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Feedback cancellation improvements

  • US 6,219,427 B1
  • Filed: 09/12/1998
  • Issued: 04/17/2001
  • Est. Priority Date: 11/18/1997
  • Status: Expired due to Term
First Claim
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1. A hearing aid comprising:

  • a microphone for converting sound into an audio signal;

    feedback cancellation means including means for modelling a signal processing feedback signal to compensate for an estimated physical feedback signal;

    subtracting means, connected to the output of the microphone and the output of the feedback cancellation means, for subtracting the signal processing feedback signal from the audio signal to form a compensated audio signal;

    hearing aid processing means, connected to the output of the subtracting means, for processing the compensated audio signal;

    speaker means, connected to the output of the hearing aid processing means, for converting the processed compensated audio signal into a sound signal;

    wherein said feedback cancellation means forms a feedback path from the output of the hearing aid processing means to the input of the subtracting means and includes an adaptive filter having filter coefficients; and

    means for setting a maximum stable gain value in said hearing aid processing means, based upon the filter coefficients of the feedback cancellation means.

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