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Selective active cancellation system for repetitive phenomena

  • US 4,878,188 A
  • Filed: 08/30/1988
  • Issued: 10/31/1989
  • Est. Priority Date: 08/30/1988
  • Status: Expired due to Term
First Claim
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1. Repetitive phenomena cancellation controller comprising:

  • phenomena input means for providing a phenomena signal representing a Phenomena to be cancelled;

    timing input means for providing a timing signal representative of a repetition rate of said phenomena;

    processor means, having inputs for said phenomena signal and said timing signal, for generating a cancellation signal to substantially eliminate said phenomena;

    output means connected to said processor means for providing a cancellation phenomena as a function of said cancellation signal;

    adaptive filter means, in said processor means, for generating said cancellation signal by adapting the filter means filtering characteristics as a function of said phenomena signal and timing signal; and

    phase means, in said processor means, for maintaining said adapting of said filtering characteristic within a 90°

    phase of said phenomena signal.

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