The input video is now fixed at a stable DC level where the blank level is set to a known ADC code.

现在，输入视频固定在稳定的直流电平，消隐电平则设定为已知的ADC代码。

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More particularly, the number of sustain pulses within the video frame and selected by the power level mode is modified as a function of the input frame frequency.

更具体地，按照输入帧频率的函数来修改视频帧内的维持脉冲数。

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