| 摘要 |
PROBLEM TO BE SOLVED: To exclude a repeat field from a field composite processing object only by adding simple hardware logic and to display a smooth image without fadering on a display monitor of a computer. SOLUTION: A mask circuit 503 of a DVD decoder 112 inputs a repeat first field flag register (Rep-Reg) 112b in every Vsync that is outputted from a video port control circuit 502 and when a repeat first field flag = '1', it masks Vsync and Hsync which correspond to the next field. It automatically frees the mask when the next Vsync comes. A VGA controller 113 does not capture video data while the Vsync and Hsync are masked. Then, a repeat field is easily excluded from a field composite processing object. |
