| 摘要 |
PURPOSE:To reduce a transmitting cost by superimposing a direct current voltage in which a voltage level is changed correspondingly to a control signal on a high frequency video signal transmission path. CONSTITUTION:The direct current voltage VDC in which the voltage level is changed corresponding to the control signal of an auxiliary equipment 7 is superimposed on the high frequency video signal transmission path 2 consisting of the moving cable path, such as a trolley duct for transmitting the high frequency video signal VS inputted and outputted by a video equipment 6. Thereby, the high frequency video signal VS and the control signal of the auxiliary equipment are overlapped by the single high frequency video signal transmission path 2 to be transmitted, and the high frequency video signal transmission path 2 can be shared for transmitting the high frequency video signal VS and for transmitting the control signal, the number of wirings can be deleted, a high frequency transmission modem is not required and the cost can be reduced.
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