Radio communication system operable in cooperation with a VOX sy

Details Radio communication system operable in cooperation with a VOX sy Radio communication system operable in cooperation with a VOX sy

1987-05-22

1988-10-04

Griffin, Robert L.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 35, 34082548, H04B 100, H04Q 700

Patent

active

047760346

ABSTRACT:
In a radio communication system, a mobile station (11) includes a detecting circuit (16) for producing a detection signal during presence of an audio signal, a producing circuit (31) for delivering a predetermined coded data signal to an audio signal circuit (14) and for supplying a duration signal to a power unit (17) at the end of the detection signal. The power unit disables the transmitting circuit during absence of the detection signal and the duration signal. The transmitting circuit transmits a transmission radio signal modulated by the audio signal and the predetermined coded data signal. A fixed station (12) comprises a separating circuit (44) for separating a reproduction of the predetermined coded data signal from a reproduction of the audio signal. A discriminating circuit (45) discriminates the reproduction of the predetermined coded data signal. Consequently, the fixed station is able to discriminate between presence and absence of the audio signal.

REFERENCES:
patent: 2974221 (1961-03-01), Peth
patent: 3397401 (1968-08-01), Winterbottom
patent: 3526838 (1970-09-01), Banick
patent: 4501017 (1985-02-01), Higgins et al.
patent: 4613859 (1986-09-01), Mori
patent: 4628537 (1986-12-01), Shimakata
patent: 4654867 (1987-03-01), Labedz et al.

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