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Active noise cancellation system utilizing a signal delay to accommodate noise phase change

  • US 20030016833A1
  • Filed: 07/15/2002
  • Published: 01/23/2003
  • Est. Priority Date: 07/19/2001
  • Status: Abandoned Application
First Claim
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1. A noise cancellation system, comprising:

  • a nonacoustic sensor that provides a signal indicating a position or frequency of a source of noise;

    an actuator that is adapted to provide a noise cancellation signal and is positioned a distance from the source of noise;

    a signal generator that is responsive to the signal from the sensor and provides a noise canceling reference signal to cause the actuator to produce the noise cancellation signal, the signal generator adjusting the phase of the reference signal corresponding to a phase change that occurs as the noise travels from the source to the speaker location.

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