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Training a recursive filter by use of derivative function

  • US 5,905,659 A
  • Filed: 10/07/1997
  • Issued: 05/18/1999
  • Est. Priority Date: 10/07/1997
  • Status: Expired due to Term
First Claim
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1. A method of adapting a filter having a plurality of recursive filter parameters, said recursive filter effective for producing an output signal in response to receiving an input signal, the method comprising:

  • subtracting said output signal from a desired signal to produce an error signal;

    producing a plurality of derivative functions, each of whose level is representative of derivative of said output signal with respect to a particular recursive filter parameter; and

    updating each of said recursive filter parameters based on said derivative functions and said error signal.

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