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1. 发明授权

US07330328B2 Random number generation using back electromotive force (BEMF) values 有权
标题翻译：使用反电动势（BEMF）值的随机数生成
公开(公告)号：US07330328B2
公开(公告)日：2008-02-12
申请号：US11356499
申请日：2006-02-17
申请人： WenXiang Xie , LeeLing Tan , Xiong Liu , WeiLoon Ng
发明人： WenXiang Xie , LeeLing Tan , Xiong Liu , WeiLoon Ng
IPC分类号： G11B21/02
CPC分类号： G06F7/588
摘要： Method and apparatus for generating a random number, such as for use in a security protocol to control access to a data processing system. A processor generates the random number in relation to a back electromotive force (BEMF) value. The BEMF value is preferably obtained in response to application of current to a circuit. The circuit preferably comprises a coil and the application of current preferably induces a relatively small movement of the coil. The random number is preferably a multi-bit digital value, and each bit of the random number is determined in relation to whether the corresponding BEMF value is even or odd. The coil preferably comprises a coil of a voice coil motor (VCM) used to position a transducer adjacent a rotatable storage medium, and the random number is preferably generated while the medium is in a non-rotatable state.
摘要翻译：用于生成随机数的方法和装置，例如用于安全协议中以控制对数据处理系统的访问。处理器产生与反电动势（BEMF）值相关的随机数。优选地，响应于电流施加到电路而获得BEMF值。电路优选地包括线圈，并且电流的施加优选地引起线圈的相对小的运动。随机数优选为多位数字值，并且相关于相应的BEMF值是偶数还是奇数来确定随机数的每个位。线圈优选地包括用于将换能器邻近可旋转存储介质定位的音圈电机（VCM）的线圈，并且优选地在介质处于不可旋转状态时产生随机数。

2. 发明申请

US20070195448A1 Random number generation using back electromotive force (BEMF) values 有权
标题翻译：使用反电动势（BEMF）值的随机数生成
公开(公告)号：US20070195448A1
公开(公告)日：2007-08-23
申请号：US11356499
申请日：2006-02-17
申请人： WenXiang Xie , LeeLing Tan , Xiong Liu , WeiLoon Ng
发明人： WenXiang Xie , LeeLing Tan , Xiong Liu , WeiLoon Ng
IPC分类号： G11B21/02
CPC分类号： G06F7/588
摘要： Method and apparatus for generating a random number, such as for use in a security protocol to control access to a data processing system. A processor generates the random number in relation to a back electromotive force (BEMF) value. The BEMF value is preferably obtained in response to application of current to a circuit. The circuit preferably comprises a coil and the application of current preferably induces a relatively small movement of the coil. The random number is preferably a multi-bit digital value, and each bit of the random number is determined in relation to whether the corresponding BEMF value is even or odd. The coil preferably comprises a coil of a voice coil motor (VCM) used to position a transducer adjacent a rotatable storage medium, and the random number is preferably generated while the medium is in a non-rotatable state.
摘要翻译：用于生成随机数的方法和装置，例如用于安全协议中以控制对数据处理系统的访问。处理器产生与反电动势（BEMF）值相关的随机数。优选地，响应于电流施加到电路而获得BEMF值。电路优选地包括线圈，并且电流的施加优选地引起线圈的相对小的运动。随机数优选为多位数字值，并且相关于相应的BEMF值是偶数还是奇数来确定随机数的每个位。线圈优选地包括用于将换能器邻近可旋转存储介质定位的音圈电机（VCM）的线圈，并且优选地在介质处于不可旋转状态时产生随机数。

