Multiple adaptive filter active noise canceller

Details Multiple adaptive filter active noise canceller Multiple adaptive filter active noise canceller

G - Physics

10

K

G10K 11/16 (2006.01) G10K 11/178 (2006.01)

Patent

CA 2122108

An active adaptive noise canceller (100) that does not require a training mode and operates over an extended noise bandwidth. The canceller partitions the noise bandwidth into frequency sub-bands, and multiple adaptive filter channels (120, 140) are employed, one for each sub-band, to cancel noise energy in the respective sub-bands. Each channel includes bandpass filters (121, 130) to restrict the channel to operation over only the particular sub-band, and delays are inserted in the operation of the filter weight updating. Because each channel is stable over its sub-band, the canceller operates over the extended noise bandwidth of all the sub-bands.

L'invention est un éliminateur de bruit adaptatif actif (100) ne nécessitant pas de mode d'apprentissage qui fonctionne dans une bande de bruit élargie. Cet éliminateur segmente la bande de bruit en sous-bandes de fréquences et une multiplicité de canaux de filtrage adaptatif (120, 140) est utilisée, un canal pour chaque sous-bande, pour éliminer le bruit dans chacune des sous-bandes. Chaque canal comporte des filtres passe-bande (121, 130) pour limiter le fonctionnement du canal à la sous-bande en cause, avec retardements dans la mise à jour de la pondération des filtres. Étant donné que chaque canal est stable dans sa sous-bande, l'éliminateur fonctionne sur toute la largeur de la bande de bruit étendue de l'ensemble des sous-bandes.

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