Unidirectional electret microphone

Details Unidirectional electret microphone Unidirectional electret microphone

1982-03-18

1984-06-26

Pitts, Harold I.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179111R, 179121D, 179179, 307400, H04R 1901, H04R 1904

Patent

active

044567960

ABSTRACT:
A partition wall is held in contact with a back electrode on the opposite side from a diaphragm, and a fine acoustic path is formed in at least one of the contact surfaces of the partition wall and the back electrode. The acoustic path communicates with a sound hole made in the back electrode and a sound hole made in the partition wall. The velocity component of sound reaching the back of the diaphragm is controlled by the fine acoustic path.

REFERENCES:
patent: 4117275 (1978-09-01), Miyanaga
patent: 4236051 (1980-11-01), Nakagawa et al.
patent: 4281222 (1981-07-01), Nakagawa et al.

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