3. 发明授权

US06937427B2 Method and apparatus for measuring the back EMF of a disc drive VCM 有权
标题翻译：用于测量磁盘驱动器VCM的反电动势的方法和装置
公开(公告)号：US06937427B2
公开(公告)日：2005-08-30
申请号：US10465713
申请日：2003-06-19
申请人： LeeLing Tan , Xiong Liu , ChoonKit Lim , MuiChong Chai
发明人： LeeLing Tan , Xiong Liu , ChoonKit Lim , MuiChong Chai
IPC分类号： G11B5/55 , G11B5/596 , G11B21/02
CPC分类号： G11B5/5521
摘要： An apparatus and method of measuring a back electromotive force (BEMF) voltage of a disc drive voice coil motor (VCM) is provided in which a temperature of the VCM is obtained. The BEMF voltage of the VCM is computed as a function of the temperature of the VCM.
摘要翻译：提供一种测量盘驱动音圈马达（VCM）的反电动势（BEMF）电压的装置和方法，其中获得VCM的温度。 VCM的BEMF电压作为VCM的温度的函数计算。

4. 发明授权

US07349174B2 Soft sensor for operating shock in a disc drive 失效
标题翻译：用于在磁盘驱动器中操作冲击的软传感器
公开(公告)号：US07349174B2
公开(公告)日：2008-03-25
申请号：US10143137
申请日：2002-05-09
申请人： Qiang Bi , Xiong Liu , LeeLing Tan , Wen-Jun Cao , ChoonKiat Lim
发明人： Qiang Bi , Xiong Liu , LeeLing Tan , Wen-Jun Cao , ChoonKiat Lim
IPC分类号： G11B5/596
CPC分类号： G11B27/36 , G11B19/04 , G11B2220/20
摘要： A method of preventing a write operation to a disc in a disc drive during a shock event without the use of a separate shock sensor comprises steps of monitoring an actuator voice coil motor (VCM) control plant output signal, generating an actuator voice coil motor (VCM) plant model module output signal, comparing the VCM plant model module output signal to the VCM control plant module output signal to produce a difference signal, and triggering a write protect gate if the difference signal exceeds a predetermined threshold value. The system comprises a voice coil motor (VCM) control plant module sensitive to a shock event providing a VCM control plant module output, a voice coil motor (VCM) plant model module initially insensitive to the shock event producing a VCM plant model module output, a first comparator module coupled to receive the VCM control plant module output and the VCM plant model module output, operable to generate a difference signal between the model plant module output and the VCM control plant module output, and a triggering module receiving the difference signal for generating a write protect gate signal if the difference signal exceeds a predetermined shock threshold.
摘要翻译：一种在不使用单独的冲击传感器的情况下防止在磁盘驱动器中对盘的写入操作的方法包括以下步骤：监视致动器音圈电机（VCM）控制电路输出信号，产生致动器音圈电机 VCM）工厂模块模块输出信号，将VCM工厂模块模块输出信号与VCM控制站模块输出信号进行比较，产生差分信号，如果差分信号超过预定阈值则触发写保护门。该系统包括对提供VCM控制工厂模块输出的冲击事件敏感的音圈电机（VCM）控制工厂模块，对产生VCM工厂模块模块输出的冲击事件最初不敏感的音圈电机（VCM）工厂模型模块，第一比较器模块，其耦合以接收VCM控制工厂模块输出和VCM工厂模块模块输出，可操作以在模型工厂模块输出和VCM控制工厂模块输出之间产生差分信号;以及触发模块，其接收差分信号如果差分信号超过预定的冲击阈值，则产生写保护门信号。

5. 发明申请

US20050034539A1 Motor torque variation compensation 审中-公开
标题翻译：电机转矩变动补偿
公开(公告)号：US20050034539A1
公开(公告)日：2005-02-17
申请号：US10814016
申请日：2004-03-31
申请人： LeeLing Tan , MingZhong Ding , KianKeong Ooi , JianYi Wang
发明人： LeeLing Tan , MingZhong Ding , KianKeong Ooi , JianYi Wang
IPC分类号： G11B5/55 , G11B21/08 , H02P25/02 , H02P5/34
CPC分类号： G11B5/5526 , G11B21/083 , H02P25/034
摘要： Method and apparatus for compensating variations in motor torque in a control system that employs a motor to accelerate a control object, such as a data transducing head in a data storage device. During acceleration of the control object, a plurality of distances successively traveled by the control object are measured, and the measured distances are combined to compensate for said variations in motor torque. Preferably, a constant control input is applied to accelerate the control object at a constant rate of acceleration less than a maximum rate of acceleration that can be obtained by the motor. A coarse adjustment routine is preferably applied to arrive at a first compensation value that compensates for said variations at a first resolution, after which a fine adjustment routine is performed using the first compensation value to arrive at the final compensation value at a second resolution greater than the first resolution.
摘要翻译：用于补偿使用电动机来加速诸如数据存储装置中的数据转换头的控制对象的控制系统中的电动机转矩变化的方法和装置。在控制对象的加速期间，测量由控制对象相继行进的多个距离，并且组合所测量的距离以补偿所述电动机转矩的变化。优选地，施加恒定的控制输入以以小于由电动机可以获得的最大加速速率的恒定加速度加速控制对象。优选地应用粗调程序以获得以第一分辨率补偿所述变化的第一补偿值，之后使用第一补偿值执行微调程序，以大于第二分辨率的第二分辨率得到最终补偿值第一个决议。

