Diver's piezoelectric microphone with integral AGC preamplifier

Details Diver's piezoelectric microphone with integral AGC preamplifier Diver's piezoelectric microphone with integral AGC preamplifier

1976-01-28

1977-03-22

Tudor, Harold

Communications: electrical

Selective

Interrogation response

310 91, 340 8R, H04B 1300

Patent

active

040139921

ABSTRACT:
An improved microphone assembly for use in a diver's mask or helmet and wh is characterized by a substantially flat frequency response at pressures from 1 to 30 or more atmospheres of breathing gas. A silicone rubber coated piezoelectric diaphragm is mounted by its periphery in a cylindrical housing with both sides of the diaphragm exposed to ambient gas pressures. A ground plate is mounted in said housing with one side in spaced relation to the diaphragm and having on the other side thereof a preamplifier and automatic gain control circuit electrically connected to the diaphragm and encased in waterproof potting compound.

REFERENCES:
patent: 2551556 (1951-05-01), Brennan
patent: 2755343 (1956-07-01), Levy
patent: 3073916 (1963-01-01), Williams et al.
patent: 3281769 (1966-10-01), Hueter
patent: 3331970 (1967-07-01), Dundon et al.
patent: 3387149 (1968-06-01), Young
patent: 3562451 (1971-02-01), Mullen, Jr. et al.
patent: 3708702 (1973-01-01), Brunnert
patent: 3775749 (1973-11-01), Tegholm
patent: 3879726 (1975-04-01), Sweany

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