The PLL full synchronization video detector circuit is educed by feature and troubles of quasi-synchronization video detector.
由准同步视频检波的特点及其存在的问题引出锁相环（ PLL）完全同步视频检波电路。
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To the reliability of multi synchronization points of circuitry type and unit type, this paper studies a new technique about quasi-synchronization selector control based on PLC in hydropower station.
An Experimental Device for Automatic Quasi - synchronization of traditional using discrete components to achieve. It have large volume, speed and low accuracy.