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Automatic identification system for objects or persons by remote interrogation

  • US 5,528,221 A
  • Filed: 11/16/1993
  • Issued: 06/18/1996
  • Est. Priority Date: 05/28/1991
  • Status: Expired due to Term
First Claim
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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:

  • 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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