Non-directional electret microphone with an air passage to balan

Details Non-directional electret microphone with an air passage to balan Non-directional electret microphone with an air passage to balan

1977-06-13

1978-09-26

Stellar, George G.

H04R 1904

Patent

active

041172752

ABSTRACT:
A non-directional capacitive microphone assembly comprises an electrically conductive casing which is air-tight except at least one sound hole formed in front end of the casing and a capacitive diaphragm disposed behind the sound hole. The sound hole is communicated with a cavity formed behind the diaphragm through an air passage provided in the casing.

REFERENCES:
patent: 3646281 (1972-02-01), McGunigle
patent: 3816671 (1974-06-01), Fraim et al.

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