Spectral subtraction noise suppression method

G - Physics – 10 – L

Patent

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G10L 21/02 (2006.01)

Patent

CA 2210490

A spectral subtraction noise suppression method in a frame based digital communication system is described. Each frame includes a predetermined number N of audio samples, thereby giving each frame N degrees of freedom. The method is performed by a spectral subtraction (150) function ~(.omega.) which is based on an estimate (140) ~v(.omega.) of the power spectral density of background noise of non-speech frames and an estimate (130) ~x(.omega.) of the power spectral density of speech frames. Each speech frame is approximated (120) by a parametric model that reduces the number of degrees of freedom to less than N. The estimate ~x(.omega.) of the power spectral density of each speech frame is estimated (130) from the approximative parametric model.

L'invention se rapporte à un procédé de suppression de bruit par soustraction de spectre dans un système de communication numérique à base de trames. Chaque trame comporte un nombre déterminé N d'échantillons audio, ce qui confère à chaque trame N degrés de liberté. Le procédé est réalisé à l'aide d'une fonction H( omega ) de soustraction de spectre (150) qui est basée sur une valeur estimée (140) PHI v( omega ) de la densité spectrale de puissance de bruit de fond de trames non vocales et sur une valeur estimée (130) PHI x( omega ) de la densité spectrale de puissance des trames vocales. Chaque trame vocale est calculée par approximation (120) à l'aide d'un modèle paramétrique qui abaisse le nombre de degrés de liberté en dessous de N. La valeur estimée PHI x( omega ) de la densité spectrale de puissance de chaque trame vocale est calculée (130) à partir du modèle paramétrique approximatif.

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