Directional microphone

Acoustics – Anatomic or prosthetic relation – Ear and mouth

Patent

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Details

179 1DM, 179180, 181158, H04R 138

Patent

active

039405753

ABSTRACT:
A pressure gradient directional microphone of the moving coil type in which the acousto-mechanical function of the transducer is achieved by a vibratile diaphragm the major area of which is of coneiform shape and the central portion of which is of dome shape and of significantly smaller area and provides a surround for attaching the coil. One side of the diaphragm is exposed to the sound field surrounding the microphone, and the other side is exposed to two cavities, one of relatively large volume behind that portion of the diaphragm which is of coneiform shape, and a second behind the dome portion which is sufficiently smaller that it is unnecessary to provide any phase-shift action for any sound pressure generated therein. The diaphragm is secured at its periphery to a support ring having a plurality of openings formed therein which serve as acoustic ducts from the ambient into the larger cavity.

REFERENCES:
patent: 2252846 (1941-08-01), Giannini et al.
patent: 2627558 (1953-02-01), Wiggins
patent: 2801294 (1957-07-01), Wurdel
patent: 3240883 (1966-03-01), Seeler
patent: 3581015 (1971-05-01), Masuda

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