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    • 9. 发明授权
    • Storage apparatus and position sensitivity setting method
    • 存储设备和位置灵敏度设置方法
    • US06556367B2
    • 2003-04-29
    • US09751096
    • 2000-12-28
    • Eisaku Takahashi
    • Eisaku Takahashi
    • G11B502
    • G11B5/59622
    • High-accuracy position signals are obtained by correcting nonlinear position sensitivities of two phase signals demodulated from two-phase servo information, into linear ones. A position sensitivity adjusting unit detects the signal level at the intersection of position signals N and Q having different phases by a predetermined track pitch which are demodulated from read signals of two-phase servo information buried and recorded in a disk medium and makes an adjustment of the gain of an AGC amplifier so that the intersection signal level coincides with a predetermined level. A sensitivity correcting unit corrects into linear position sensitivities the nonlinear position sensitivities approximated by sine functions or cosine functions relative to the actual track position X of the two position signals N and Q output from the AGC amplifier.
    • 通过将从两相伺服信息解调的两相信号的非线性位置灵敏度校正为线性位置信号来获得高精度位置信号。 位置灵敏度调整单元检测具有不同相位的位置信号N和Q的交点处的信号电平,该预定轨道间距是从埋入并记录在盘介质中的两相伺服信息的读取信号解调的,并进行调整 AGC放大器的增益使得交叉信号电平与预定电平一致。 灵敏度校正单元将相对于从AGC放大器输出的两个位置信号N和Q的实际轨道位置X相对于由正弦函数或余弦函数近似的非线性位置灵敏度校正为线性位置灵敏度。