| 摘要 |
PROBLEM TO BE SOLVED: To obviate need for filters and amplifiers to be provided for each of plural antennas, and prevent demodulated outputs from being influenced in antenna selection. SOLUTION: A level detectors 2a and 2b detect levels La and Lb of received signals, inputted from plural antennas 1a and 1b via plural input terminals 10a and 10b. A selector 3 is controlled by a selection controller 7 to select either of the signals from plural antennas 1a and 1b. An input filter 4 and amplifier 5 amplifiers the selected signal to the predetermined level. A demodulator 6 demodulates the outputs of the amplifier 5 and outputs a timing signal Pt, indicating a period of each of time-shared data. The selection controller 7 generates a selection signal Sc, which allows the selection of an antenna of the maximum signal level, to issue it to the selector 3 at an interval between data of the time-shared signal, based on signal levels La and Lb and on the timing signal Pt.
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