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    Digital servo control system including sample integrity tester for reducing effects of spurious sampled position values
    1.
    发明授权
    Digital servo control system including sample integrity tester for reducing effects of spurious sampled position values 失效
    数字伺服控制系统包括采样完整性测试仪，用于减少杂散采样位置值的影响

    公开(公告)号：US5914830A

    公开(公告)日：1999-06-22

    申请号：US978489

    申请日：1997-11-25

    申请人： Ronald James Kadlec ,  Paul Henry Kelley ,  Philip Saxton Weilbacher

    发明人： Ronald James Kadlec ,  Paul Henry Kelley ,  Philip Saxton Weilbacher

    IPC分类号： G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10

    CPC分类号： G11B5/59622 ,  G11B21/081 ,  G11B21/085 ,  G11B21/10 ,  G11B5/5534 ,  G11B5/5547 ,  G11B5/59616 ,  G11B5/5965

    摘要： In a digital servo control system especially suitable for use in disk drives, a sample integrity tester is provided. Sample measurements, indicating the position of a disk drive's read/write head relative to tracks of information on a recording medium, are subject to error due to noise. The sample integrity tester 2410, 2420, 2430 effectively filters out noise-corrupted measurements and thus prevents clearly erroneous measurements from contaminating calculations performed within the servo controller's control loop. If a measured position signal falls outside a given window (indicating a possible spurious position value has been read), an observer's predicted value is used rather than the spurious value. Using the predicted value allows the loop to operate in a "freewheel" (open-loop) mode. A preferred implementation of the sample integrity tester involves a coarse window that is static, and a fine window that changes dynamically based on an effort signal.

    摘要翻译： 在特别适用于磁盘驱动器的数字伺服控制系统中，提供了一个样本完整性测试器。 表示磁盘驱动器的读/写头相对于记录介质上的信息的轨迹的位置的样本测量将由于噪声而出现错误。 样品完整性测试器2410,2420,2430有效地滤除噪声损坏的测量值，从而防止在伺服控制器的控制回路内执行污染的清楚的错误测量。 如果测量的位置信号落在给定窗口之外（指示可能的寄生位置值已被读取），则使用观察者的预测值而不是伪造值。 使用预测值可以使循环以“续流”（开环）模式运行。 样本完整性测试器的优选实施方案涉及静态的粗略窗口，以及基于努力信号而动态改变的精细窗口。

    Digital servo control system for use in disk drives
    2.
    发明授权
    Digital servo control system for use in disk drives 失效
    用于磁盘驱动器的数字伺服控制系统

    公开(公告)号：US06347018B1

    公开(公告)日：2002-02-12

    申请号：US09303597

    申请日：1999-05-03

    申请人： Ronald James Kadlec ,  Thomas James Frederick ,  Paul Henry Kelley ,  Philip Saxton Weilbacher

    发明人： Ronald James Kadlec ,  Thomas James Frederick ,  Paul Henry Kelley ,  Philip Saxton Weilbacher

    IPC分类号： G11B5596

    CPC分类号： G11B5/59622 ,  G11B5/5534 ,  G11B5/5547 ,  G11B5/59616 ,  G11B5/5965 ,  G11B21/081 ,  G11B21/085 ,  G11B21/10

    摘要： A digital servo control system for disk drives is an “embedded” system—one in which servo control information is embedded on the same disk surface as the user data. In contrast to known embedded-servo systems in which a space-consuming series of many dibit pairs is present, the present system provides only a single dibit pair in a fractional positional error (PESF) area. Thus, the disk drive's read head encounters only a single dibit pair per sample period (or per data sector), thus saving valuable disk space that may be used for user data. Various pre-processing methods may be provided so as to pre-process the measurement derived from the single dibit pair per sample period (or data sector), so as to compensate for non-ideal characteristics of the dibit measurement. The system thus provides an accurate and robust servo control system, while sacrificing a minimum amount of valuable disk space to the servo information field.

    摘要翻译： 用于磁盘驱动器的数字伺服控制系统是一种“嵌入式”系统，其中伺服控制信息嵌入与用户数据相同的磁盘表面上。 与众所周知的嵌入式伺服系统相比，其中存在许多双数对的空间消耗系列，本系统在分数位置误差（PESF）区域中仅提供单个双位对。 因此，磁盘驱动器的读取头在每个采样周期（或每个数据扇区）仅遇到单个双位对，从而节省了可用于用户数据的宝贵磁盘空间。 可以提供各种预处理方法，以便对每个采样周期（或数据扇区）从单个双位对导出的测量进行预处理，以补偿双位测量的非理想特性。 因此，该系统提供了精确和鲁棒的伺服控制系统，同时牺牲了伺服信息领域的最小量的有价值的磁盘空间。

    Digital servo control system for use in disk drives, including calibrated controller for fixed-distance seeks
    3.
    发明授权
    Digital servo control system for use in disk drives, including calibrated controller for fixed-distance seeks 失效
    用于磁盘驱动器的数字伺服控制系统，包括用于固定距离寻找的校准控制器

    公开(公告)号：US5914829A

    公开(公告)日：1999-06-22

    申请号：US457235

    申请日：1995-06-01

    申请人： Ronald James Kadlec ,  Paul Henry Kelley ,  Thomas James Frederick

    发明人： Ronald James Kadlec ,  Paul Henry Kelley ,  Thomas James Frederick

    IPC分类号： G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10

    CPC分类号： G11B5/59622 ,  G11B21/081 ,  G11B21/085 ,  G11B21/10 ,  G11B5/5534 ,  G11B5/5547 ,  G11B5/59616 ,  G11B5/5965

    摘要： In a servo controller for controlling the position of a read/write head of a disk drive, a calibrated controller is dedicated to fixed-distance seeks, especially for "single-track seeks" (seeks to an immediately-adjacent track). The controller is first calibrated during a calibration period that precedes an operational period. The purpose of the calibration period is to determine an optimum combination of "calibrated values" for the fixed-distance seeks. "Calibrated values" may include: acceleration pulse magnitude, acceleration pulse duration, deceleration pulse magnitude, and deceleration pulse duration. During the calibration period, various combinations of possible calibrated values are tested during a series of test seeks of the predetermined fixed distance. During each test seek conducted in the calibration period, a cost function is calculated, and the combination of possible calibrated values with the best cost function is chosen for use as the optimum combination of calibrated values during the subsequent operational period. If, during the operational period, the cost function exceeds the cost function of the optimum combination of calibrated values by a predetermined amount, the controller is re-calibrated to maintain optimum performance of the disk drive during fixed-distance seeks.

    摘要翻译： 在用于控制磁盘驱动器的读/写头位置的伺服控制器中，校准控制器专用于固定距离寻道，特别是用于“单轨寻迹”（寻求直接相邻的轨道）。 首先在操作周期之前的校准周期内校准控制器。 校准周期的目的是确定固定距离寻找的“校准值”的最佳组合。 “校准值”可以包括：加速度脉冲幅度，加速度脉冲持续时间，减速脉冲幅度和减速脉冲持续时间。 在校准期间，在预定固定距离的一系列测试期间测试可能的校准值的各种组合。 在校准期间进行的每个测试寻求期间，计算成本函数，并选择可能的校准值与最佳成本函数的组合，以用作随后操作期间校准值的最佳组合。 如果在操作期间，成本函数超过校准值的最佳组合的成本函数预定量，则在固定距离寻找期间重新校准控制器以保持磁盘驱动器的最佳性能。