| 摘要 |
PURPOSE:To ensure the automatic reception in the best condition while the service areas of plural stations which transmit the same program are moving, by extracting the wave detection output of a signal receiver which is receiving a station having a higher receiving level among the output signals showing the same program. CONSTITUTION:A signal receiver 13 synchronizes with either one of the stations and transmits a wave detecting signal S1. In this case, if a signal receiver 14 synchronizing with another station transmits a wave detection signal S2, this signal S2 is supplied to a subtractor circuit 17 and an adder circuit 18 through BPF15 and 16 respectively. Here the full-wave rectification is given to the output of the circuit 18 through a rectifying circuit 22, and the division is controlled in terms of DC to prevent the decision from affected by the modulation factor. After this division, a decision output circuit 24 transmits the program received by two receivers to a control circuit 26 by the signal of ''1'' or ''0''. The circuit 26 delivers the wave detection output of the receiver which is receiving the station of a higher receiving level from a terminal 29 via a switching circuit 25 in the case of the same program. |
