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Noise reduction apparatus

  • US 20040252846A1
  • Filed: 06/08/2004
  • Published: 12/16/2004
  • Est. Priority Date: 06/12/2003
  • Status: Abandoned Application
First Claim
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1. A noise reduction apparatus in a sound reproduction system for reproducing and outputting sound to a sound field based on electric audio signals, comprising:

  • first and second microphones arranged in said sound field;

    a first signal processing part for executing a delay processing and an inversion amplification processing for a first sound field electric signal acquired through said first microphone on the basis of a first delay instruction value and a first gain instruction value;

    a reproduction output part for reproducing and outputting a superimposed signal acquired by superimposing said electric audio signal to an output signal of said first signal processing part as a sound pressure signal;

    a second signal processing part for executing a delay processing and an inversion amplification processing for said electric audio signal on the basis of a second delay instruction value and a second gain instruction value;

    a signal superimposing part for superimposing a second sound field electric signal acquired through said second microphone with an output signal from said second signal processing part; and

    a feedback control part for controlling said first and second delay instruction values and said first and second gain instruction values in accordance with the magnitude of the output signal from said signal superimposing part.

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