Oscillator system for detecting a selected one of a plurality of

Details Oscillator system for detecting a selected one of a plurality of Oscillator system for detecting a selected one of a plurality of

1987-01-29

1988-12-20

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

455 41, 34087031, 379 55, 178 43, H04B 500, H04B 1302, G08C 1912

Patent

active

047929650

ABSTRACT:
The system of the present invention allows transmission of information and data across a gap, for example, from the steering wheel of an automobile to the steering column, without any physical connection between the information source and the information or data gathering circuit. Furthermore, the information source requires no power. The system of the present invention utilizes the principle that an oscillator circuit is loaded by an inductively coupled circuit tuned to oscillate at approximately the same frequency. Loading the oscillator circuit causes the oscillator L-C loop voltage amplitude to decrease. Using a first oscillator selectively switched between multiple frequencies, a circuit inductively coupled to that oscillator and selectively switched between multiple frequencies tuned to the frequencies of the oscillator, and a logic circuit for determining at which of the several frequencies the oscillator is running produces a decrease in oscillator L-C loop voltage, the system of the present invention provides for information and data to be transmitted across a gap without any physical connection between the information or data source and the information or data gatherine circuit.

REFERENCES:
patent: 3299424 (1967-01-01), Vinding
patent: 3427614 (1969-02-01), Vinding
patent: 4209783 (1980-06-01), Ohyama et al.
patent: 4312001 (1982-01-01), Marzolf

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