| 摘要 |
PROBLEM TO BE SOLVED: To delay the vertical synchronizing signal of a signal whose vertical synchronizing signal interval differs for each field of a field double scan signal so that the signal is correctly scanned. SOLUTION: A vertical synchronizing signal VD of a field double scan signal inputted from an input terminal 15 is delayed by nearly a two-vertical period at monostable multivibrators 11-14 into a pseudo vertical synchronizing signal VD and it is outputted from an output terminal 16 and a vertical deflection voltage is generated based on the pseudo vertical synchronizing signal VD and the field double scanning signal is scanned. Thus, since the respective period of the long/short pseudo vertical synchronizing signal VD is matched with a period of the video image (pattern) of the field double scanning signal, the scanning lines of the video image of the signals whose interval of the vertical synchronizing signals is different from each field such as the field double scanning signal are not overlapped and correct scanning is conducted. |
