Coded electronic lock and key

Details Coded electronic lock and key Coded electronic lock and key

1976-03-30

1978-03-14

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340274C, 340164R, H04Q 300

Patent

active

040793567

ABSTRACT:
An electronic key comprises a first binary counter and a first multiplexer or pulse code modulating a uniform clock pulse train to produce a first coded pulse train modulated with a given code. The key is connected to an electronic lock comprising: a second binary counter and a second multiplexer for pulse code modulating the same clock pulse train to produce a second coded pulse train modulated with the same code; an EXCLUSIVE-OR gate to which said first and second multiplexers are connected; a first NAND gate having one input connected to the output of the EXCLUSIVE-OR gate; a flip-flop or a binary counter having its clock input connected to the output of the NAND gate and an inital logical ONE output connected to a second input of the NAND gate; a second NAND gate having one input connected to the output of the flip-flop or counter and another input connected to the output of the second multiplexer; and a binary output counter having its clock input connected to the output of the second NAND gate. The output of the lock is taken from one of the counting outputs of the output counter.

REFERENCES:
patent: 3934122 (1976-01-01), Riccitelli
patent: 3944976 (1976-03-01), France
patent: 3979647 (1976-09-01), Perron

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