System for active noise control based on audio system output
First Claim
1. A sound reduction system comprising:
- a processor; and
an active noise control system executable by the processor, the active noise control system configured to;
receive a first input signal representative of sound present in a predetermined area;
receive as a second input signal an output signal generated by an audio system communicatively coupled with the sound reduction system, the audio system configured to drive a loudspeaker to produce a desired sound in the predetermined area;
generate an anti-noise signal based on the first input signal; and
adjust the anti-noise signal based on the second input signal;
where, the anti-noise signal is configured to drive a loudspeaker to produce an audible sound to destructively interfere with an undesired sound present in the predetermined area.
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Accused Products
Abstract
An active noise control (ANC) system is configured to generate at least one anti-noise signal configured to drive a speaker to generate sound waves to destructively interfere with an undesired sound present in a target space. The at least one anti-noise signal is adjusted based an output signal of an audio system. The at least one anti-noise signal may be adjusted based on at least one of a volume level of the audio system, a power level of at least one predetermined frequency or frequency range of the output signal of the audio system, frequency content of an output signal of the audio system. The ANC system receives an error signal to adjust generation of the at least one anti-noise signal. The error signal is adjusted to compensate for adjustment of the at least one anti-noise signal based on the output signal of the audio system.
193 Citations
37 Claims
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1. A sound reduction system comprising:
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a processor; and an active noise control system executable by the processor, the active noise control system configured to; receive a first input signal representative of sound present in a predetermined area; receive as a second input signal an output signal generated by an audio system communicatively coupled with the sound reduction system, the audio system configured to drive a loudspeaker to produce a desired sound in the predetermined area; generate an anti-noise signal based on the first input signal; and adjust the anti-noise signal based on the second input signal; where, the anti-noise signal is configured to drive a loudspeaker to produce an audible sound to destructively interfere with an undesired sound present in the predetermined area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 37)
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14. A method of reducing volume of an undesired sound present in a space comprising:
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generating a first input signal representative of the undesired sound present in a predetermined area; receiving as a second input signal an output signal produced by an audio system, the audio system configured to drive a loudspeaker to produce desired sound in the space; generating an anti-noise signal based on the first input signal; adjusting the anti-noise signal based on the second input signal; and producing an audible sound based on the anti-noise signal to destructively interfere with the undesired sound present in the space. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A computer-readable medium encoded with computer executable instructions, the computer executable instructions executable with a processor, the computer-readable medium comprising:
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instructions executable to generate a first input signal representative of an undesired sound present in a predetermined area; instructions executable to receive as a second input signal an output signal produced by an audio system, the audio system configured to drive a loudspeaker to produce desired sound in the predetermined area; instructions executable to generate an anti-noise signal based on the first input signal; instructions executable to adjust the anti-noise signal based on the second input signal; and instructions executable to produce an audible sound based on the anti-noise signal to destructively interfere with the undesired sound present in a space the predetermined area. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification