公开(公告)号：US06510015B2

公开(公告)日：2003-01-21

申请号：US09726786

申请日：2000-11-30

申请人： Alexei H. Sacks ,  Timothy F. Ellis ,  Patrick J. Korkowski ,  Karl A. Belser

发明人： Alexei H. Sacks ,  Timothy F. Ellis ,  Patrick J. Korkowski ,  Karl A. Belser

IPC分类号： G11B2102

CPC分类号： B82Y10/00 ,  G11B5/59633 ,  G11B5/59655 ,  G11B5/74 ,  G11B5/743 ,  G11B5/82 ,  G11B21/025

摘要： A magnetic medium comprises a magnetic disc having a read surface that has a plurality of tracks, at least some having servo sectors. The servo sectors comprise a plurality of magnetic irregularities, such as pits or regions of reduced magnetic coercivity, arranged in a servo pattern along the servo sector at a servo frequency. A magnetic pattern is recorded in the disc along the servo sector at a high carrier frequency. A process for manufacturing the servo pattern and for recovering servo data from the servo pattern are also described.

摘要翻译： 磁介质包括具有读表面的磁盘，该磁盘具有多个轨道，至少一些具有伺服扇区。 伺服扇区包括以伺服频率沿着伺服扇区布置在伺服模式中的多个磁性不规则性，例如凹陷或减小的磁矫顽力的区域。 沿着伺服扇区以高载波频率在磁盘中记录磁图案。 还描述了用于制造伺服模式并用于从伺服模式恢复伺服数据的处理。

公开(公告)号：US06426845B1

公开(公告)日：2002-07-30

申请号：US09268012

申请日：1999-03-15

申请人： Alexei H. Sacks ,  Timothy F. Ellis

发明人： Alexei H. Sacks ,  Timothy F. Ellis

IPC分类号： G11B5596

CPC分类号： G11B21/081 ,  G11B5/5552 ,  G11B5/59655

摘要： An asynchronous demodulator and method is provided which determines a position error of a read head relative to a position on a medium in a storage device. The read head generates a-read signal as the read head passes over a servo area on the medium. The demodulator generates a normal demodulating signal that is asynchronous with the read signal and a quadrature demodulating signal that is ninety degrees out of phase with the normal demodulating signal. The read signal is multiplied by the normal demodulating signal and the quadrature demodulating signal to produce a normal position signal and a quadrature position signal. The demodulator produces a position error magnitude and a position error direction based on the normal position signal and the quadrature position signal.

摘要翻译： 提供一种异步解调器和方法，其确定读取头相对于存储设备中介质上的位置的位置误差。 读头在读取头通过介质上的伺服区域时产生读取信号。 解调器产生与读取信号异步的正常解调信号和与正常解调信号相差90度的正交解调信号。 读取信号乘以正常解调信号和正交解调信号，以产生正常位置信号和正交位置信号。 解调器基于正常位置信号和正交位置信号产生位置误差幅度和位置误差方向。

公开(公告)号：US06195220B1

公开(公告)日：2001-02-27

申请号：US09268118

申请日：1999-03-15

申请人： Timothy F. Ellis ,  Alexei H. Sacks

发明人： Timothy F. Ellis ,  Alexei H. Sacks

IPC分类号： G11B5596

CPC分类号： G11B21/081 ,  G11B5/5552 ,  G11B5/59655

摘要： A method of generating a position error estimate generates a phase field signal and a position error field signal. A set of operations is performed on the phase field signal and the same set of operations is performed on the position error field signal. The result obtained by performing the set of operations on the position error field signal is divided by the results obtained by performing the set of operations on the phase field signal. The result of the division is the position error estimate. In addition, a demodulation circuit is provided that utilizes field ratioing.

摘要翻译： 产生位置误差估计的方法产生相位场信号和位置误差场信号。 对相位场信号执行一组操作，并对位置误差场信号执行相同的一组操作。 通过对位置误差场信号执行一组操作而获得的结果除以通过对相位场信号执行一组操作获得的结果。 除法的结果是位置误差估计。 此外，提供利用场比的解调电路。

公开(公告)号：US06181505B2

公开(公告)日：2001-01-30

申请号：US09268009

申请日：1999-03-15

申请人： Alexei H. Sacks ,  Timothy F. Ellis

发明人： Alexei H. Sacks ,  Timothy F. Ellis

IPC分类号： G11B5596

CPC分类号： G11B20/10009 ,  G11B5/59605 ,  G11B5/59688 ,  G11B21/083 ,  G11B21/10 ,  G11B2020/10888

摘要： A synchronous digital demodulator and method for demodulating a read signal including a user data waveform and a servo waveform which are generated by a read head as the read head passes over a user data area and a servo area, respectively, on a medium in a storage device. The user data waveform is converted to a series of digital user data values at a user data sample rate. The series of digital user data values are then applied to a user data detector circuit. The servo waveform is converted to a series of digital servo values at a servo sample rate, which is independent from the user data sample rate. The series of digital servo values are demodulated synchronously with the servo waveform to produce a position error value indicative of a position error of the read head relative to a location on the medium.

