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frekvensselektivt likstromkopplat videosignalreglersystem as you okensligt for likstromkomposanter in a video signal
frekvensselektivt likstromkopplat videosignalreglersystem as you okensligt for likstromkomposanter in a video signal
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机译:频率选择性直流耦合视频信号控制系统,因为您对视频信号中的直流分量不敏感
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摘要
A DC coupled system for automatically controlling the high frequency peaking content of a video signal is disclosed. The system includes a DC coupled control path comprising a peak detector for developing a control voltage representative of the high frequency content of the video signal exclusive of video signal DC components. The detector is preceded in the control path by a frequency selective network comprising an amplifier and a filter for shaping the frequency response of the control path such that high frequency video signal components exclusive of DC video signal components are passed to the peak detector. The frequency selective network comprises the cascode combination of a video signal amplifier transistor and a current source transistor which provides quiescent operating currents for the amplifier transistor. The filter is coupled to the junction of the amplifier and current source transistors, and includes a DC blocking network coupled between the junction and a point of reference potential.
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