| 摘要 |
PURPOSE:To accurately correct the position of a display image in accordance with the difference of each television(TV) system by varying the writing timing of a field memory correspondingly to a steady phase error generated in a PLL circuit in accordance with the difference of each TV system. CONSTITUTION:In a field double speed aspect conversion circuit 3, an input luminance signal Yin is written in the 1st field memory 12. Inputted color difference signals R-Yin, B-Yin are respectively written in field memories 22, 23. The circuit 3 includes a line clock PLL circuit 40, which generates a writing side system clock WCK and supplies the clock to respective memories 12, 22, 32. The writing timing of the memories 12, 22, 32 is changed correspondingly to a steady phase difference error generated in the circuit 40 due to the difference of each TV system. |
