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Hearing aid with adaptive noise canceller

  • US 6,888,949 B1
  • Filed: 12/22/1999
  • Issued: 05/03/2005
  • Est. Priority Date: 12/22/1999
  • Status: Expired due to Term
First Claim
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1. A noise reduction system for a sound reproduction system, in particular for hearing aids, comprising:

  • a primary microphone outputting a first signal in response to received speech signals and received noise signals;

    a secondary microphone outputting a second signal in response to said received speech signals and said received noise signals;

    a first signal processing section comprising;

    a first signal delaying means, wherein said first signal is input into said first signal delaying means;

    a fixed filter, wherein said second signal is input into said fixed filter; and

    a first summing function, wherein a first signal delaying means output is subtracted from a fixed filter output by said first summing function to produce a noise reference signal; and

    a second signal processing section comprising;

    a second signal delaying means, wherein a speech reference signal output by said first signal processing section is input into said second signal delaying means;

    an adaptive filter, wherein said noise reference signal is input into said adaptive filter, wherein said adaptive filter has an adaptive mode of operation and a non-adaptive mode of operation, and a second summing function, wherein an adaptive filter output is subtracted from a second signal delaying means output by said second summing function to produce an output signal with an improved signal-to-noise ration, and wherein said adaptive filter operates in said non-adaptive mode of operation when speech dominates said output signal and operates in said adaptive mode of operation when speech does not dominate said output signal.

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