Background noise reduction in sinusoidal based speech coding...

G - Physics – 10 – L

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G10L 21/02 (2006.01) G10L 19/02 (2006.01)

Patent

CA 2399706

A method and apparatus to reduce background noise in speech signals in order to improve the quality and intelligibility of processed speech. In mobile communications environment, speech signals are degraded by additive random noise. A randomness of the noise, which is often described in terms of its first and second order statistics, make it difficult to remove much of the noise without introducing background artifacts. This is particularly true for lower signal to background noise ratios. The method and apparatus provides noise reduction without any knowledge of the signal to background noise ratio.

L'invention concerne un procédé et un appareil permettant de réduire un bruit de fond dans des signaux vocaux en vue d'améliorer la qualité et l'intelligibilité de la voix traitée. Dans un environnement de communications mobiles, les signaux vocaux sont altérés par un bruit aléatoire ajouté. Le caractère aléatoire du bruit, qui est souvent décrit en terme de ses première et seconde statistiques d'ordre, rend difficile la tâche d'élimination d'une grande partie du bruit sans introduction d'artefacts de fond. Ceci est notamment vrai pour un signal inférieur aux taux du bruit de fond. Le procédé et l'appareil permettent une réduction du bruit sans avoir connaissance du rapport signal bruit de fond.

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