Active acoustic attenuation system for higher order mode...

Details Active acoustic attenuation system for higher order mode... Active acoustic attenuation system for higher order mode...

G - Physics

10

K

179/5

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

Patent

CA 1296649

Abstract A system is provided for increasing the frequency range of an active acoustic attenuation system in a duct without increasing cut-off frequency fc of the duct or otherwise splitting or partitioning the duct into separate ducts or chambers. The frequency range is increased above fc to include higher order modes. A plurality of cancelling model sets are provided. Each transverse portion of the acoustic pressure wave has its own set of an adaptive filter model, cancelling speaker, and error microphone. A single input microphone may service all sets.

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