Automatic identification system for objects or persons by remote interrogation
First Claim
1. System for the automatic identification of objects or persons by remote interrogation comprising interrogating E/R (emitter/receiver) means adapted to continuously emit a radio frequency signal and answering E/R means associated with each of the objects or persons, said answering E/R means comprising:
- a reception and emission circuit (12,
18) adapted to receive radio frequency signals carrying coded information from the interrogating E/R means, adapted to emit radio frequency signals carrying an answer, and including at least one emitting/receiving antenna (18),an energizing device (16), andstorage means in which is stored a digitized code linked with the respective object or person;
said interrogating E/R means comprising;
a device (2b,
4) for emitting the radio frequency signals carrying the coded information, a device (4,
6) for receiving the radio frequency signals carrying the answer from the answering E/R means, and a modulator (2a) generating different wave shapes to be emitted in the radio frequency signals carrying the coded information,processing means adapted to control a search of the digitized code that is transmitted in the answer by the answering E/R means, anda memory adapted to store digitized codes received in the answer,characterized in that the answering E/R means also comprise;
a checking and sequencing circuit (20) adapted to control answer signals that answer the coded information signals transmitted by the interrogating E/R means, a code search sequence being defined by the signals exchanged between the interrogating E/R means and the answering E/R means for determining if a code received by the interrogating E/R means is a code being searched for by the processing means, andinhibiting means (26) connected to said checking and sequencing circuit and adapted to either temporarily inhibit or definitively inhibit the answering E/R means responsive to the interrogating E/R means, said inhibiting means incorporating at least first and second flip-flops, the first flip-flop (26a) being a temporary inhibiting flip-flop adapted to temporarily inhibit the answering E/R means during the search sequence when the answering E/R means determines that the digitized code being searched for is not the code stored in its storage means and the second flip-flop (26b) being a definitive inhibiting flip-flop ensuring definitive inhibition of the answering E/R means when the digitized code being searched for has been correctly received and stored by the interrogating E/R means.
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Accused Products
Abstract
Automatic identification system for objects or persons by remote interrogation. The invention relates to an interrogating E/R (emitter/receiver) or gate associated with an answering E/R or tag having a digitized code identifying the same. The gate supplies four information types in the form of signals to the tags which answer "yes" or, by an absence of any answer, "no" until the gate has found their codes. When its code has been found, the tag is inhibited, thus permitting the detection of other codes. The invention more particularly applies to the monitoring of persons carrying answering E/Rs or to the billing of goods on sale in a large surface area.
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Citations
10 Claims
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1. System for the automatic identification of objects or persons by remote interrogation comprising interrogating E/R (emitter/receiver) means adapted to continuously emit a radio frequency signal and answering E/R means associated with each of the objects or persons, said answering E/R means comprising:
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a reception and emission circuit (12,
18) adapted to receive radio frequency signals carrying coded information from the interrogating E/R means, adapted to emit radio frequency signals carrying an answer, and including at least one emitting/receiving antenna (18),an energizing device (16), and storage means in which is stored a digitized code linked with the respective object or person; said interrogating E/R means comprising; a device (2b,
4) for emitting the radio frequency signals carrying the coded information, a device (4,
6) for receiving the radio frequency signals carrying the answer from the answering E/R means, and a modulator (2a) generating different wave shapes to be emitted in the radio frequency signals carrying the coded information,processing means adapted to control a search of the digitized code that is transmitted in the answer by the answering E/R means, and a memory adapted to store digitized codes received in the answer, characterized in that the answering E/R means also comprise; a checking and sequencing circuit (20) adapted to control answer signals that answer the coded information signals transmitted by the interrogating E/R means, a code search sequence being defined by the signals exchanged between the interrogating E/R means and the answering E/R means for determining if a code received by the interrogating E/R means is a code being searched for by the processing means, and inhibiting means (26) connected to said checking and sequencing circuit and adapted to either temporarily inhibit or definitively inhibit the answering E/R means responsive to the interrogating E/R means, said inhibiting means incorporating at least first and second flip-flops, the first flip-flop (26a) being a temporary inhibiting flip-flop adapted to temporarily inhibit the answering E/R means during the search sequence when the answering E/R means determines that the digitized code being searched for is not the code stored in its storage means and the second flip-flop (26b) being a definitive inhibiting flip-flop ensuring definitive inhibition of the answering E/R means when the digitized code being searched for has been correctly received and stored by the interrogating E/R means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification