Local external communication device for enclosed helmet and mask

Details Local external communication device for enclosed helmet and mask Local external communication device for enclosed helmet and mask

1980-09-18

1983-02-15

Stellar, George G.

179157, 179 1SW, H04M 102

Patent

active

043743013

ABSTRACT:
A local external communication system for use with an enclosed helmet and mask assembly covering the head, ears, nose and mouth of the wearer and provided with earphones and a microphone and a plug for connection with a radio or intercom system, in which a housing adapted to be carried on a wearer's body houses a battery, a speaker and a microphone and carries a receptacle for receiving the communications plug of the mask and helmet assembly. The device includes a unity gain amplifier system having a peak limiting circuit associated with the microphone to limit amplification of external sounds to a safe level. A switch permits the wearer selectively to turn the device off, to listen only, or to both speak and listen through the device.

REFERENCES:
patent: 3180333 (1965-04-01), Lewis
patent: 3588359 (1971-06-01), Cribb

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