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ADAPTIVE NOISE CONTROL SYSTEM

  • US 20100195844A1
  • Filed: 01/29/2010
  • Published: 08/05/2010
  • Est. Priority Date: 01/30/2009
  • Status: Active Grant
First Claim
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1. An active noise cancellation system for reducing, at a listening position, power of a noise signal radiated from a noise source to the listening position, the system comprising:

  • an adaptive filter that receives a reference signal representing the noise signal, and provides a compensation signal in response to the received reference signal;

    a signal source that provides a measurement signal;

    an acoustic actuator that radiates the compensation signal and the measurement signal to the listening position;

    a microphone that receives a first signal that is a superposition of the radiated compensation signal, the radiated measurement signal, and the noise signal at the listening position, and provides a microphone signal in response to the received first signal;

    a secondary path comprising a secondary path system that represents a signal transmission path between an output of the adaptive filter and an output of the microphone; and

    an estimation unit that estimates a transfer characteristic of the secondary path system in response to the measurement signal and the microphone signal.

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