| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication control unit which can improve the reliability of mutual communication to and from a portable unit without modifying the hardware thereof. <P>SOLUTION: When an in-vehicle control section 32 outputs an in-vehicle driving signal to an in-vehicle transmission circuit 120, the in-vehicle control section 32 outputs a dissimilar signal to an out-vehicle transmission circuit 110. As a result, a radio signal (in-vehicle request signal) that can be received by the portable unit 41 is transmitted from an in-vehicle antenna 121, and a radio signal (dissimilar radio signal) that cannot be received by the portable unit 41 is transmitted from an out-vehicle antenna 111. Therefore the dissimilar radio signal based on the dissimilar signal is actively transmitted from the out-vehicle antenna 111, and transmission of inducing radio waves from the out-vehicle antenna 111 is prevented. The dissimilar radio signal based on the dissimilar signal cannot be received by the portable unit 41, and therefore the portable unit 41 does not respond to the dissimilar radio signal based on the out-vehicle transmission circuit 110. <P>COPYRIGHT: (C)2007,JPO&INPIT |