6. 发明授权

US06687065B2 Resonance screen with varying frequency and controllable gain booster 失效
标题翻译：具有变化频率和可控增益增强器的共振屏
公开(公告)号：US06687065B2
公开(公告)日：2004-02-03
申请号：US09778472
申请日：2001-02-07
申请人： LeeLing Tan , MingZhong Ding , WeeMeng Yio , KianKeong Ooi , KokHoe Chia
发明人： LeeLing Tan , MingZhong Ding , WeeMeng Yio , KianKeong Ooi , KokHoe Chia
IPC分类号： G11B2736
CPC分类号： G11B27/36 , G11B21/106 , G11B2220/20
摘要： A disc drive includes a base and a disc rotatably attached to the base. The disc drive also includes an actuator assembly rotatably attached to said base and a device for moving the actuator assembly. The actuator assembly includes an actuator arm and a transducer head in a transducing relationship with respect to the disc. The transducer is attached to the actuator arm. A method for screening disc drives for resonant frequencies associated with the actuator arm includes the steps of following a track within the disc drive, and selectively boosting the servo control signal. The method further includes a step of monitoring a position error signal from a transducer attached to an actuator arm of a disc drive. The position error signal is monitored by filtering the position error signal using a bandpass filter. Boosting the servo control loop includes tuning the magnitude of the booster signal gain.
摘要翻译：盘驱动器包括基座和可旋转地附接到基座的盘。盘驱动器还包括可旋转地附接到所述基座的致动器组件和用于移动致动器组件的装置。致动器组件包括致动器臂和相对于盘的换能关系的换能器头。传感器连接到执行器臂。用于筛选与致动器臂相关联的谐振频率的盘驱动器的方法包括跟随盘驱动器内的轨道并且选择性地升高伺服控制信号的步骤。该方法还包括监测来自附接到盘驱动器的致动器臂的换能器的位置误差信号的步骤。通过使用带通滤波器对位置误差信号进行滤波来监视位置误差信号。升压伺服控制回路包括调整升压信号增益的幅度。

7. 发明授权

US06690534B2 Method and apparatus for handling multiple resonance frequencies in disc drives using active damping 有权
标题翻译：用于使用主动阻尼处理磁盘驱动器中的多个共振频率的方法和装置
公开(公告)号：US06690534B2
公开(公告)日：2004-02-10
申请号：US09827339
申请日：2001-04-05
申请人： MingZhong Ding , YangQuan Chen , LeeLing Tan , Wing Kong Chiang , KianKeong Ooi , BengWee Quak
发明人： MingZhong Ding , YangQuan Chen , LeeLing Tan , Wing Kong Chiang , KianKeong Ooi , BengWee Quak
IPC分类号： G11B5596
CPC分类号： G11B5/5582
摘要： A method of handling multiple resonance frequencies in a disc drive includes monitoring a position error signal (PES) for an actuator arm, generating a plurality of feedforward compensation signals from the PES using a plurality of bandpass filters, and applying the compensation signals to a servo control signal. Each filter has a center frequency that is set to a problematic resonance frequency. The method may also include identifying the problematic frequencies by, for example, commanding a movement of the actuator arm, collecting data points for the PES that are associated with the movement, and performing a digital fourier transform of the data points to identify resonant frequencies. Other methods of identifying problematic frequencies include analyzing PES zero-crossing data, or using principal component analysis.
摘要翻译：一种在盘驱动器中处理多个共振频率的方法包括监视致动器臂的位置误差信号（PES），使用多个带通滤波器从PES产生多个前馈补偿信号，并将补偿信号施加到伺服控制信号。每个滤波器的中心频率被设置为有问题的共振频率。该方法还可以包括通过例如指令致动器臂的移动来收集有问题的频率，收集与移动相关联的PES的数据点，以及执行数据点的数字傅里叶变换以识别共振频率。识别有问题频率的其他方法包括分析PES过零数据，或使用主成分分析。

