| 摘要 |
PROBLEM TO BE SOLVED: To speedily detect a synchronizing signal without receiving influence from the level of a video signal. SOLUTION: A plural threshold binary transforming circuit 16 transforms a digital signal outputted by an A/D converter 3 to a binary signal by plural thresholds. A signal combining circuit 17 combines plural signals fed from the circuit 16 to output it as one binary signal. A frame synchronization detecting circuit 7 detects a frame synchronization signal included in the output of the signal combining circuit 17.
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