| 摘要 |
PURPOSE:To prevent the generation of a flicker phenomenon due to skew distortion by compensating the pulse width varied by the skew distortion. CONSTITUTION:If the 4th pulse of a horizontal synchronizing signal appears faster by the skew distortion, an edge pulse generating circuit 35 generates an edge pulse P5 to reset a pulse generating circuit 31 at the switching of a channel. Consequently, the pulse width t1 of a pulse P3 is synchronized with a pulse P5 and turned to an L level and the pulse width t1 is turned to t1''. Since a pulse P1 resets also a counter 32, no counted output is obtained from the counter 32. On the other hand, the pulse generating circuit 31 is actuated again by the 4th pulse of a horizontal synchronizing signal and the H level part with the time width t1 corresponding to the 4 pulses of the horizontal synchronizing signal appears in the pulse P3 again. Therefore, an upper flicker due to the skew distortion does not appear in a reproduced picture. |
