Mitigation of unstable conditions in an active noise control system
AssigneeBose Corporation
InventorEmery M. Ku
Life of this patent
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Abstract
The technology described in this document can be embodied in a computer-implemented method that includes receiving a portion of a feedback signal of an active noise control (ANC) system, and processing the portion of the feedback signal using an adaptive line enhancer (ALE) filter to detect a tonal signature. The method also includes determining, by one or more processing devices, that the tonal signature represents an unstable condition, and responsive to determining that the tonal signature represents an unstable condition, generating one or more control signals for adjusting one or more parameters of the ANC system, to mitigate the unstable condition.
Claims26
A computer-implemented method comprising:
- receiving a portion of a feedback signal of an active noise control (ANC) system;
- processing the portion of the feedback signal using an adaptive line enhancer (ALE) filter to detect a tonal signature;
- computing, by one or more processing devices, a quantity representing a ratio of (i) a first quantity indicative of an energy of the tonal signature, to (ii) a second quantity indicative of an energy of a combination of a residual error received from the ALE filter, and a signal-of-interest associated with an acoustic transducer;
- determining, based on the quantity, by the one or more processing devices, that the tonal signature represents an unstable condition;
- and
- responsive to determining that the tonal signature represents an unstable condition, generating one or more control signals for adjusting one or more parameters of the ANC system, to mitigate the unstable condition.
(canceled)
An active noise control (ANC) system comprising:
- an error sensor configured to provide a feedback signal;
- and
- an instability detector comprising:
- an adaptive line enhancer (ALE) filter configured to process at least a portion of the feedback signal to detect a tonal signature, and
- a detection engine comprising one or more processing devices, the detection engine configured to:
- compute a quantity as a ratio of (i) a first quantity indicative of the energy of the tonal signature, to (ii) a second quantity indicative of the energy of a combination of a residual error received from the ALE filter, and a signal-of-interest associated with an acoustic transducer;
- determine, based on the quantity, that the tonal signature represents an unstable condition, and
- responsive to determining that the tonal signature represents an unstable condition, generate one or more control signals for adjusting one or more parameters of the ANC system, to mitigate the unstable condition.
(canceled)
A machine-readable storage device having encoded thereon computer readable instructions for causing one or more processors to perform operations comprising:
- receiving a portion of a feedback signal of an active noise control (ANC) system;
- processing the portion of the feedback signal using an adaptive line enhancer (ALE) filter to detect a tonal signature;
- computing a quantity as a ratio of (i) a first quantity indicative of the energy of the tonal signature, to (ii) a second quantity indicative of an energy of a combination of the residual error received from the ALE filter, and a signal-of-interest associated with an acoustic transducer;
- determining, based on the quantity, that the tonal signature represents an unstable condition;
- and
- responsive to determining that the tonal signature represents an unstable condition, generating one or more control signals for adjusting one or more parameters of the ANC system, to mitigate the unstable condition.
Dependencies are inferred from the claim text.