摘要翻译： 一种用于解调包括用户数据波形和伺服波形的读取信号的同步数字解调器和方法，读取头分别在存储器中的介质上经过用户数据区域和伺服区域，由读取头产生 设备。 以用户数据采样率将用户数据波形转换成一系列数字用户数据值。 然后将一系列数字用户数据值应用于用户数据检测器电路。 伺服波形以伺服采样率转换为一系列数字伺服值，与用户数据采样率无关。 一系列数字伺服值与伺服波形同步解调，产生一个位置误差值，该位置误差值表示读取头相对于介质上位置的位置误差。

公开(公告)号：US06249392B1

公开(公告)日：2001-06-19

申请号：US09078179

申请日：1998-05-13

申请人： Alexei H. Sacks ,  Timothy F. Ellis

发明人： Alexei H. Sacks ,  Timothy F. Ellis

IPC分类号： G11B2736

CPC分类号： G11B20/10203 ,  G11B5/5534 ,  G11B5/59611 ,  G11B5/59688 ,  G11B19/04 ,  G11B27/36 ,  G11B2005/0013 ,  G11B2005/0016

摘要： A method and apparatus detects pulse asymmetries in a read signal of a data storage device. The read signal is rectified through multiplication with a rectification signal to produce a product signal. The product signal is integrated to produce integrands indicative of pulse asymmetry. In some embodiments of the present invention, the integrands are compared against a baseline value to determine a performance characteristic of a read head in the data storage device.

摘要翻译： 一种方法和装置检测数据存储装置的读取信号中的脉冲不对称性。 读取信号通过与整流信号相乘来整流以产生乘积信号。 产品信号被集成以产生指示脉冲不对称的被占据。 在本发明的一些实施例中，将被积函数与基线值进行比较以确定数据存储设备中的读头的性能特性。

公开(公告)号：US06469849B1

公开(公告)日：2002-10-22

申请号：US09655479

申请日：2000-09-05

申请人： Timothy F. Ellis ,  Alexei H. Sacks

发明人： Timothy F. Ellis ,  Alexei H. Sacks

IPC分类号： G11B502

CPC分类号： G11B21/081 ,  G11B5/5552 ,  G11B5/59655

摘要： A method of generating a position error estimate generates a phase field signal and a position error field signal. A set of operations is performed on the phase field signal and the same set of operations is performed on the position error field signal. The result obtained by performing the set of operations on the position error field signal is divided by the results obtained by performing the set of operations on the phase field signal. The result of the division is the position error estimate. In addition, a demodulation circuit is provided that utilizes field ratioing.

摘要翻译： 产生位置误差估计的方法产生相位场信号和位置误差场信号。 对相位场信号执行一组操作，并对位置误差场信号执行相同的一组操作。 通过对位置误差场信号执行一组操作而获得的结果除以通过对相位场信号执行一组操作获得的结果。 除法的结果是位置误差估计。 此外，提供利用场比的解调电路。

公开(公告)号：US06327108B1

公开(公告)日：2001-12-04

申请号：US09017442

申请日：1998-02-02

申请人： Timothy F. Ellis ,  Alexei H. Sacks

发明人： Timothy F. Ellis ,  Alexei H. Sacks

IPC分类号： G11B5035

CPC分类号： G11B20/10203 ,  G11B5/5534 ,  G11B5/59611 ,  G11B5/59688 ,  G11B19/04 ,  G11B27/36 ,  G11B2005/0013 ,  G11B2005/0016

摘要： A method and apparatus detects and filters pulse asymmetries in a read signal of a data storage device. A value indicative of the difference between the shape of a pulse from its first zero crossing to its peak and the shape of the pulse from its second zero crossing to its peak is determined. This value is minimized by adjusting at least one filter characteristic of a read signal filter.

