| 摘要 |
PURPOSE:To prevent effectively fading, by providing a processor controlling the switching of each antenna and detecting the video and sound level in response to the number of antennas at this processor so as to select the best antenna by the sound and the video level. CONSTITUTION:Plural antenna elements 1 are arranged, any one of the elements 1 is selected with a high frequency switch 7 and the result is outputted to an output terminal 8. A tuner 2 is connected respectively to each element 1, an output of each tuner 2 is applied to a video detecting circuit 3 and a sound detecting circuit 11, and the level of a video signal and a sound signal detected at the circuits 3, 11 is detected respectively at level detecting circuit 4, 12. The output of the detecting circuits 4, 12 is applied to a discriminating processor 13, and a driving circuit 6 is controlled with a prescribed algorithm reserved in the processor 13. Further, the best antenna is selected by the video and sound level so as to prevent effectively the fading. |
