公开(公告)号：US20120314321A1

公开(公告)日：2012-12-13

申请号：US13365098

申请日：2012-02-02

申请人： Hiroshi OYABU ,  Tatsuhiko KOSUGI ,  Kazuhiko TAKAISHI

发明人： Hiroshi OYABU ,  Tatsuhiko KOSUGI ,  Kazuhiko TAKAISHI

IPC分类号： G11B5/54

CPC分类号： G11B5/5547

摘要： According to one embodiment, a position demodulation method includes demodulating a first demodulation signal and a second demodulation signal having a phase difference of 90 degrees to the first demodulation signal based on a read-out signal obtained by reading out a servo pattern recorded on a medium by the head for positioning of a head with respect to the medium; correcting the first and second demodulation signals in which, when a trace of a Lissajous figure is drawn representing the first and second demodulation signals as values on coordinate axes different from each other on a plane, a ratio of respective lengths between intersections of the trace intersecting with two axes orthogonal at an origin of the plane is kept constant; and demodulating a positional signal for determining a position of the head based on the first and second demodulation signals after being corrected at the correcting.

摘要翻译： 根据一个实施例，位置解调方法包括基于通过读出记录在介质上的伺服模式而获得的读出信号来解调具有90度相位差的第一解调信号和第二解调信号与第一解调信号 通过头部相对于介质定位头部; 校正第一和第二解调信号，其中当绘制表示第一和第二解调信号的Lissajous图形的轨迹作为在平面上彼此不同的坐标轴上的值时，迹线的交点之间的相应长度的比率相交 在平面的原点处正交的两个轴保持恒定; 以及在校正后，基于所述第一和第二解调信号来解调用于确定所述头部的位置的位置信号。