ADAPTIVE NOISE CONTROL
First Claim
1. An adaptive noise control system for reducing, at a listening position, the power of an acoustic noise signal radiated from a noise source to the listening position, the system comprising:
- an adaptive filter that receives an electrical reference signal representing the acoustic noise signal and an electrical error signal representing the acoustic signal at the listening position and that provides an electrical output signal;
a signal processing arrangement that receives the electrical output signal and that provides a first electrical compensation signal indicative of the electrical output signal multiplied by a first gain factor and a second electrical compensation signal indicative of the electrical output signal multiplied by a second gain factor and filtered, the second gain factor being equal to 1 subtracted by the first gain factor;
the second compensation signal being added to the error signal for compensation; and
at least one acoustic transducer that receives the first electrical compensation signal and radiates an acoustic compensation signal indicative of the first electrical compensation signal to the listening position.
1 Assignment
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Accused Products
Abstract
Adaptive noise control for reducing power of an acoustic noise signal radiated from a noise source to a listening position comprises providing an electrical reference signal correlated with the acoustic noise signal; filtering the electrical reference signal with an adaptive filter to provide an electrical output signal; multiplying the electrical output signal of the adaptive filter by a gain factor to provide a first electrical compensation signal; filtering and multiplying the electrical output signal of the adaptive filter by the inverse of the gain factor to provide a second electrical compensation signal, the second gain factor being equal to 1 subtracted by the first gain factor; radiating the first electrical compensation signal to the listening position with an acoustic transducer; sensing a residual electrical error signal at the listening position; adding the second electrical compensation signal to the electrical error signal to provide a compensated error signal; and adapting filter coefficients of the adaptive filter as a function of the compensated error signal and the reference signal.
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Citations
15 Claims
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1. An adaptive noise control system for reducing, at a listening position, the power of an acoustic noise signal radiated from a noise source to the listening position, the system comprising:
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an adaptive filter that receives an electrical reference signal representing the acoustic noise signal and an electrical error signal representing the acoustic signal at the listening position and that provides an electrical output signal; a signal processing arrangement that receives the electrical output signal and that provides a first electrical compensation signal indicative of the electrical output signal multiplied by a first gain factor and a second electrical compensation signal indicative of the electrical output signal multiplied by a second gain factor and filtered, the second gain factor being equal to 1 subtracted by the first gain factor;
the second compensation signal being added to the error signal for compensation; andat least one acoustic transducer that receives the first electrical compensation signal and radiates an acoustic compensation signal indicative of the first electrical compensation signal to the listening position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An adaptive noise control method for reducing, at a listening position, power of an acoustic noise signal radiated from a noise source to the listening position, the method comprising:
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providing an electrical reference signal associated with the acoustic noise signal; filtering the electrical reference signal with an adaptive filter to provide an electrical output signal; multiplying the electrical output signal of the adaptive filter by a gain factor to provide a first electrical compensation signal; filtering and multiplying the electrical output signal of the adaptive filter by the inverse of the gain factor to provide a second electrical compensation signal, the second gain factor being equal to 1 subtracted by the first gain factor; radiating the first electrical compensation signal to the listening position with an acoustic transducer; sensing a residual electrical error signal at the listening position; adding the second electrical compensation signal to the electrical error signal to provide a compensated error signal; and adapting filter coefficients of the adaptive filter as a function of the compensated error signal and the reference signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification