Digital feed-forward active noise control system

G - Physics – 10 – K

Patent

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G10K 11/178 (2006.01)

Patent

CA 2225631

A method of noise control of an acoustic signal comprising: obtaining a reference signal (X) of the acoustic signal to be controlled, applying an antinoise signal to the acoustic signal so as to control the acoustic signal, obtaining an error signal (E) resulting from the application of the antinoise signal (U) to the acoustic signal, generating the antinoise signal from the reference signal by passing the noise signal through a first filter (33) having controllable filter coefficients, using a simplified model (31) of a signal path from a location (19) of the antinoise signal to a location (21) of the error signal to obtain modified representations of the noise signal, controlling the filter coefficients by processing the error signal and the modified representation of the noise signal and generating a coefficient control signal (35) such as to generate the antinoise signal, and applying the coefficient control signal to the first filter.

Cette invention concerne un procédé de réduction du bruit d'un signal acoustique, lequel procédé comprend les étapes suivantes: obtenir un signal de référence (X) du signal acoustique à réduire; appliquer un signal antibruit au signal acoustique de manière à réduire ce dernier; obtenir un signal d'erreur (E) résultant de l'application du signal antibruit (U) au signal acoustique; générer un signal antibruit à partir du signal de référence en faisant passer le signal de bruit à travers un premier filtre (33) ayant des coefficients de filtrage réglables; faire appel à un modèle simplifié (31) du parcours du signal depuis un emplacement (19) du signal antibruit vers un emplacement (21) du signal d'erreur, de manière à obtenir des représentations modifiées du signal de bruit; régler les coefficients du filtre en traitant le signal d'erreur et la représentation modifiée du signal de bruit, et générer un signal de commande de coefficient (35) de manière à générer le signal antibruit; et, enfin, appliquer le signal de commande de coefficient au premier filtre.

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