8. 发明授权

US06574067B2 Optimally designed parsimonious repetitive learning compensator for hard disc drives having high track density 失效
标题翻译：具有高轨道密度的硬盘驱动器的优化设计的简约重复学习补偿器
公开(公告)号：US06574067B2
公开(公告)日：2003-06-03
申请号：US09759754
申请日：2001-01-12
申请人： YangQuan Chen , MingZhong Ding , LinCheng Xiu , KianKeong Ooi , LeeLing Tan
发明人： YangQuan Chen , MingZhong Ding , LinCheng Xiu , KianKeong Ooi , LeeLing Tan
IPC分类号： G11B5596
CPC分类号： G11B5/59605 , G11B5/5521
摘要： A repetitive learning compensator for a servo system of a disc drive includes a memory buffer having a length N/m where N is the number of servo sectors in a track, m is a parsing factor greater than 1 and N/m is an integer. A down sampler supplies servo signals containing error signals to the repetitive learning compensator at a frequency of fs/m, where fs is a sampling frequency based on N and a fundamental frequency f0 of the spindle motor. An up sampler supplies filtered signals from the repetitive learning compensator to the actuator assembly at the sampling frequency fs. One aspect of the disclosure includes tuning the repetitive learning compensator with a phase advance represented by NPA and a cutoff frequency fc, where NPA and fc are selected as a pair to provide the greatest transfer function amplitude at the harmonic frequencies for the repetitive learning compensator.
摘要翻译：用于盘驱动器的伺服系统的重复学习补偿器包括具有长度N / m的存储器缓冲器，其中N是轨道中的伺服扇区的数量，m是大于1的解析因子，N / m是整数。下采样器以fs / m的频率向重复学习补偿器提供含有误差信号的伺服信号，其中fs是基于N的采样频率和主轴电机的基频f0。上采样器以重复学习补偿器将滤波信号以采样频率fs提供给执行器组件。本公开的一个方面包括用由NPA表示的相位提前和截止频率fc来调整重复学习补偿器，其中NPA和fc被选择为一对以在重复学习补偿器的谐波频率处提供最大的传递函数幅度。

9. 发明授权

US06437936B1 Repeatable runout compensation using a learning algorithm with scheduled parameters 有权
标题翻译：使用具有调度参数的学习算法可重复的跳动补偿
公开(公告)号：US06437936B1
公开(公告)日：2002-08-20
申请号：US09489532
申请日：2000-01-21
申请人： YangQuan Chen , LeeLing Tan , KianKeong Ooi , Qiang Bi , KokHiang Cheong
发明人： YangQuan Chen , LeeLing Tan , KianKeong Ooi , Qiang Bi , KokHiang Cheong
IPC分类号： G11B5596
CPC分类号： G11B5/59627
摘要： A method and apparatus for compensating for written-in repeatable runout in a disc drive is provided. Compensation values are determined through an iterative learning process in which parameters of the learning process such as learning gain, servo loop gain, etc. are functions of the iteration number. The learning process also employs a nominal double integrator model of an actuator of the disc storage system. The learning process is also a function of a zero-phase low-pass filter.
摘要翻译：提供了用于补偿盘驱动器中的可写入可重复跳动的方法和装置。通过迭代学习过程来确定补偿值，其中诸如学习增益，伺服循环增益等学习过程的参数是迭代次数的函数。学习过程还采用盘存储系统的执行器的标称双积分器模型。学习过程也是零相位低通滤波器的一个功能。

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