Communication apparatus for hostile environments

Details Communication apparatus for hostile environments Communication apparatus for hostile environments

1981-04-15

1985-01-01

Schreyer, Stafford D.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 89, H04R 144, H04M 105

Patent

active

044916990

ABSTRACT:
A dual communication system is disclosed including a microphone for mounting for use by a wearer of a protective face mask, the output signal from the microphone being communicated to both a speaker system for local, audible broadcast and to a transmitter for remote broadcast by radio signal.

REFERENCES:
patent: 3174129 (1965-03-01), Laughlin et al.
patent: 3258534 (1966-06-01), Goldsworthy
patent: 3268854 (1966-08-01), Sato
patent: 3370236 (1968-02-01), Walker
patent: 3549831 (1970-12-01), Forney
patent: 3586977 (1971-06-01), Lustig
patent: 3588359 (1971-06-01), Cribb
patent: 3889190 (1975-06-01), Palmer
patent: 3890475 (1975-06-01), Denhart
patent: 3968435 (1975-02-01), Stover
patent: 4017797 (1977-04-01), Laessig
patent: 4152553 (1979-05-01), White
"Dyna-Com 12", Layfayette Catolog 710, 1971, p. 456.
"Uni-Com", ITT Publication, 1980.
"Speak-Ezee," Scott ATO Publication, Jun. 1979.

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