Relative noise ratio weighting techniques for adaptive noise...

G - Physics – 10 – L

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G10L 21/02 (2006.01)

Patent

CA 2404030

In order to enhance the quality of a communication signal comprising speech signal components due to speech and noise signal components due to noise, a filter (50) divides the communication signal into a plurality of frequency band signals representing the speech signal components and the noise signal components in a plurality of frequency bands. A calculator generates a plurality of weighting signals having weighting values corresponding to the frequency band signals. The weighting values (90, 100, 110) represent at least approximations of the normalized powers of the noise signal components in the frequency band signals. The frequency band signals are altered in response to the weighting signals to generate weighted frequency band signals which are combined to generate a communication signal with enhanced quality (170).

L'invention vise à améliorer la qualité d'un signal de communication contenant des composantes de signal vocal découlant de la parole, et des composants de signal de bruit découlant du bruit. A cet effet, un filtre (50) divise le signal de communication en une pluralité de signaux de bandes de fréquence représentant les composantes de signal vocal et les composants de signal de bruit dans une pluralité de bandes de fréquence. Un calculateur génère une pluralité de signaux de pondération ayant des valeurs de pondération correspondant aux signaux de bandes de fréquence. Ces valeurs de pondération (90, 100, 110) représentent au moins des approximations des puissances normalisées des composantes de signal de bruit dans les signaux de bandes de fréquence. Ces signaux de bandes de fréquence sont modifiés en réponse aux signaux de pondération afin de générer des signaux de bandes de fréquence pondérés, ces signaux étant combinés de manière à produire un signal de communication de meilleure qualité (170).

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