It is required in capture of video to synchronize the digitizing process with the parameters of the video signal.
在捕获视频信号时，需要用视频信号的参数实现数字化过程的同步。
It is required in computer capture of video to synchronize the digitizing process with the scanning parameters of the video signal.
在计算机捕获视频信号时，需要用视频信号的扫描参数实现数字化过程的同步。
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