positive picture signal
更多时候还需要计算机显卡产生一个正极性触发的同步信号，它会通知显示终端所显示的图像行频已经改变到一个新的格式了。
Most will recall that COMPUTER graphic CARDS sometimes OUTPUT positive-going sync. Positive-going sync signal the DISPLAY that the graphics LINE rate has changed to a new format.
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