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Method and apparatus for the active reduction of compression waves

  • US 5,224,168 A
  • Filed: 05/08/1991
  • Issued: 06/29/1993
  • Est. Priority Date: 05/08/1991
  • Status: Expired due to Fees
First Claim
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1. An apparatus for reducing undesired compression waves in a quiet zone of a medium comprising:

  • a plurality of input transducers sensitive to undesired compression waves outside of a quiet zone of a medium and operative to produce a plurality of input signals in response thereto;

    means for processing said plurality of input signals to produce a plurality of output signals, wherein each of said output signals is derived from each of said input signals such that said apparatus includes a plurality of channels at least equal to the product of the number of said input signals and the number of said output signals; and

    a plurality of output transducers responsive to said plurality of output signals and operative to produce complementary compression waves in said medium which combine with said undesired compression waves in said quiet zone.

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