公开(公告)号：US07362536B1

公开(公告)日：2008-04-22

申请号：US11440623

申请日：2006-05-25

Applicant: Jingfeng Liu ,  Jinghuan Chen ,  Steve Aronson

Inventor： Jingfeng Liu ,  Jinghuan Chen ,  Steve Aronson

IPC: G11B5/596 ,  G11B21/02

CPC classification number: G11B5/5556 ,  G11B5/59616

Abstract: Methods of compensating for radial incoherence in servo information that is read from adjacent servo tracks that have a phase offset relative to one another on a data storage disk of a disk drive are provided. While a transducer is seeking to a target track, the transducer generate a servo information signal that has a first component from servo information read from a first servo track on the disk and a second component from servo information read from a second servo track that is radially adjacent to the first servo track. The servo information in the first and second servo tracks are offset by a non-zero phase error relative to one another and are in a same servo sector on the disk. The servo information signal is sampled to generate a series of sampled servo values. A phase error of a group of the sampled servo values is determined. The sampled servo values are compensated in response to the determined phase error to generate compensated servo values with at least reduced phase error.

Abstract translation: 提供了补偿在磁盘驱动器的数据存储盘上相对于彼此相位偏移的相邻伺服磁道读取的伺服信息中的径向相干性的方法。 当换能器正在寻找目标轨道时，换能器产生伺服信息信号，该伺服信息信号具有从盘上的第一伺服轨迹读取的伺服信息的第一分量，以及从径向地从第二伺服轨道读取的伺服信息的第二分量 邻近第一伺服轨道。 第一和第二伺服磁道中的伺服信息相对于彼此偏移非零相位误差，并且在磁盘上处于相同的伺服扇区中。 伺服信息信号被采样以产生一系列采样的伺服值。 确定一组采样伺服值的相位误差。 响应于所确定的相位误差来补偿采样的伺服值，以产生至少具有减小的相位误差的补偿的伺服值。

公开(公告)号：US08755136B1

公开(公告)日：2014-06-17

申请号：US13450290

申请日：2012-04-18

Applicant: Kian Wai Ng ,  Kameron K. Jung ,  Jinghuan Chen

Inventor： Kian Wai Ng ,  Kameron K. Jung ,  Jinghuan Chen

IPC: G11B27/36

CPC classification number: G11B5/455 ,  G11B20/10388

Abstract: In various embodiments, systems and methods to detect signal irregularity caused by defects in the read/write head element are disclosed. In some embodiments, an exemplary system comprises a memory and a processor. The processor is coupled to the memory and is configured to implement a filter module and a detector module. The filter module is configured to generate a test waveform based on data read from a medium by a storage device head to be tested. The detector module is configured to generate a signal quality value based on a property of at least a portion of the test waveform, compare the signal quality value to an event threshold, and generate an event indicator based on the comparison, the event indicator indicating possible instability of the storage device head.

Abstract translation: 在各种实施例中，公开了用于检测由读/写头元件中的缺陷引起的信号不均匀性的系统和方法。 在一些实施例中，示例性系统包括存储器和处理器。 处理器耦合到存储器并且被配置为实现滤波器模块和检测器模块。 过滤器模块被配置为基于要由待测试的存储设备头从介质读取的数据生成测试波形。 检测器模块被配置为基于测试波形的至少一部分的属性生成信号质量值，将信号质量值与事件阈值进行比较，并且基于比较生成事件指示符，事件指示符指示可能 存储设备头不稳定。

公开(公告)号：US07596196B1

公开(公告)日：2009-09-29

申请号：US11528144

申请日：2006-09-27

Applicant: Jingfeng Liu ,  Rose Shao ,  Jinghuan Chen

Inventor： Jingfeng Liu ,  Rose Shao ,  Jinghuan Chen

IPC: H04L7/00 ,  H04L27/06

CPC classification number: H04L7/0054 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10222 ,  G11B20/10296 ,  G11B20/10425 ,  G11B20/14 ,  G11B2020/185 ,  H04L7/0025 ,  H04L7/0062

Abstract: A decoding system includes a timing loop for use in error recovery mode operations, in which “fast decode” bit values that are used for timing recovery purposes in the normal modes of operation are replaced, at an appropriate iteration in the error recovery mode, with detected bit values from an iterative detector. The replacement occurs after a reread operation in which the timing loop maintains lock.

