Ring around transceiver

Details Ring around transceiver Ring around transceiver

1988-02-01

1990-02-20

Orsino, Joseph A.

Telecommunications

Transmitter and receiver at separate stations

With control signal

455 70, 455 88, H04B 100

Patent

active

049033247

ABSTRACT:
The communications system of the present invention defines a complete feedback path consisting of first and second transceivers and an appropriate signal path. Each transceiver comprises a detector and a signal source capable of generating a signal at one of two frequencies. The detector in each of the transceivers is a two state device tuned to respond only to a predetermined desired difference frequency. If the desired difference frequency signal is present, the detector provides and output signal in a first state; if the desired difference signal is not present, the detector provides an output signal which is in a second state. The signal source can be a voltage controlled oscillator, a pair of single frequency oscillators, a synthesizer, or any signal source capable of being electrically switched between two frequencies. Data can be exchanged between the transceiver pair only when the desired difference frequency is present.

REFERENCES:
patent: 3001064 (1961-09-01), Alexis et al.
patent: 3641433 (1972-02-01), Mifflin et al.
patent: 3745464 (1973-07-01), Lee
patent: 3764917 (1973-10-01), Rhee
patent: 4019138 (1977-04-01), Watanabe et al.
patent: 4140973 (1979-02-01), Stevens

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