Identification system with separation and direction capability and improved noise rejection
First Claim
1. An electronic identification and memory data transmission system, comprising:
- a portable identifying device bearing electronically stored identification and other data;
one or more radio frequency oscillators for generating radio frequency output signals;
a logic circuit to read the stored data;
modulation means acting responsive to said stored data to modulate the said oscillators output signals;
an antenna to radiate the said modulated signals;
a reader to receive and store the said radiated signals at analog levels proportional in nature to the signal levels received;
a data processor to process said proportional stored signals; and
each reader including two or more reading systems, each with a proportional memory system and a data processor adapted to read and compare all the radiated signals.
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Accused Products
Abstract
An electronic identification system having a portable identifier with the ability to transmit by radio or audio signal the contents of an included memory upon interrogation or command to identify the user. The identifier transmits a plurality of radio frequencies intermittently to represent the memory data in digital form. The transmitted data includes a description of the proper bearer of the identifier so that a local check can be made to ascertain that the identifier is being carried by the proper person. The reader system not only identifies the bearer, but also makes a proportional recording of the transmitted data. With dual receivers and dual receiving antennas together with the proportional recording, it is possible to determine the direction of movement of the identifier through a portal into a limited access area. With proportional recording it is also possible to analyze the memory data and separate the signals from several identifiers which may have been transmitted in a time overlapping manner. Noise is cancelled by transmitting two differing radio frequencies and subtracting the signals of the two frequencies and by redundant transmission of the basic information.
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Citations
6 Claims
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1. An electronic identification and memory data transmission system, comprising:
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a portable identifying device bearing electronically stored identification and other data; one or more radio frequency oscillators for generating radio frequency output signals; a logic circuit to read the stored data; modulation means acting responsive to said stored data to modulate the said oscillators output signals; an antenna to radiate the said modulated signals; a reader to receive and store the said radiated signals at analog levels proportional in nature to the signal levels received; a data processor to process said proportional stored signals; and each reader including two or more reading systems, each with a proportional memory system and a data processor adapted to read and compare all the radiated signals. - View Dependent Claims (2, 3, 4, 5)
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6. An electronic identification and memory data transmission system, comprising:
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a portable identifying device bearing electronically stored identification and other data; one or more radio frequency oscillators for generating radio frequency output signals; a logic circuit to read the stored data; modulation means acting responsive to said stored data to modulate the said oscillators output signals; an antenna to radiate the said modulated signals; a reader to receive and store the said radiated signals at analog levels proportional in nature to the signal levels received; a data processor to process said proportional stored signals; said reader including a receiving antenna which has greater reception ability in some directions than others and which continuously rotates in multiple directions; said reader stores information indicating the direction of rotation of the said antenna; and said data processor includes a data analyzer which analyzes this direction in conjunction with signal strength to determine the direction of motion of the said portable identifying device and its bearer.
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Specification