摘要翻译： 方法和装置检测和滤波数据存储装置的读取信号中的脉冲不对称。 确定表示从其第一零交叉到其峰值的脉冲的形状与从其第二过零点到其峰值的脉冲的形状之间的差异的值。 通过调整读取信号滤波器的至少一个滤波器特性来最小化该值。

公开(公告)号：US06243224B1

公开(公告)日：2001-06-05

申请号：US09268584

申请日：1999-03-15

申请人： Alexei H. Sacks ,  Timothy F. Ellis

发明人： Alexei H. Sacks ,  Timothy F. Ellis

IPC分类号： G11B5596

CPC分类号： G11B5/59655 ,  G11B5/5552 ,  G11B5/59688

摘要： An asynchronous demodulator and method is provided which determines a position error of a read head relative to a position on a medium in a storage device. The read head generates a read signal as the read head passes over a servo area on the medium. The demodulator generates a normal demodulating signal that is asynchronous with the read signal and a quadrature demodulating signal that is ninety degrees out of phase with the normal demodulating signal. The read signal is sampled to produce a series of digital read values which are multiplied by the normal demodulating signal and the quadrature demodulating signal to produce a plurality of normal and quadrature sample values. The demodulator produces the a position error magnitude and a position error direction based on the plurality of normal and quadrature sample values.

摘要翻译： 提供一种异步解调器和方法，其确定读取头相对于存储设备中介质上的位置的位置误差。 当读取头通过介质上的伺服区域时，读取头产生读取信号。 解调器产生与读取信号异步的正常解调信号和与正常解调信号相差90度的正交解调信号。 读取信号被采样以产生一系列数字读取值，该数字读取值与正常解调信号和正交解调信号相乘以产生多个正常和正交样本值。 解调器基于多个正交和正交采样值产生位置误差幅度和位置误差方向。

公开(公告)号：US06882487B2

公开(公告)日：2005-04-19

申请号：US10183680

申请日：2002-06-27

申请人： Reed D. Hanson ,  Timothy F. Ellis ,  Dustin M. Cvancara ,  Nathaniel B. Wilson

发明人： Reed D. Hanson ,  Timothy F. Ellis ,  Dustin M. Cvancara ,  Nathaniel B. Wilson

IPC分类号： G11B5/55 ,  G11B5/596 ,  G11B27/30 ,  G11B19/247

CPC分类号： G11B5/5534 ,  G11B5/59627

摘要： An apparatus and method for compensating for variation in sample rate in a disc drive having a rotating disc and a head that is positioned over the rotating disc is provided. The disc includes at least one track that has multiple consecutive sectors. A sample rate value between timing marks of each pair of consecutive sectors of the multiple consecutive sectors is computed to obtain a sequence of sample rate values. A sequence of timing error values is computed as a function of the sequence of sample rate values and a nominal sample rate value. Data related to the sequence of timing error values is utilized to compensate for variation in sample rate values.

摘要翻译： 提供了一种用于补偿具有旋转盘和位于旋转盘上的头的盘驱动器中的采样率变化的装置和方法。 盘包括具有多个连续扇区的至少一个轨道。 计算多个连续扇区的每对连续扇区的定时标记之间的采样率值，以获得采样率值序列。 根据采样率值和标称采样率值的顺序计算定时误差值序列。 利用与定时误差值序列有关的数据来补偿采样率值的变化。

公开(公告)号：US06392834B1

公开(公告)日：2002-05-21

申请号：US09394756

申请日：1999-09-13

申请人： Timothy F. Ellis

发明人： Timothy F. Ellis

IPC分类号： G11B5596

CPC分类号： G11B21/106 ,  G11B5/59627

摘要： Disclosed are a method and apparatus for compensating for written-in repeatable run-out in a disc drive. A written-in repeatable run-out compensation value is stored in a servo field residing on a track. The compensation value is subtracted from a corresponding servo value to obtain a compensated servo value. The head is positioned relative to the track based upon the compensated servo value. Also disclosed is a method for determining the written-in repeatable run-out compensation values wherein the head is positioned over the intended center of the track so that the head follows an essentially circular path relative to the disc surface. For each revolution of the disc, a servo value indicating the position of the head relative to the track at the servo field is determined. The servo values are averaged over a number of revolutions in order to extract a non-repeatable portion of the run-out.

摘要翻译： 公开了用于补偿盘驱动器中的可写入可重复耗尽的方法和装置。 写入可重复的耗尽补偿值存储在驻留在轨道上的伺服字段中。 从相应的伺服值中减去补偿值，以获得补偿的伺服值。 基于补偿的伺服值，头部相对于轨道定位。 还公开了一种用于确定可写入的可重复耗尽补偿值的方法，其中头部位于轨道的预期中心上方，使得头部相对于盘表面遵循基本圆形的路径。 对于盘的每次旋转，确定指示磁头相对于伺服磁场的磁道的位置的伺服值。 伺服值在多次转数之间进行平均，以便提取出不可重复的部分。