| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for automatically adjusting a phase of a sampling clock to an optimal value without causing deterioration in picture quality such as blotting on a display picture. SOLUTION: In this method, processing, comprising a step (S3) for stopping writing a digital picture signal in frame memory after storing a present value px of the phase of the sampling clock as a 1st phase value, a step (S4) for setting the phase of the sampling clock to a 2nd phase value and sampling a fixed number of input video signals, a step (S5) for obtaining a phase data presenting a phase difference between the sampling clock and the input video signal from the sampled value, a step (S6) for resetting the phase of the sampling clock to the stored 1st phase value px and sampling the input video signal, and a step (7) for restarting writing in the frame memory, is repeatedly performed while increasing the 2nd phase value by a prescribed valueδ.
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