Device and method for quantizing and inverse quantizing lpc...

G - Physics – 10 – L

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G10L 19/12 (2006.01)

Patent

CA 2729751

A device and a method for quantizing, in a super-frame including a sequence of frames, LPC filters calculated during the frames of the sequence. The LPC filter quantizing device and method comprises: an absolute quantizer for first quantizing one of the LPC filters using absolute quantization; and at least one quantizer of the other LPC filters using a quantization mode selected from the group consisting of absolute quantization and differential quantization relative to at least one previously quantized filter amongst the LPC filters. For inverse quantizing, at least the first quantized LPC filter is received and an inverse quantizer inverse quantizes the first quantized LPC filter using absolute inverse quantization. If any quantized LPC filter other than the first quantized LPC filter is received, an inverse quantizer inverse quantizes this quantized LPC filter using one of absolute inverse quantization and differential inverse quantization relative to at least one previously received quantized LPC filter.

L'invention porte sur un dispositif et sur un procédé de quantification, dans une supertrame comprenant une séquence de trames, des filtres à codage prédictif linéaire (LPC) calculés durant les trames de la séquence. Le dispositif et le procédé de quantification de filtre LPC comprennent : un quantificateur absolu pour tout d'abord quantifier l'un des filtres LPC à l'aide d'une quantification absolue; et au moins un quantificateur de l'autre filtre LPC utilisant un mode de quantification choisi dans le groupe constitué par une quantification absolue et une quantification différentielle par rapport à au moins un filtre précédemment quantifié parmi les filtres LPC. Pour la quantification inverse, au moins le premier filtre LPC quantifié est reçu et un quantificateur inverse quantifie de manière inverse le premier filtre LPC quantifié à l'aide d'une quantification inverse absolue. Si un quelconque filtre LPC quantifié autre que le premier filtre LPC quantifié est reçu, un quantificateur inverse quantifie de manière inverse ce filtre LPC quantifié à l'aide de l'une d'une quantification inverse absolue et d'une quantification inverse différentielle par rapport à au moins un filtre LPC quantifié précédemment reçu.

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