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Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adaptive filtering

  • US 5,402,496 A
  • Filed: 07/13/1992
  • Issued: 03/28/1995
  • Est. Priority Date: 07/13/1992
  • Status: Expired due to Term
First Claim
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1. A noise suppression apparatus for processing an audio input signal having both a desired component and an undesired component, comprising:

  • first filter means operatively coupled to said input signal for generating a reference signal by selectively passing an audio spectrum of said input signal containing primarily said undesired component;

    adaptive filter means operatively coupled to said input signal and to said reference signal for adaptively filtering said input signal in order to provide an adaptive filter output signal;

    combining means operatively coupled to said input signal and to said adaptive filter output signal for combining said adaptive filter output signal with said input signal to cancel said undesired component from said input signal and produce an error signal; and

    second filter means receiving said error signal for selectively passing to said adaptive filter means an audio spectrum of said error signal corresponding to said undesired component of said input signal;

    said adaptive filter means being controlled in accordance with a signal filtering algorithm that employs both said input signal selectively passed by said first filter and said selectively passed error signal;

    whereby said undesired component is effectively removed from said input signal without substantially affecting said desired component of said input signal.

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