| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a collation system which can surely prevent duplication of a radio wave by preventing the radio wave from being received by a receiver other than a preset receiver. <P>SOLUTION: A collation system comprises: a portable device 20 which transmits signals S by adding noise signals N at a frequency f2 different from a communication frequency f1 of the signals S; and an in-vehicle digital receiver 30 which digitally converts the received signals and noise signals, removes the noise signals by using a noise removal function from the acquired digital signals, and demodulates the signals. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
