| 摘要 |
PROBLEM TO BE SOLVED: To reduce the deterioration in reception performance in antenna switching in an on-board digital signal receiver. SOLUTION: The present invention relates to an on-board digital communication receiver which is mounted on a vehicle for receiving a radio wave modulated by a digital signal, including antenna means constituted of a plurality of antenna each with different directivity for switching the antennas to select any one of them in accordance with a reception status, wherein each of the antenna means controls antenna switching to gradually increase an attenuation rate of received signals from one antenna and to gradually decrease the attenuation rate of received signals from the other antenna means. COPYRIGHT: (C)2007,JPO&INPIT
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