| 摘要 |
PROBLEM TO BE SOLVED: To convert the video signal of a nonstandard signal into a standard signal with a simple configuration. SOLUTION: The nonstandard signal and a write synchronizing signal are supplied to a memory controlling part 21 and the nonstandard signal is written to a memory 22 according to its own synchronizing signal. A read synchronizing signal is also supplied to the part 21 and the video signal written to the memory 22 is read according to the synchronizing signal of the standard signal. The write synchronizing signal and the read synchronizing signal are further supplied to a delay quantity detection circuit 23 for a write/read(W/R) synchronizing signal, and a time base deviation between the synchronizing signals is detected. When the deviation reaches a time corresponding to one frame or one field, a detection signal from the circuit 23 is supplied to the part 21, and overtaking takes place in a frame or field unit between writing and reading of a video signal in a memory 22.
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