Communications: electrical – Digital comparator systems
Patent
1975-11-24
1977-07-26
Pitts, Harold I.
Communications: electrical
Digital comparator systems
340274C, 340149A, E05B 4900
Patent
active
040386376
ABSTRACT:
A system for controlling access which comprises, at a control point, storage means such as a plurality of decimal switches into which can be stored a series of decimal digits. At a second point where access is desired, there is a single decimal switch which controls an oscillator to create a coded signal containing a plurality of pulses, representative of the decimal digit selected by the switch. This coded signal is transmitted to the control point, where it is decoded. If it corresponds to the decimal digit inserted in the first storage switch, a latch is set. A sequence of coded signals are generated, transmitted, and decoded. Corresponding latches are set at the control point if each signal corresponds to the corresponding decimal switch setting. When a full sequence of signals is completed and alllatches are set, then access is gained. Failure to transmit the correct signal or to use the signals in an incorrect order will fail to set all the latches, and access will be refused.
REFERENCES:
patent: 3654605 (1972-04-01), Honda
patent: 3706086 (1972-12-01), Farnsworth
patent: 3878511 (1975-04-01), Wagner
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