| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a field is erroneously discriminated when the change point of vertical synchronizing signals shifts from an estimated timing by 25% of one line or more in forming the window of 25% to 75% of 1H and discriminating the field depending on whether or not horizontal synchronizing signals are present in the window. SOLUTION: A normal mode, a special mode and a non-signal mode are discriminated in a mode discrimination circuit 29 by using the window generated in a window generation circuit 28. When the discriminated result is the special mode, the next field is predicted on the basis of past field information by a field information generation circuit 30, a processing corresponding to the field is executed in a corrected vertical synchronizing signal generation circuit 31, and corrected vertical synchronizing signals (corrected vres) are generated. COPYRIGHT: (C)2004,JPO
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