Method and apparatus for performing reduced rate variable...

G - Physics – 10 – L

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G10L 19/00 (2006.01) G10L 19/14 (2006.01) G10L 21/00 (2006.01) H04L 29/02 (2006.01)

Patent

CA 2172062

It is an objective of the present invention to provide an optimized method of selection of the encoding mode that provides rate efficient coding of input speech. A rate determination logic element (14) selects a rate at which to encode speech. The rate selected is based upon the target matching signal to noise ration computed by a TMSNR computation element (2), normalized autocorrelation computed by a NACF computation element (4), a zero crossings count determined by a zero crossings counter (6), the prediction gain differential computed by a PGD computation element (8) and the interframe energy differential computed by a frame energy differential element (10).

L'objectif de cette invention consiste à réaliser un procédé de sélection optimisé du mode de codage qui assure un codage à vitesse efficace de la parole. Un élément logique (14) qui détermine la vitesse sélectionne une vitesse de codage de la parole. La vitesse sélectionnée est fondée sur le rapport signal/bruit d'adaptation de la cible (RSBAC) calculé par un élément (2) de calcul du RSBAC, sur l'autocorrélation normalisée (AN) calculée par un élément (4) de calcul de la fonction AN, sur un décompte des passages à zéro déterminé par un compteur (6) des passages à zéro, sur la différence de gain prévisionnelle (DGP) calculée par un élément (8) de calcul de la DGP et sur la différence d'énergie entre trames (DET) calculée par un élément (10) de calcul de la DET.

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