| 摘要 |
PROBLEM TO BE SOLVED: To provide a video signal processor compatible with multi-scanning by which a dot clock is adjusted so as to enable a user to easily acquire an optimum image without providing a special function to a video output device. SOLUTION: A counter 1 counts the number of horizontal synchronization signals within one vertical synchronization period and obtains the number of vertical lines. A microcomputer 3 sets the frequency division ratio of a PLL circuit 4 by multiplying the number of the vertical lines by a coefficient value based on a predetermined aspect ratio and generates the approximate dot clock. An image for adjustment is read from an image memory 6 by the generated dot clock and displayed on a monitor. Then the dot clock is adjusted by operating an image adjustment button 10. COPYRIGHT: (C)2005,JPO&NCIPI
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