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    • 2. 发明授权
    • Digital data recovery circuit
    • 数字数据恢复电路
    • US4626911A
    • 1986-12-02
    • US601675
    • 1984-04-18
    • Takayuki SasakiEiichi Ichimura
    • Takayuki SasakiEiichi Ichimura
    • G11B20/00G11B27/30H03L7/08H03L7/087H04L27/227H04N9/79H04N9/82H04N9/87H04N7/04H04N5/04
    • H04L27/2275G11B27/3045H03L7/087H04N9/79H04N9/82H04N9/8233H04N9/87G11B2220/20
    • A digital data recovery circuit for recovering digital data recorded on a magnetic record medium along with still-image video signals in a frequency mulitplexed relationship employs two phase-control-loops, in which the first loop corrects absolute or DC phase errors and the second phase-control-loop corrects AC phase errors evidenced as abrupt phase shifts of the digital data signal caused by changes in rotation of the magnetic record by using a horizontal synchronization signal derived from the video signal, and in which the outputs of loop filters included in the first and second phase-control loops, respectively, are combined to provide a control signal for a voltage controlled oscillator that provides a demodulating carrier signal so that a synchronous detector can detect the digital data signal, thereby to cause the synchronous detector to lock onto even abrupt phase shifts in the carrier of the digital data signal.
    • 用于恢复记录在磁记录介质上的数字数据的数字数据恢复电路与频率复合关系中的静止图像视频信号一起使用两个相位控制环路,其中第一环路校正绝对或DC相位误差,第二相位 控制回路通过使用从视频信号导出的水平同步信号来校正由磁记录的旋转变化引起的数字数据信号的突然相移的AC相位误差,其中包括在 组合第一和第二相位控制回路以提供用于提供解调载波信号的压控振荡器的控制信号,使得同步检测器可以检测数字数据信号,从而使同步检测器锁定到偶数 数字数据信号载波中的突变相移。