| 摘要 |
PURPOSE:To selectively receive a disired broadcasting by controlling the selection of a broadcasting signal by means of the voltage level of a converter power source and a control pulse. CONSTITUTION:BS/CS receivers 17-20 output the converter power source with signal cables 13-16 when the power source is turned on. The receivers 17-20 can select the five kinds (BS broadcasting, the horizontal polarization broadcasting, etc.) of broadcastings by a broadcasting selecting switch. The selection information is inputted to a power source voltage converting circuit and a pulse code circuit and is converted into the voltage level (+15V, +11V) of the converter power source and the control pulse so that the converter power source and the control pulse superposed on it are outputted through the cables 13-16. Then, the voltage level of the converter power source is two stages so that there is little fear of an malfunction. Thus, the desired broadcasting is selectively received by only connecting the switching distributor with the receiver by the one signal cable.
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