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System for active noise control with an infinite impulse response filter

  • US 8,199,924 B2
  • Filed: 04/17/2009
  • Issued: 06/12/2012
  • Est. Priority Date: 04/17/2009
  • Status: Active Grant
First Claim
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1. A computer-readable medium encoded with computer executable instructions, the computer executable instructions executable with a processor to operate an active noise control system, the computer-readable medium comprising:

  • instructions executable to generate an output signal of an infinite impulse response filter based on an input signal representative of an undesired sound, the infinite impulse response filter comprising a plurality of cascaded filters;

    instructions executable to generate an anti-noise signal based on the output signal of the infinite impulse response filter, where the anti-noise signal is configured to drive a speaker to produce sound waves to destructively interfere with an undesired sound;

    instructions executable to generate an update signal based on the output signal of the infinite impulse response filter and an error signal representative of sound waves produced from a combination of the undesired sound and the sound waves produced by the speaker; and

    instructions executable to independently update a plurality of coefficients included in each respective one of the cascaded filters of the infinite impulse response filter based on the update signal.

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