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Noise attenuation

  • US 5,018,203 A
  • Filed: 10/23/1989
  • Issued: 05/21/1991
  • Est. Priority Date: 02/24/1987
  • Status: Expired due to Fees
First Claim
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1. Apparatus for attenuating noise, the apparatus comprising a diaphragm one side of which is subjected to the noise, sensing means for sensing the actual displacement of the diaphragm in response to the noise, and deflecting means responsive to the sensing means for deflecting the diaphragm in order to cancel the displacement, to attenuate noise transmitted from one side of the diaphragm to the other side of the diaphragm, the diaphragm being divided up into separate areas, each area having a corresponding sensing means cooperating with a deflecting means, so that each area of the diaphragm is separately driven.

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