Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1978-08-18
1980-09-23
Cook, Daryl W.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235488, 340152T, 343 65R, G06K 500, G06K 1906, H04Q 902, G01S 956
Patent
active
042238307
ABSTRACT:
An electronic identification and recognition system including a portable radio frequency signal generator having a circuit for repeatedly generating and transmitting an identifying signal having predetermined characteristics of frequency and pulse length.
A single crystal determines the radio frequency signal and the two modulating square wave rates, and the bit data rate, so that synchronism with a remote receiver is readily obtained. A low level of transmitting power is chosen to allow non-interfering transmission on a variety of radio frequencies, and also to allow significant circuit simplifications and economics.
Transmission may be initiated by push button or by interrogation from the central receiver station.
A receiver receives and synchronously decodes the transmitted signal.
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patent: 4025791 (1977-05-01), Lennington et al.
patent: 4047156 (1977-09-01), Atkins
Cook Daryl W.
Moore Gerald L.
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