| 摘要 |
PROBLEM TO BE SOLVED: To obtain an output with high quality by not selecting a signal from a transmission line where many errors are in existence. SOLUTION: In each of reception systems A, B, an RF reception section receiving a signal outputs an RSSI signal denoting the reception strength of the received signal, a unique word detection section outputs a UW signal denoting whether or not a received signal is synchronous, and an error detection/error rate detection section outputs a BER signal denoting the error rate of the received digital signal to an evaluation section 7. The evaluation section 7 outputs a switching control signal Sc to a reception system changeover section 8 to select the output of an excellent reception system when the section 7 detects signals from the excellent reception system that satisfies conditions where the UW signal denotes that synchronization is established, the RSSI signal has a prescribed reference level or over, the BER signal has a prescribed reference level or below and the level of the BER signal is not higher than the level of the BER signal from the other reception system. Thus, a speaker 9 can output signals only from the excellent transmission line.
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