Boundary-layer microphone

Details Boundary-layer microphone Boundary-layer microphone

1990-08-15

1992-12-01

Dwyer, James L.

Electrical audio signal processing systems and devices

Having non-electrical feature

Having microphone

381 87, 381 88, 381150, 381168, H04R 102, H04R 2500

Patent

active

051685256

ABSTRACT:
A boundary-layer microphone may obtain a frequency independent, hemispherical directional characteristic with a high tonal quality. The geometrical configuration of the mounting plate and the installed location of the membrane within the surface of the mounting plate are chosen so that a flat frequency response is obtained at the installed location of the membrane, i.e., the superposition of the incident primary sound field on the secondary sound field created by diffraction will not cause any deviation from a flat frequency response and a smooth, hemispherical polar pattern. The mounting plate may be triangular. The membrane may be installed in the vicinity of the center of gravity of a scalene triangle.

REFERENCES:
patent: 4314098 (1982-02-01), Maerfeld
patent: 4700396 (1987-10-01), Bolin
patent: 4742548 (1988-05-01), Sessler et al.
Crown International, Inc., "Pressure Zone Microphone", PZM-20R and PZM Microphones, Jan. 1990.
English translation of "Flach wie eine Flunder," Funkschau, No. 16, 1985, pp. 43 and 45.
"Flach wie eine Flunder," Funkschau, No. 16, 1985, pp. 43 and 45.

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