| 摘要 |
PROBLEM TO BE SOLVED: To optimize the discrimination sensitivity of a video signal of a 24-frame source included in a 60-frame interlace signal. SOLUTION: The pull-down detection circuit detects a total time DT when 24-frame discrimination signals C outputted from a 24-frame discrimination circuit 10 are logical "1" for thirty seconds in the past (discrimination of 24-frame source), and a sensitivity reference value setting circuit 20 determines a sensitivity reference value REF of a comparator 13 in response to the time DT. When the time DT is greater, the REF is selected smaller and when the time DT is smaller, the REF is selected greater. COPYRIGHT: (C)2006,JPO&NCIPI
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