| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent interference of radio waves transmitted from a plurality of portable transmitters even through the transmitters simultaneously receive search signals. SOLUTION: A transmitter 2 discriminates the coincidence between an ID code inherent to a receiver 1 and a previously registered ID code inherent to a remote receiver 1 with the use of a microcomputer 25, and if they are coincident with each other as a result of the discrimination, signals including an ID core inherent to the transmitter 2 are transmitted.</p> |
