Device for encoding speech spectrum parameters with a...

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G10L 19/06 (2006.01) G10L 19/00 (2006.01) G10L 9/00 (1995.01)

Patent

CA 2115185

On encoding with a smallest possible number of bits LPC parameters produced by an LPC analyzer (19) from at least one of subframe signals of each frame signal of an input speech signal, a divider (21) divides the LPC parameters into several parameter regions. Using vector code books (25(1m), 25(2m)) loaded for each parameter region with code vectors, a vector quantizer (23) quantizes the LPC parameters into, for use as quantized codes, indexes of selected vectors which are selected from the code vectors and of which a linear combination minimizes a quantization distortion.

Dans le codage, avec le plus petit nombre de bits possible, de paramètres de codage productif linéaire produits par un analyseur de codage productif linéaire (19) à partir d'au moins un des signaux de sous-trame de chaque signal de trame d'un signal vocal, un diviseur (21) répartit ces paramètres en plusieurs régions. En utilisant des tables de codage de vecteurs (25(1m), 25(2m)) pour chaque région contenant des vecteurs de codage, un quantificateur vectoriel (23) quantifie les paramètres de codage productif linéaire en index de vecteur qui sont sélectionnés parmi les vecteurs de codage et dont une combinaison linéaire minimise la distorsion de quantification, pour en faire des codes quantifiés.

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