Transitioning between arrayed and in-phase speaker configurations for active noise reduction
First Claim
1. A noise cancellation system comprising:
- a plurality of speakers disposed within an area;
an amplifier in communication with the speakers; and
a system controller, in communication with the amplifier, producing a command signal in response to a signal from at least one microphone detecting sound in the area, the system controller including;
an arrayed speaker controller configured to produce a driver signal for each speaker in response to the command signal such that combined sound emitted by the speakers in response to the driver signals produces a substantially uniform sound pressure field having a magnitude and phase adapted to attenuate a noise field corresponding to the sound detected by the at least one microphone,an in-phase speaker controller configured to produce a common in-phase driver signal for all of the speakers in response to the command signal; and
a signal director module configured to proportion the command signal between the arrayed speaker controller and the in-phase speaker controller in response to a magnitude of voltage associated with driving, by the amplifier, the speakers in accordance with the command signal.
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Abstract
A noise cancellation method and system comprises a system controller that produces a command signal in response to a signal from at least one microphone detecting sound in an area. The system controller includes an arrayed speaker controller for producing a driver signal for each speaker in response to the command signal such that combined sound emitted by the speakers in response to the driver signals produces a substantially uniform sound pressure field adapted to attenuate a noise field corresponding to the sound detected by the at least one microphone. The system controller includes an in-phase speaker controller for producing a common in-phase driver signal for all speakers in response to the command signal and a signal director module for proportioning the command signal between the arrayed and in-phase speaker controllers in response to a magnitude of voltage associated with driving the speakers in accordance with the command signal.
29 Citations
26 Claims
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1. A noise cancellation system comprising:
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a plurality of speakers disposed within an area; an amplifier in communication with the speakers; and a system controller, in communication with the amplifier, producing a command signal in response to a signal from at least one microphone detecting sound in the area, the system controller including; an arrayed speaker controller configured to produce a driver signal for each speaker in response to the command signal such that combined sound emitted by the speakers in response to the driver signals produces a substantially uniform sound pressure field having a magnitude and phase adapted to attenuate a noise field corresponding to the sound detected by the at least one microphone, an in-phase speaker controller configured to produce a common in-phase driver signal for all of the speakers in response to the command signal; and a signal director module configured to proportion the command signal between the arrayed speaker controller and the in-phase speaker controller in response to a magnitude of voltage associated with driving, by the amplifier, the speakers in accordance with the command signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of attenuating noise comprising:
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producing a command signal in response to a signal from at least one microphone detecting sound in an area; proportioning the command signal between an arrayed speaker controller and an in-phase speaker controller in response to a magnitude of voltage associated with driving a plurality of speakers in accordance with the command signal; producing, by the arrayed speaker controller, when a first portion of the command signal is proportioned to the arrayed speaker controller, a driver signal for each of the speakers in response to the first portion of the command signal such that combined sound emitted by the speakers in response to the driver signals produces a substantially uniform sound pressure field having a magnitude and phase adapted to attenuate a noise field corresponding to the sound detected by the at least one microphone; and producing, by the in-phase speaker controller, when a second portion of the command signal is proportioned to the in-phase speaker controller, a common in-phase driver signal for all of the speakers in response to second portion of the command signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A vehicle comprising:
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a passenger compartment; and a noise cancellation system comprising; a plurality of speakers disposed within an area in the passenger compartment; an amplifier in communication with the speakers; and a system controller, in communication with the amplifier, producing a command signal in response to a signal from at least one microphone detecting sound in the area, the system controller including; an arrayed speaker controller configured to produce a driver signal for each of the speakers in response to the command signal such that combined sound emitted by the speakers in response to the driver signals produces a substantially uniform sound pressure field having a magnitude and phase adapted to attenuate a noise field corresponding to the sound detected by the at least one microphone, an in-phase speaker controller configured to produce a common in-phase driver signal for all of the speakers in response to the command signal; and a signal director module configured to proportion the command signal between the arrayed speaker controller and the in-phase speaker controller in response to a magnitude of voltage associated with driving, by the amplifier, the speakers in accordance with the command signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification