Reduction of flow-induced microphone noise
First Claim
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1. An apparatus comprising:
- a microphone having a pressure sensing area, andan acoustically transmissive, high flow resistance piece of material disposed at a distance of about 2-3 mm from said pressure sensing area, wherein said piece of material is shaped so that wind flow is deflected away from said pressure sensing area.
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Abstract
Flow-induced noise affecting microphones used in such applications as cellular phones is reduced by providing a deflector, made of an acoustically transmissive, high flow resistance material, disposed at a certain distance from the microphone pressure sensing area. The distance between the pressure sensing are and the deflector may be determined experimentally in consideration of any space constraints imposed by the specific application, and for cellular phones in particular, is approximately as little as 2 or 3 mm from the outside surface of the deflector.
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Citations
31 Claims
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1. An apparatus comprising:
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a microphone having a pressure sensing area, and an acoustically transmissive, high flow resistance piece of material disposed at a distance of about 2-3 mm from said pressure sensing area, wherein said piece of material is shaped so that wind flow is deflected away from said pressure sensing area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A cellular phone comprising:
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a microphone having a pressure sensing area, and an acoustically transmissive, high flow resistance piece of material disposed at a distance of about 2-3 mm from said pressure sensing area, wherein said piece of material is shaped so that wind flow is deflected away from said pressure sensing area. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A cellular phone comprising:
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a housing having an open port formed therein, a microphone disposed within a closed structure in said housing, said closed structure opening to said port, and an acoustically transmissive, high flow resistance piece of material disposed at a distance of about 2-3 mm from said port, wherein said piece of material is shaped so that wind flow is deflected away from said port. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification