Electronic recognition and identification system for identifying

Details Electronic recognition and identification system for identifying Electronic recognition and identification system for identifying

1975-04-10

1976-05-18

Cook, Daryl W.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

340152T, G06K 708

Patent

active

039581055

ABSTRACT:
An electronic recognition and identification system for identifying one of a plurality of electrically coded keys, each having at least one tuned electrical circuit which is resonant at at least one of a plurality of predetermined frequencies. The system comprises a sweep oscillator for generating an alternating current signal. The alternating current signal has a frequency which varies with time over a range of frequencies including the plurality of predetermined frequencies. A condition pulse generating network is connected to the oscillator and produces a condition pulse when one of the keys is proximate thereto and when the frequency of the alternating current signal passes through its predetermined frequency. A plurality of reference pulse generating circuits are selectively connected to the oscillator by a sequential multiplexer. Each reference pulse generating circuit is responsive to the alternating current signal and is operative to produce a reference pulse when the frequency of the alternating current signal passes through one of the plurality of predetermined frequencies. A control circuit is responsive to the condition pulses and the reference pulses and is operative to produce a control signal when there is time coincidence between those pulses.

REFERENCES:
patent: 3671721 (1972-06-01), Hunn et al.
patent: 3752960 (1973-08-01), Walton
patent: 3816708 (1974-06-01), Walton
patent: 3816709 (1974-06-01), Walton
patent: 3842246 (1974-10-01), Kohler

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