公开(公告)号：US06215266B1

公开(公告)日：2001-04-10

申请号：US09100761

申请日：1998-06-17

Applicant: Nan Ling Goh ,  James Lai Kein Chang ,  Yam Pheng Tham ,  Utt Heng Kan ,  Kah Liang Gan

Inventor： Nan Ling Goh ,  James Lai Kein Chang ,  Yam Pheng Tham ,  Utt Heng Kan ,  Kah Liang Gan

IPC: H02P620

CPC classification number: H02M1/34 ,  H02M2001/348 ,  H02P6/14 ,  H02P6/20

Abstract: A system for low acoustic noise spindle motor commutation is disclosed. The system contains a control device that generates commutation control signals which cause spindle motor drivers to source or sink current through windings of a spindle motor. The windings create electromagnetic fields which induce rotational movement in a spindle motor rotor. Low acoustic noise snubber devices are coupled to each winding and are dynamically configurable by the control device to provide low spindle motor driver charging current upon initial application of power to the spindle motor, and reduced acoustic noise and back EMF-generated current and voltage surges at the spindle motor driver during spindle motor commutation.

Abstract translation: 公开了一种用于低声噪声主轴电动机换向的系统。 该系统包含一个产生换向控制信号的控制装置，使得主轴电动机驱动器通过主轴电动机的绕组来产生或吸收电流。 绕组产生在主轴电机转子中引起旋转运动的电磁场。 低噪声缓冲装置耦合到每个绕组，并且可由控制装置动态地配置，以在初始向主轴电机施加电力时提供低主轴电动机驱动器充电电流，并且减少了噪声和反电动势产生的电流和电压浪涌 主轴电机换向时的主轴电机驱动器。

公开(公告)号：US06862152B2

公开(公告)日：2005-03-01

申请号：US10374419

申请日：2003-02-25

Applicant: DetHau Wu ,  Edmun ChianSong Seng ,  Utt Heng Kan

Inventor： DetHau Wu ,  Edmun ChianSong Seng ,  Utt Heng Kan

IPC: G11B5/012 ,  G11B20/10 ,  G11B5/035 ,  G11B5/02

CPC classification number: G11B20/10046 ,  G11B5/012 ,  G11B20/10009

Abstract: A channel adjustment control adjusts a channel to reduce bit error rate in a disc drive. Variable gain register settings are read and compared to filter characteristics to provide an operational boost register setting for an adjustable gain amplifier in the channel. An operational pole register setting is provided based on the operational boost register setting and known parameters of the adjustable low pass filter. Low and high frequency data patterns are applied while the channel adjustment control reads the variable gain register settings.

Abstract translation: 频道调整控制调整频道以减少磁盘驱动器中的位错误率。 读取可变增益寄存器设置并将其与滤波器特性进行比较，以为通道中的可调增益放大器提供可操作的升压寄存器设置。 基于可调低通滤波器的操作升压寄存器设置和已知参数，提供操作极寄存器设置。 当频道调整控制读取可变增益寄存器设置时，应用低频和高频数据模式。

公开(公告)号：US06754030B2

公开(公告)日：2004-06-22

申请号：US10029318

申请日：2001-12-21

Applicant: Edmun Chian Song Seng ,  Xiong Liu ,  Aik Chuan Lim ,  Kay Hee Tang ,  Utt Heng Kan ,  Choon Kiat Lim

Inventor： Edmun Chian Song Seng ,  Xiong Liu ,  Aik Chuan Lim ,  Kay Hee Tang ,  Utt Heng Kan ,  Choon Kiat Lim

IPC: G11B500

CPC classification number: G11B20/20 ,  G11B5/59627 ,  G11B27/36 ,  G11B2220/20

Abstract: A method of and apparatus for generating a reader-to-writer offset for a head positioned over a track on a disc in a disc drive having a plurality of tracks is disclosed. A reader and a writer are mounted on the head in a non-overlapping manner with a gap between the reader and the writer, which is known as the reader-to-writer offset. A disc drive controller is operably connected to the reader and the writer. The disc drive controller determines the reader-to-writer offset of the head for each track by computing the difference between a first head position x1 and a second head position x2. The first head position x1 is an optimal head position for writing information on the track and the second head position x2 is a midpoint of an off-track capability (OTC) of the head. The OTC is a portion of a track pitch over which the reader is expected to read information that is free of an incorrigible bit error such that the writer-to-reader track misregistration (TMR) is minimized as the head is radially displaced the reader-to-writer offset to read information written on the track or to write information on the track.

Abstract translation: 公开了一种用于为位于具有多个磁道的磁盘驱动器中的磁盘上的轨道上的磁头产生读取器到写入器偏移的方法和装置。 阅读器和写入器以不重叠的方式安装在头上，读取器和写入器之间的间隙被称为读写器偏移。 磁盘驱动器控制器可操作地连接到读取器和写入器。 磁盘驱动器控制器通过计算第一磁头位置x1和第二磁头位置x2之间的差来确定每个轨道的磁头的读写器偏移。 第一头位置x1是用于在轨道上写入信息的最佳头部位置，而第二头部位置x2是头部的偏离轨迹能力（OTC）的中点。 OTC是轨道间距的一部分，阅读器期望阅读器读取没有不可避免的位错误的信息，使得写入器到读取器轨迹重合失调（TMR）最小化，因为磁头使读取器 - 写入器偏移以读取写在轨道上的信息或在轨道上写入信息。

公开(公告)号：US06519106B1

公开(公告)日：2003-02-11

申请号：US09553073

申请日：2000-04-20

Applicant: Nan Ling Goh ,  Ban Hok Goh ,  Utt Heng Kan ,  Kah Liang Gan

Inventor： Nan Ling Goh ,  Ban Hok Goh ,  Utt Heng Kan ,  Kah Liang Gan

IPC: G11B535

CPC classification number: G11B20/10055 ,  G11B5/02 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10203 ,  G11B20/10296 ,  G11B2005/0016 ,  G11B2005/0018

Abstract: A method for compensating digital samples of an asymmetric read signal is presented. The method involves reading a digital sample of an asymmetric read signal V(t) (160), generating a compensated sample at least when the digital sample requires compensation (164), and outputting either the digital sample (168) or the compensated sample (166). Also presented is an asymmetry correction block (158) of a read channel (144) of a disc drive (110) that includes an input (200), a level detector (202), a compensator (204), and an output (208). The level detector (202) and the compensator (204) receive the digital sample through the input (200). The level detector (202) determines whether the digital sample requires compensation. The compensator (204) generates a compensated sample at least when the digital sample requires compensation. The output (208) selectively outputs either the digital sample or the compensated sample.

Abstract translation: 提出了一种用于补偿非对称读信号的数字样本的方法。 该方法涉及读取非对称读取信号V（t）（160）的数字样本，至少当数字样本需要补偿时产生补偿样本（164），并输出数字样本（168）或补偿样本 166）。 还提出了包括输入（200），电平检测器（202），补偿器（204）和输出（208）的盘驱动器（110）的读通道（144）的不对称校正块（158） ）。 电平检测器（202）和补偿器（204）通过输入（200）接收数字采样。 电平检测器（202）确定数字样本是否需要补偿。 至少当数字样本需要补偿时，补偿器（204）产生补偿样本。 输出（208）选择性地输出数字样本或补偿样本。