Boundary layer microphone

Details Boundary layer microphone Boundary layer microphone

1998-01-29

2000-12-12

Woo, Stella

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381338, 381345, 381355, 381356, H04R 2500

Patent

active

061589020

ABSTRACT:
A boundary layer microphone is disclosed. Boundary layer microphones have been known for some considerable time. One example is the MKE 212 P microphone type made by Sennheiser electronic GmbH & Co. KG. The latter is a permanently polarized condenser microphone for concealed mounting in a wall, on the floor or on a table. Stereo recordings using such a boundary layer microphone are especially clear, creating a spatial impression of unusual breadth. The known boundary layer microphone MKE 212 P displays omnidirectional characteristics and a frequency range of 20 to 20,000 Hz. The disclosed boundary layer microphone is designed to increase the directional characteristics compared to a boundary layer microphone of the aforementioned type, and to reduce or eliminate the problems associated with same. This is achieved by a boundary layer microphone having at least one sound tunnel running underneath the plate surface, the plate having at least one opening to the sound tunnel. The transducer is located inside the sound tunnel and the transducer opening through which sound enters is positioned in the direction of the sound tunnel.

REFERENCES:
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patent: 4757546 (1988-07-01), Akino
patent: 4836326 (1989-06-01), Wehner
patent: 5033090 (1991-07-01), Weinrich
patent: 5168525 (1992-12-01), Muller
patent: 5682418 (1997-10-01), Ide
patent: 5703957 (1997-12-01), McAteer
patent: 5848172 (1998-12-01), Allen et al.

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