Methods and systems for controlling noise cancellation
First Claim
1. A method for detecting failure in a noise cancellation system operable to at least partially cancel an unwanted noise within a defined space, wherein the unwanted noise is produced by a target noise source located outside of the defined space, the method comprising:
- sensing a target noise with a dedicated sensing device located at the target noise source, the sensing device configured to receive noise primarily from the target noise source;
receiving a cancellation noise signal from the noise cancellation system, the cancellation noise signal representing a cancellation noise that, when combined with the target noise in the defined space, is operable to at least partially cancel the target noise in the defined space;
receiving an error signal approximately representing a portion of the target noise remaining after the cancellation noise and the target noise are combined;
for each of the received cancellation noise signal and the error signal, determining whether the signal level changed or remains unchanged; and
based on the determination, assigning a failure state of the noise cancellation system and initiating a remedial measure corresponding with the assigned failure state.
1 Assignment
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Accused Products
Abstract
A method for detecting failure in a noise cancellation system is provided. The noise cancellation system is operable to at least partially cancel an unwanted noise produced by a noise source. The method includes receiving a cancellation noise signal from the noise cancellation system. The cancellation noise signal represents a cancellation noise that, when combined with a target noise, is operable to at least partially cancel the target noise. The method also includes receiving an error signal approximately representing a portion of the target noise that remains after the cancellation noise and the target noise are combined. The method also includes determining whether the signal level changed or remains unchanged for each of the received cancellation noise signal and the error signal. The method also includes assigning a failure state of the noise cancellation system based on the determination and initiating a remedial measure that corresponds with the assigned failure state.
31 Citations
22 Claims
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1. A method for detecting failure in a noise cancellation system operable to at least partially cancel an unwanted noise within a defined space, wherein the unwanted noise is produced by a target noise source located outside of the defined space, the method comprising:
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sensing a target noise with a dedicated sensing device located at the target noise source, the sensing device configured to receive noise primarily from the target noise source; receiving a cancellation noise signal from the noise cancellation system, the cancellation noise signal representing a cancellation noise that, when combined with the target noise in the defined space, is operable to at least partially cancel the target noise in the defined space; receiving an error signal approximately representing a portion of the target noise remaining after the cancellation noise and the target noise are combined; for each of the received cancellation noise signal and the error signal, determining whether the signal level changed or remains unchanged; and based on the determination, assigning a failure state of the noise cancellation system and initiating a remedial measure corresponding with the assigned failure state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for detecting failure in a noise cancellation system, the noise cancellation system configured to at least partially cancel an environmental noise within an enclosed space, comprising:
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a computer having a microprocessor and a computer-readable medium coupled to the microprocessor; a sensing device located at a target noise source outside of the enclosed space, the sensing device dedicated to receiving a target noise from the target noise source; and a program stored in the computer-readable medium, the program, when executed by the microprocessor, operable to; receive a cancellation noise signal from the noise cancellation system, the cancellation noise signal representing a cancellation noise that, when combined with the target noise in the enclosed space, is operable to at least partially cancel the target noise in the enclosed space; receive an error signal approximately representing a portion of the target noise remaining after the cancellation noise and the target noise are combined; determine whether the signal level changed or remains unchanged for each of the received cancellation noise signal and the error signal; and based on the determination, assign a failure state of the noise cancellation system and initiate a remedial measure corresponding with the assigned failure state. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for detecting failure in an active noise cancellation system operable to at least partially cancel an unwanted noise in a compartment of a vehicle, the unwanted noise including a target noise produced by a target noise source located outside of the compartment, the method comprising:
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sensing the target noise with a dedicated sensor disposed proximate the target noise source and remote from the compartment; receiving a cancellation noise signal from the active noise cancellation system of the vehicle, the cancellation noise signal representing a cancellation noise that, when combined with the target noise in the compartment, is operable to substantially cancel the target noise; receiving a pure error signal representing only the portion of the target noise remaining after the cancellation noise and the target noise are combined; determining that the signal level of the cancellation noise signal is increasing and above a first threshold; determining that the signal level of the pure error signal is increasing at a time when the signal level of the cancellation noise signal is increasing and above the first threshold; indicating that the active noise cancellation system is unstable; and initiating at least a partial deactivation of the active noise cancellation system.
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Specification