System for active noise control with audio signal compensation
First Claim
1. A method of generating a plurality of estimated path filters of an active noise control system comprising:
- selecting a first physical path present in the active noise control system;
selecting a second physical path present in the active noise control system;
inputting a first signal through the first physical path to generate a first output signal;
inputting the first signal through the second physical path to generate a second output signal;
comparing the first signal to the first output signal to generate a first transfer function based on the first physical path;
comparing the first signal to the second output signal to generate a second transfer function based on the second physical path; and
generating a first estimated path filter based on the first transfer function and a second estimated path filter based on the second transfer function.
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Abstract
An active noise control system generates an anti-noise signal to drive a speaker to produce sound waves to destructively interfere with an undesired sound in a targeted space. The speaker is also driven to produce sound waves representative of a desired audio signal. Sound waves are detected in the target space and a representative signal is generated. The representative signal is combined with an audio compensation signal to remove a signal component representative of the sound waves based on the desired audio signal and generate an error signal. The active noise control adjusts the anti-noise signal based on the error signal. The active noise control system converts the sample rates of an input signal representative of the undesired sound, the desired audio signal, and the error signal. The active noise control system converts the sample rate of the anti-noise signal.
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Citations
16 Claims
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1. A method of generating a plurality of estimated path filters of an active noise control system comprising:
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selecting a first physical path present in the active noise control system; selecting a second physical path present in the active noise control system; inputting a first signal through the first physical path to generate a first output signal; inputting the first signal through the second physical path to generate a second output signal; comparing the first signal to the first output signal to generate a first transfer function based on the first physical path; comparing the first signal to the second output signal to generate a second transfer function based on the second physical path; and generating a first estimated path filter based on the first transfer function and a second estimated path filter based on the second transfer function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An active noise control system comprising:
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a first estimated path filter representative of a first physical path traversed by a test signal, the first estimated path filter generated based on comparison of the test signal before and after traversing the first physical path; a second estimated path filter representative of a second physical path traversed by the test signal, the second estimated path filter generated based on comparison of the test signal before and after traversing the second physical path, the second estimated path filter being different from the first physical path filter; and a processor configured to apply the first estimated path filter to an audio signal, and the second estimated path filter to an undesired sound signal to generate an anti-noise signal for output by a loudspeaker. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification