ROBUST PROCESS FOR MANAGING FILTER COEFFICIENTS IN ADAPTIVE NOISE CANCELING SYSTEMS
First Claim
1. A system for managing the changing state of an adaptive filter in an active noise control (ANC) system, comprising:
- an adaptive filter state storage that is to store copies of prior states of the adaptive filter;
a disturbance detector; and
an adaptive filter state manager that is to a) signal that a copy of a current state of the adaptive filter be repeatedly written to the state storage so long as the disturbance detector is detecting normal ambient noise,and b) signal that the adaptive filter be restored to one of its prior states, from the copies stored in the state storage, when the disturbance detector detects abnormal noise.
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Abstract
A system for managing the changing state of an adaptive filter in an active noise control (ANC) system is described. An adaptive filter state storage stores copies of prior states of the adaptive filter. A disturbance detector can detect either normal ambient noise or abnormal ambient noise. An adaptive filter state manager signals that a copy of a current state of the adaptive filter is to be repeatedly written to the state storage, so long as normal ambient noise is being detected. But when abnormal noise is detected, the state manager signals that the adaptive filter be restored to one of its prior states, from the copies stored in the state storage. Other embodiments are also described and claimed.
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Citations
24 Claims
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1. A system for managing the changing state of an adaptive filter in an active noise control (ANC) system, comprising:
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an adaptive filter state storage that is to store copies of prior states of the adaptive filter; a disturbance detector; and an adaptive filter state manager that is to a) signal that a copy of a current state of the adaptive filter be repeatedly written to the state storage so long as the disturbance detector is detecting normal ambient noise, and b) signal that the adaptive filter be restored to one of its prior states, from the copies stored in the state storage, when the disturbance detector detects abnormal noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for managing the changing state of an adaptive filter in an active noise control (ANC) system, comprising:
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repeatedly writing a copy of a current state of the adaptive filter to storage, while normal ambient noise is being detected as time passes; and restoring the adaptive filter to one of its prior states, from the copies in the storage, when abnormal noise is detected. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A system for managing the changing state of an adaptive filter in an active noise control (ANC) system, comprising:
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means for repeatedly storing snapshots of the state the adaptive filter while normal ambient noise, not abnormal noise, is being detected as time passes; and means for signaling that the adaptive filter be restored to one of its stored prior states and frozen in that prior state, when abnormal noise is detected. - View Dependent Claims (23, 24)
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Specification