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    • 2. 发明授权
    • Video signal processing apparatus with automatic picture quality control
function and signal processing circuit
    • 具有自动图像质量控制功能和信号处理电路的视频信号处理装置
    • US5436729A
    • 1995-07-25
    • US982557
    • 1992-11-27
    • Eiji MoroYukihiko Ozaki
    • Eiji MoroYukihiko Ozaki
    • G11B20/06H04N5/93H04N5/931H04N9/79H04N9/83H04N5/94H04N5/783
    • H04N5/9315H04N9/83H04N9/7921
    • A video signal processing apparatus with an automatic picture quality control function comprises a reproduction unit for reproducing a video signal from a video signal recording medium, an APL detector and a noise detector for detecting as a DC potential signal two different pieces of information affecting the picture quality contained in the video signal reproduced by the reproduction unit, a DC potential shift circuit for shifting the smaller of the two DC potential signals detected by the detectors in accordance with the reproduction mode of the reproduction apparatus, an input terminal for inputting a variable DC potential, a switching unit for selecting the output of the DC potential shift circuit or the input from the input terminal, and a picture quality control circuit for controlling the picture quality of the video signal reproduced at the reproduction apparatus by the DC potential from the switching unit.
    • 具有自动图像质量控制功能的视频信号处理设备包括用于再现来自视频信号记录介质的视频信号的再现单元,APL检测器和用于检测影响图像的两个不同信息的DC电位信号的噪声检测器 包含在由再现单元再现的视频信号中的质量; DC电位移位电路,用于根据再现设备的再现模式移动由检测器检测的两个DC电位信号中较小的一个;用于输入可变DC的输入端 电位,用于选择直流电位移位电路的输出或来自输入端的输入的切换单元,以及图像质量控制电路,用于通过来自切换的直流电位在再现设备处再现的视频信号的图像质量进行控制 单元。