Quantization in perceptual audio coders with compensation...

G - Physics – 10 – L

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G10L 19/00 (2006.01) H04B 1/66 (2006.01) G10L 19/02 (2006.01)

Patent

CA 2366560

Many perceptual split-band coding systems that use analysis and synthesis filters assume the quantization noise introduced by quantizing split-band signals is substantially the same as the noise that results in the output signal obtained by applying the synthesis filters to the quantized split-band signals. In general, this assumption is not true because the synthesis filters modify or spread the quantization noise. A theoretical framework for deriving an optimum bit allocation that accounts for synthesis-filter noise spreading is disclosed. In concept, the problem of finding an optimal bit allocation can be expressed as a linear optimization problem in a multidimensional coordinate space. Simplified processes derived from this theoretical framework are disclosed that can obtain near-optimal solutions using modest computational resources.

De nombreux systèmes de codage perceptif en bandes séparées, qui utilisent des filtres d'analyse et de synthèse, considèrent que le bruit de quantification introduit par la quantification de signaux en bandes séparées est sensiblement identique au bruit dans le signal de sortie, obtenu par l'application de filtres de synthèse aux signaux en bandes séparées quantifiés. Cette hypothèse est en général erronée, les filtres de synthèse modifiant ou étalant le bruit de quantification. L'invention concerne un cadre théorique destiné à dériver une affectation de bits optimale tenant compte de l'étalement du bruit des filtres de synthèse. En théorie, le problème consistant à trouver une affectation de bits optimale peut être exprimé en termes de problème d'optimisation linéaire dans un espace de coordonnées multidimensionnel. L'invention concerne également des procédés simplifiés dérivés de ce cadre théorique, qui peuvent apporter des solutions quasi-optimales avec de modestes ressources de calcul.

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