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Feedback cancellation with low frequency input

  • US 7,340,063 B1
  • Filed: 07/07/2000
  • Issued: 03/04/2008
  • Est. Priority Date: 07/19/1999
  • Status: Expired due to Fees
First Claim
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1. A method for canceling feedback in an acoustic system comprising a microphone, a speaker, a signal path between the microphone and the speaker, means for detecting presence of feedback between the speaker and the microphone, and first adaptive feedback cancellation filter means for compensating at least partly a possible feedback signal, the method comprising:

  • using a LMS algorithm for generating filter coefficients for the first adaptive feedback cancellation filter means and for generating identical filter coefficients for a second adaptive feedback cancellation filter means;

    using at least one highpass filter to prevent low-frequency signals from the signal path from entering the LMS algorithm; and

    using the second adaptive feedback cancellation filter means and a noise generator for providing low-frequency input for the LMS algorithm.

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