An adaptive criterion for speech coding

G - Physics – 10 – L

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G10L 19/14 (2006.01) G10L 19/08 (2006.01) G10L 11/06 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2342353

In producing from an original speech signal a plurality of parameters (gaQ,gfQ) from which an approximation of the orginal speech signal can be reconstructed, a further signal is generated in response to the original speech signal, which further signal is intended to represent the original speech signal. At least one of the parameters is determined (69, 71) using first and second differences between the original speech signal and the further signal. The first difference is a difference between a waveform associated with the original speech signal and a waveform associated with the further signal, and the second difference is a difference between an energy parameter derived from the original speech signal and a corresponding energy parameter associated with the further signal.

Lorsqu'on produit à partir d'un signal de parole de départ une pluralité de paramètres (gaQ, gfQ) à l'aide desquels une approximation du signal de parole de départ peut être reconstruite, un autre signal est généré en réponse au signal de parole de départ, cet autre signal étant destiné à représenter le signal de parole de départ. Au moins un des paramètres est déterminé (69, 71) au moyen des première et deuxième différences existant entre le signal de parole de départ et l'autre signal. La première différence est une différence entre une forme d'onde associée au signal de parole de départ et une onde de forme associée à l'autre signal, alors que la deuxième différence est une différence entre un paramètre d'énergie dérivé du signal de parole de départ et un paramètre d'énergie correspondant associé à l'autre signal.

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