ACTIVE NOISE CONTROL USING BASS MANAGEMENT
First Claim
1. An active noise cancellation system for reducing, at a listening position, the power of a noise signal being radiated from a noise source to the listening position, the system comprising:
- an adaptive filter that receives a reference signal representing the noise signal, and provides a compensation signal;
a bass management unit that receives the compensation signal and applies a phase shift to the compensation signal to provide a phase shifted compensation signal,a first acoustic radiator that receives the phase shifted compensation signal and radiates audio indicative thereof to the listening position; and
a second acoustic radiator that receives the compensation signal and radiates audio indicative thereof to the listening position;
where transfer function characteristics from the input of the bass management system to the listening position approximately matches a desired transfer function.
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Accused Products
Abstract
An active noise cancellation system reduces, at a listening position, the power of a noise signal being radiated from a noise source to the listening position. The system includes an adaptive filter that receives a reference signal representing the noise signal, and provides a compensation signal. A bass management unit receives the compensation signal and applies a phase shift to the compensation signal to provide a phase shifted compensation signal. A first acoustic radiator receives the phase shifted compensation signal and radiates audio indicative thereof to the listening position. A second acoustic radiator receives the compensation signal and radiates audio indicative thereof to the listening position. The transfer function characteristics from the input of the bass management system to the listening position approximately matches a desired transfer function.
126 Citations
15 Claims
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1. An active noise cancellation system for reducing, at a listening position, the power of a noise signal being radiated from a noise source to the listening position, the system comprising:
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an adaptive filter that receives a reference signal representing the noise signal, and provides a compensation signal; a bass management unit that receives the compensation signal and applies a phase shift to the compensation signal to provide a phase shifted compensation signal, a first acoustic radiator that receives the phase shifted compensation signal and radiates audio indicative thereof to the listening position; and a second acoustic radiator that receives the compensation signal and radiates audio indicative thereof to the listening position; where transfer function characteristics from the input of the bass management system to the listening position approximately matches a desired transfer function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for reducing, at a listening position, the power of a noise signal being radiated from a noise source to the listening position, the method comprising:
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providing a reference signal representing the noise signal; adaptive filtering the reference signal to provide a compensation signal; supplying the compensation signal to at least two acoustic transducers via a bass management system for radiating the compensation signal or filtered versions thereof, where the bass management system distributes the compensation signal to the acoustic transducers and filters the compensation signal for at least a first acoustic transducer by a phase filter such that the transfer characteristic from the input of the bass management system to the listening position approximately matches a desired transfer function. - View Dependent Claims (11, 12, 13, 14)
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15. The method of claim 14, further comprising filtering the reference signal with a given transfer function before calculating therefrom the filter coefficients for the adaptive filter, the transfer function being an a-priori estimation of the transfer characteristic from the input of the bass management system to the listening position.
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15-1. The method of claim 16, where the filter coefficients for the adaptive filter are calculated using a Filtered-x LMS algorithm or a Filtered-e LMS algorithm.
Specification