Abstract translation: 解码系统包括用于错误恢复模式操作的定时循环，其中在正常操作模式下用于定时恢复目的的“快速解码”比特值在错误恢复模式下以适当的迭代被替换， 检测到来自迭代检测器的位值。 替换发生在定时循环保持锁定的重读操作之后。

公开(公告)号：US07483227B1

公开(公告)日：2009-01-27

申请号：US11442752

申请日：2006-05-30

Applicant: Jinghuan Chen ,  Raymond Pavlak, Jr. ,  Jingfeng Liu

Inventor： Jinghuan Chen ,  Raymond Pavlak, Jr. ,  Jingfeng Liu

IPC: G11B5/02

CPC classification number: G11B5/40

Abstract: Methods are disclosed for detecting a thermal asperity condition of a head that is configured to generate a read signal by reading data on a rotatable data storage disk in a disk drive. The read signal includes a data component and a thermal component. The read signal is compared to a thermal asperity threshold to detect occurrence of an excessive level of the thermal component of the read signal as a thermal asperity condition of the head. The thermal asperity threshold is varied in response to a rate of occurrence of data value transitions in the data component of the read signal. The thermal asperity threshold can be increased in response to a decrease in the rate of occurrence of data value transitions, and can be decreased in response to an increase in the rate of occurrence of data value transitions. By varying the thermal asperity threshold, the sensitivity of the thermal asperity detector may be improved to allow lower level thermal asperity conditions to be detected with increased accuracy. Related disk drives are also disclosed.

Abstract translation: 公开了用于检测被配置为通过读取盘驱动器中的可旋转数据存储盘上的数据来生成读取信号的头部的热不平坦状态的方法。 读取信号包括数据分量和热分量。 将读取信号与热不均匀阈值进行比较，以检测读取信号的热分量的过高水平的发生是头部的热不平坦状态。 响应于读取信号的数据分量中的数据值转换的发生率，热不平坦阈值变化。 可以响应于数据值转换的发生率的降低而增加热不平坦阈值，并且可以响应于数据值转换的发生率的增加而减小热不平坦阈值。 通过改变热凹凸阈值，可以改善热凹凸检测器的灵敏度，以允许以更高的精度检测较低水平的热粗糙度条件。 还公开了相关的磁盘驱动器。

公开(公告)号：US4768482A

公开(公告)日：1988-09-06

申请号：US937295

申请日：1986-12-03

Applicant: Ansheng Cheng ,  Lifeng Lu ,  Jinghuan Chen ,  Bin Xu

Inventor： Ansheng Cheng ,  Lifeng Lu ,  Jinghuan Chen ,  Bin Xu

IPC: F02D11/04 ,  F02D11/10 ,  G05D13/10 ,  F22B37/22

CPC classification number: G05D13/10

Abstract: Automatic control and fuel saving means for internal combustion engines, comprising: at least one centrifugal speed sensor having at least one pair of flyweights, which flyweights are disposed in the guide tracks on a holder, the said guide tracks are such orientated that the components of the centrifugal forces of the flyweights in the guide track directions substantially match the elastic forces of the spring exerting on the flyweights; a mode shifting device connected to the said speed sensor and to the manual operating mechanisms, the said mode shifting device alternately puts the engine into the automatic control mode by the said speed sensor or into the manual control mode.

Abstract translation: 用于内燃机的自动控制和节油装置，包括：至少一个离心速度传感器，其具有至少一对飞重，所述至少一对飞重的飞轮设置在保持器上的引导轨道中，所述引导轨道的方向如下： 飞轮在导轨方向上的离心力基本上与弹簧上施加弹簧的弹力相匹配; 连接到所述速度传感器和手动操作机构的模式切换装置，所述模式切换装置通过所述速度传感器或手动控制模式交替地将发动机置于自动控制模式。