Communication system noise cancellation power signal...

G - Physics – 10 – L

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G10L 21/02 (2006.01)

Patent

CA 2404027

In order to enhance the quality of a communication signal derived from speech and noise, a filter (50) divides a communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate the weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal (170).

Ladite invention vise à améliorer la qualité d'un signal de communication dérivé de voix et de bruit. A cet effet, un filtre (50) divise un signal de communication en une pluralité de signaux de bande de fréquence. Un calculateur produit une pluralité de signaux de bande de puissance ayant chacun une valeur de bande de puissance et correspondant à un des signaux de bande de fréquence. Les valeurs de bande de puissance proviennent de l'estimation sur un intervalle de temps de la puissance d'un des signaux de bande de fréquence. Cet intervalle de temps varie d'un signal de bande de fréquence à l'autre. Les valeurs de bande de puissance sont utilisées pour le calcul des facteurs de pondération servant à modifier les signaux de bande de fréquence, ces derniers étant combinés afin de produire un signal de communication amélioré (170).

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