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    • 6. 发明授权
    • Method and apparatus for measuring off-track detection sensitivity
    • 用于测量离轨检测灵敏度的方法和装置
    • US07623419B2
    • 2009-11-24
    • US10768623
    • 2004-01-30
    • Yasuo Nakata
    • Yasuo Nakata
    • G11B7/085
    • G11B7/00375G11B7/002G11B7/08517G11B7/0946
    • An off-track duty measurement unit measures off-track detection sensitivity on the basis of an off-track signal, and track cross cycle information that is obtained from a tracking error signal measured by a track cross cycle measurement unit, whereby off-track detection sensitivity can be measured more accurately. Further, an off-track detection sensitivity controller changes the detection sensitivity of an off-track signal detector according to the obtained off-track detection sensitivity, whereby the off-track sensitivity can be kept constant for various kinds of discs, and accordingly, stabilities of off-track detection, track pull-in judgement, and track jumping can be secured.
    • 离轨占空比测量单元基于偏离轨道信号来测量偏离轨迹检测灵敏度,并且跟踪由轨道交叉循环测量单元测量的跟踪误差信号获得的交叉循环信息,由此进行离轨检测 灵敏度可以更准确地测量。 此外,偏离磁道检测灵敏度控制器根据获得的偏离磁道检测灵敏度改变偏离磁道信号检测器的检测灵敏度,从而可以使各种光盘的偏离磁道灵敏度保持不变,因此,稳定性 可以确保偏离轨迹检测,轨迹拉入判断和轨道跳跃。