| 摘要 |
PURPOSE:To secure the display of the multi-sound broadcast on the TV screen via the control signal piled on the multi-sound broadcast signal. CONSTITUTION:The horizontal and vertical synchronous pulses given from synchronous isolation circuit 19 of the TV picture receiver are supplied to pulse generation circuit 20. Circuit 20 generates the pulse which gives projection of display 25 to part of TV screen 24. This pulse is applied to one transistor of the red or blue output of video output circuit 22 via switching circuit 21. This switching is performed by controlling circuit 21 via rectifier circuit 16 and 17 by the control signal showing the stereo and the multiple sound and detected through the known the known multi-sound circuit which is not shown in the figure. |
