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Non linear adaptive filters

  • US 4,792,915 A
  • Filed: 05/09/1986
  • Issued: 12/20/1988
  • Est. Priority Date: 05/10/1985
  • Status: Expired due to Term
First Claim
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1. A non linear adaptive filter comprising:

  • means for a receiving samples of a noise source signal,processing means for processing a predetermined number of said samples with values stored in said processing means to produce a cancellation signal,means for combining the cancellation signal with an input signal to produce an error signal, andadaptation means arranged to receive said error signal and adapt said stored values so that said error signal is substantially reduced over an initial training period wherein the adaptation means includesa first adaptation means for adapting the processing means to cancel noise according to a linear algorithma second adaptation means for adapting the processing means to cancel noise according to a non linear algorithm, andswitching means arranged to select said first adaptation means for a first part of said initial training period, said switching means selecting said second adaptation means after said first part of said initial training period.

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