Device and method for determining a quantiser step size

Details Device and method for determining a quantiser step size Device and method for determining a quantiser step size

G - Physics

10

L

G10L 19/02 (2006.01)

Patent

CA 2557777

In order to determine a quantiser step size for quantising a signal comprising audio or video information, a first quantiser step size and an interference threshold are supplied (502). According to the invention, the actual interference introduced by means of the first quantizer step size is determined (504) and compared with the interference threshold (506). If the comparison indicates that the actually introduced interference is higher than the threshold, a second coarser quantizer step size is used (508), that is then used for the quantisation (514) if it emerges that the interference introduced by the coarser second quantizer step size is lower than the threshold or the interference introduced by the first quantiser step size (512). In this way, the quantisation interference is reduced during the coarsening of the quantisation and thus during an increase in the compression gain.

L'invention concerne un procédé pour déterminer un pas de quantification permettant de quantifier un signal pourvu d'informations audio ou vidéo, lequel procédé consiste à fournir un premier pas de quantification et un seuil de bruit (502). Selon ce procédé, le bruit réel introduit par l'intermédiaire du premier pas de quantification est ensuite déterminé (504) et comparé au seuil de bruit (506). Même si la comparaison indique que le bruit réellement introduit est supérieur au seuil, un deuxième pas de quantification plus approximatif est quand même utilisé (508), lequel pas est ensuite utilisé pour la quantification (514), s'il s'avère que le bruit introduit par l'intermédiaire du deuxième pas de quantification plus approximatif est inférieur au seuil ou au bruit introduit par l'intermédiaire du premier pas de quantification (512). Ainsi, le bruit de quantification est réduit lors de l'approximation de la quantification et lors d'une augmentation du gain de compression.

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