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    Circuit for compensating the drift of the level of the direct current of a video signal
    2.
    发明公开
    Circuit for compensating the drift of the level of the direct current of a video signal 失效
    Schaltung zum Kompensieren der Drift des Gleichspannungspegels eines Videosignals。

    公开(公告)号：EP0651565A1

    公开(公告)日：1995-05-03

    申请号：EP94307998.8

    申请日：1994-10-31

    申请人： NEC CORPORATION

    发明人： Matsuo, Tomohide

    IPC分类号： H04N5/18

    CPC分类号： H04N5/185 ,  H04N5/18

    摘要： A first clamp circuit (2) clamps a tip of a synchronization signal of input video signal in accordance with a synchronization signal generated from a synchronization signal generator (3) and outputs a clamped video signal. A level detector (4) detects a level of a tip of a synchronization signal of the clamped video signal. A converter (5) converts the detected level to a reference level signal so that the greater the detected level becomes, the smaller the reference level signal becomes. A second clamp circuit (7) clamps the tip of the synchronization signal of the clamped video signal to the reference level signal and outputs an output video signal. Thus, the second clamp circuit compensates a remaining sag component included in the input video signal accurately.

    摘要翻译： 第一钳位电路（2）根据从同步信号发生器（3）产生的同步信号来钳位输入视频信号的同步信号的尖端，并输出钳位的视频信号。 电平检测器（4）检测钳位的视频信号的同步信号的尖端的电平。 A转换器（5）将检测到的电平转换为参考电平信号，使得检测电平变大，参考电平信号变得越小。 第二钳位电路（7）将钳位的视频信号的同步信号的尖端钳位到参考电平信号并输出​​输出视频信号。 因此，第二钳位电路准确地补偿包含在输入视频信号中的剩余下垂分量。