeur, et un système de communication.

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