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NOISE-CANCELING SYSTEM

  • US 20100046769A1
  • Filed: 07/28/2009
  • Published: 02/25/2010
  • Est. Priority Date: 08/21/2008
  • Status: Abandoned Application
First Claim
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1. A noise-canceling system comprising:

  • a microphone that picks up ambient noise and outputs a noise signal;

    a cancel signal generator that receives the noise signal, and generates and outputs a cancel signal for reducing the ambient noise; and

    a speaker that receives and outputs an audio signal and the cancel signal, wherein the cancel signal generator comprises;

    a filter circuit that outputs a signal included in the noise signal in a predetermined frequency band;

    an inverting amplifier circuit that inverts and amplifies the signal output by the filter circuit and outputs the inverted and amplified signal, wherein the signal is amplified by an amplification degree that is greater than zero and less than one; and

    an adding circuit that outputs the cancel signal by adding the inverted and amplified signal output by the inverting amplifier circuit to the noise signal.

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