| 摘要 |
PURPOSE:To prevent the producting of color out of synchronism, even if the screen size is reduced, by the chroma tuning through the use of output signal corresponding to the index signal having broad pulse width from index and stripe of broad width as a trigger signal. CONSTITUTION:When an index signal a obtained from scanning a face plate inside is input to a terminal 6 and a pulse voltage waveform b obtained through a switching circuit 17 is fed to transistors 19, 20, a collector voltage waveform c of the transistor 20 changes as triangle shape. This voltage is clipped with a voltage V1, and a clip voltage waveform d is obtained, wave-shape is made at a switching circuit 30, and a pulse voltage e is obtained at a terminal 31. Accordingly, since this information includes only the information of broad width index and strip, correct chroma synchronism is taken by using this signal as a synchronizing trigger signal. |
