| 摘要 |
A recognition system for identification-card singularity comprises an identification card, a detail communication device attached to a detail computer, and a master communication device attached to a master computer. The identification card consists of a first piezoelectric substrate, an individual coded IDT, and a first electrode-group. The detail communication device consists of a second piezoelectric substrate and transmitting- and receiving sections. The transmitting section is composed of a first bipolar-pulse generator, first and second coded IDTs, a second electrode-group, an envelope detecting device, and a monopolar-pulse generator. The receiving section is composed of a third electrode-group, a second bipolar-pulse generator, an intermediary IDT, third and fourth coded IDTs, and a detecting device. If the identification card is set in the detail communication device, a pulse is generated at the first bipolar-pulse generator at regular intervals. When the pulse is applied to the individual coded IDT, an individual SAW is excited on the first piezoelectric substrate. The individual SAW is detected at the first electrode group as an individual double-coded burst-signal, which is converted into an individual double-coded digital-signal at the monopolar-pulse generator and delivered into a digital network. When the individual double-coded digital-signal is received by the master communication device, the signal decoding is achieved, so that the identification-card singularity is recognized by the master communication device.
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