Active acoustic attenuator

Details Active acoustic attenuator Active acoustic attenuator

G - Physics

10

K

181/11

G10K 11/00 (2006.01) G10K 11/178 (2006.01) H03H 21/00 (2006.01) H04R 1/00 (2006.01)

Patent

CA 1161766

Abstract An active acoustic attenuator is provided by the subject invention for the attenuation of a relatively broad band of lower frequency sound from a given source propagating through a confined enclosure such as a duct, by the introduction of cancelling sound having the mirror image amplitude and phase characteristics of the source sound. The active acoustic attenuator herein includes a speaker disposed at a remote location from the duct which is connected thereto by a waveguide. The speaker is driven by electronic circuitry including an adaptive filter having a modified LMS algorithm governing the operation of its transversal filter which accommodates the inherent delays associated with the propagation of acoustic waves in a duct.

383951

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