Systems and methods for adaptive noise cancellation
First Claim
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1. A method, comprising:
- disposing a plurality of secondary sensors on an exterior surface of a three dimensional windscreen;
disposing a primary sensor within an interior of the three dimensional windscreen;
measuring pressure at the primary sensor to produce a primary pressure signal;
measuring pressure at the plurality of secondary sensors to produce secondary pressure signals;
filtering the secondary pressure signals to produce a filtered pressure signal; and
subtracting the filtered pressure signal from the primary pressure signal to reduce noise, induced by non-acoustic pressure disturbances, in the primary pressure signal.
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Abstract
A system (400) for reducing non-acoustic noise includes a primary sensor (420), at least one secondary sensor (410), a filter (415), and a summation unit (425). The primary sensor (420) measures pressure and produces a primary pressure signal. The at least one secondary sensor (410) measures pressure and produce a secondary pressure signal. The filter (415) processes the secondary pressure signal to produce a filtered pressure signal. The summation unit (425) subtracts the filtered pressure signal from the primary pressure signal to reduce non-acoustic noise in the primary pressure signal.
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Citations
21 Claims
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1. A method, comprising:
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disposing a plurality of secondary sensors on an exterior surface of a three dimensional windscreen; disposing a primary sensor within an interior of the three dimensional windscreen; measuring pressure at the primary sensor to produce a primary pressure signal; measuring pressure at the plurality of secondary sensors to produce secondary pressure signals; filtering the secondary pressure signals to produce a filtered pressure signal; and subtracting the filtered pressure signal from the primary pressure signal to reduce noise, induced by non-acoustic pressure disturbances, in the primary pressure signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system, comprising:
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a three dimensional windscreen having an exterior surface and an interior; a primary sensor located within the interior of the windscreen and configured to measure pressure and to produce a primary pressure signal; a plurality of secondary sensors disposed on the exterior surface of the windscreen and configured to measure pressure and to produce secondary pressure signals; a filter configured to process the secondary pressure signals to produce a filtered pressure signal; and a summation unit configured to subtract the filtered pressure signal from the primary pressure signal to reduce noise, induced by non-acoustic pressure disturbances, in the primary pressure signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method, comprising:
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disposing a plurality of second sensors on an exterior surface of a three dimensional windscreen;
disposing a first sensor within an interior of the three dimensional windscreen;sensing disturbances at the first sensor and the plurality of second sensors, the first sensor producing a first signal and the plurality of second sensors producing second signals; adaptively filtering the second signals to produce a filtered signal; and subtracting the filtered signal from the first signal to cancel the disturbances associated with the first signal. - View Dependent Claims (14, 15, 16)
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17. A system for canceling disturbances from a sensor signal, comprising:
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a first sensor and a plurality of second sensors configured to sense disturbances, the first sensor producing a first signal and the plurality of second sensors producing second signals; a filter configured to adaptively filter the second signals to produce a filtered signal; a summation unit configured to subtract the filtered signal from the first signal to cancel the disturbances from the first signal; and
a windscreen, wherein the first sensor is disposed within an interior of the windscreen and wherein the plurality of second sensors are disposed on an external surface of the windscreen. - View Dependent Claims (18, 19, 20)
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21. A method, comprising:
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measuring pressure with a first sensor located inside a windscreen to produce a measurement signal; measuring pressure at a plurality of second sensors disposed on an exterior surface of the windscreen to infer a net pressure acting on the windscreen, the net pressure comprising acoustic and non-acoustic pressure; filtering signals from the plurality of second sensors to estimate a component of the non-acoustic pressure that is correlated with the net pressure; and subtracting the estimated component of non-acoustic pressure from the measurement signal to reduce noise in the measurement signal.
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Specification