Reduction of flow-induced microphone noise

Details Reduction of flow-induced microphone noise Reduction of flow-induced microphone noise

1997-05-13

2000-09-12

Harvey, Minsun Oh

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Housed microphone

379433, H04R 908, H04R 1104, H04R 1702

Patent

active

061188816

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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Notes on Sound Absorption Technology, Noise Control Foundation, Version 94-02, Notebook #3, Ingard, K. Uno Chapter 2, pp. 26-28; Chapter 10, pp. 17-18, New York, 1994.
Some Investigations on Output Level of Microphones in Air Streams, The Journal of the Acoustical Society of America, vol. 46, No. 6 (Part 1), pp. 1391-1396, Nakamura, A., Matsumoto, R., Sugiyama, A., and Tanaka, T., Mar. 10, 1969.

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