Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1985-07-02
1987-02-17
Lev, Robert G.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 63, 34082544, H04Q 704
Patent
active
046441050
ABSTRACT:
A communication switch circuit is provided by which quasi-duplex communication may be had between a telephone party and a mobile unit in a simplex two-way radio communication system. Specifically, the communication switch circuit includes (i) a keying circuit to selectively energize a transmitter and (ii) an interrupt circuit to intermittently, temporarily deenergize the transmitter to permit reception from a mobile unit. The communication switch circuit further includes a control circuit which prevents reenergizing of the transmitter if a signal is received from a mobile unit while the transmitter is temporarily deenergized thereby permitting a mobile unit to interrupt the telephone party and interject a comment. The communication switch circuit also includes control circuits which permit a mobile unit to initiate and terminate calls.
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Lev Robert G.
P.T.I., Inc.
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