| 摘要 |
An identification system is provided in which an interrogation signal is transmitted by a transmitting and receiving unit located at an object, and a portable code transmitter transmits a response signal. The interrogation signal and the response signal are alternately transmitted in sections. If, first, code information contained in the response signal is compared and successfully verified with reference information, and second, an overall signal delay time is shorter than a reference code, then an enable signal is produced in order to allow one to access an object or to allow one to use the object.
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