Patent ID: 8199924

Claim:
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.