Active attenuation of noise in a closed structure

Details Active attenuation of noise in a closed structure Active attenuation of noise in a closed structure

G - Physics

10

K

181/11

G10K 11/00 (2006.01) G10K 11/178 (2006.01)

Patent

CA 1196579

ACTIVE ATTENUATION OF NOISE IN A CLOSED STRUCTURE Abstract This invention is directed to a system for the active acoustic attenuation of noise produced in the interior of an enclosure by a source of noise which in one aspect comprises input sensing operable to sense the source noise to be atten- uated, cancelling news adapted to produce noise 180° out of phase with the source noise and error sensing means operable to sense the acoustic summation of the source noise and the noise produced by the cancelling means. The input sensing means, cancelling means and error sensing means are each preferably disposed at or immediately adjacent an area of high acoustic pressure within the enclosure. The system further includes a second input sensing means disposed adjacent the source of noise, a second cancelling means adapted to introduce noise 180° out of phase with the source noise at a location at or immediately adjacent the enclosure wall and second error sensing means disposed in the interior of the enclosure. Each set of input sensing means, cancelling means and error sensing means are adapted to be connected to an electronic controller means operable to process signals from the input sensing means, produce outputs to drive the cancelling means for the introduc- tion of cancelling sound waves into the enclosure for combina- tion with the source sound waves, and then adjust such outputs based on signals received from the error sensing means.

442733

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