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    • 1. 发明授权
    • Vertical synchronizing signal generation apparatus and video signal processing apparatus
    • 垂直同步信号发生装置和视频信号处理装置
    • US07199834B2
    • 2007-04-03
    • US10480235
    • 2002-06-07
    • Kunihiko FujiiToshihiro MiyoshiKazuhide FujimotoManabu YumineToshiya Noritake
    • Kunihiko FujiiToshihiro MiyoshiKazuhide FujimotoManabu YumineToshiya Noritake
    • H04N5/06H04N5/95
    • H04N5/12H04N5/10
    • The vertical sync signal generator includes: a vertical sync signal separation circuit for separating a vertical sync signal of an input luminance signal and outputting the separated signal as a first vertical sync signal; an automatic frequency control circuit for generating a second vertical sync signal having a repeat frequency corresponding with an average repeat frequency of the first vertical sync signal and outputting the generated signal; a vertical sync signal phase detection circuit for detecting whether or not the first vertical sync signal has two different periods repeated alternately and outputting the detection result as a decision signal; and a selector for receiving the first and second vertical sync signals, selecting the first vertical sync signal when the decision signal indicates that the first vertical sync signal has two different periods repeated alternately and otherwise selecting the second vertical sync signal and outputting the selected signal.
    • 垂直同步信号发生器包括:垂直同步信号分离电路,用于分离输入亮度信号的垂直同步信号并输出​​分离信号作为第一垂直同步信号; 自动频率控制电路,用于产生具有与第一垂直同步信号的平均重复频率对应的重复频率的第二垂直同步信号,并输出所产生的信号; 垂直同步信号相位检测电路,用于检测第一垂直同步信号是否具有交替重复的两个不同周期,并将检测结果作为判定信号输出; 以及选择器,用于接收第一和第二垂直同步信号,当判定信号指示第一垂直同步信号具有交替重复的两个不同周期时,选择第一垂直同步信号,否则选择第二垂直同步信号并输出​​所选择的信号。