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21. 发明申请

US20130070362A1 ENERGY-BASED INTER-TRACK INTERFERENCE CANCELLATION 有权
标题翻译：基于能量的互联干扰消除
公开(公告)号：US20130070362A1
公开(公告)日：2013-03-21
申请号：US13591888
申请日：2012-08-22
申请人： George Mathew , Erich Franz Haratsch , Jongseung Park , Timothy B. Lund
发明人： George Mathew , Erich Franz Haratsch , Jongseung Park , Timothy B. Lund
IPC分类号： G11B20/24
CPC分类号： G11B20/24 , G11B5/012 , G11B19/045 , G11B20/10046 , G11B20/10398 , G11B20/1217 , G11B2020/10759 , G11B2020/1232 , G11B2020/1298 , G11B2220/2516
摘要： Described embodiments cancel inter-track interference (ITI) from one or more sectors read from a desired track of a storage medium. A read channel reads one or more sectors in the desired track and generates one or more groups of sample values corresponding to each of the sectors. An ITI canceller estimates an ITI response and an ITI signal for each sample value corresponding to (i) a next adjacent track and (ii) a previous adjacent track. If the estimated ITI response of the previous adjacent track reaches a predetermined threshold, the ITI canceller subtracts the estimated ITI signal corresponding to the previous adjacent track from each associated sample value of the desired track. If the estimated ITI response of the next adjacent track reaches a predetermined threshold, the ITI canceller subtracts the estimated ITI signal corresponding to the next adjacent track from each associated sample value of the desired track.
摘要翻译：所描述的实施例从从存储介质的期望轨道读取的一个或多个扇区中消除轨道间干扰（ITI）。读通道读取所需轨道中的一个或多个扇区，并生成与每个扇区对应的一组或多组样本值。 ITI消除器估计对应于（i）下一个相邻轨道和（ii）先前相邻轨道的每个采样值的ITI响应和ITI信号。如果先前相邻轨道的估计ITI响应达到预定阈值，则ITI消除器从期望轨道的每个相关联采样值中减去对应于先前相邻轨道的估计ITI信号。如果下一相邻轨道的估计ITI响应达到预定阈值，则ITI消除器从期望轨道的每个相关联采样值中减去对应于下一相邻轨道的估计ITI信号。

22. 发明申请

US20130021187A1 Systems and Methods for ADC Based Timing and Gain Control 有权
标题翻译：基于ADC的时序和增益控制的系统和方法
公开(公告)号：US20130021187A1
公开(公告)日：2013-01-24
申请号：US13186267
申请日：2011-07-19
申请人： Haitao Xia , George Mathew , Shaohua Yang
发明人： Haitao Xia , George Mathew , Shaohua Yang
IPC分类号： H03M1/12
CPC分类号： H03M1/1028 , H03M1/12
摘要： Various embodiments of the present invention provide circuits, systems and methods for data processing. For example, a data processing circuit is discussed that includes: an analog to digital converter circuit, a target response circuit, and a timing circuit. The analog to digital converter circuit is operable to receive a data input and to provide corresponding digital samples synchronous to a sampling phase. The sampling phase corresponds to a phase feedback. The target response circuit is operable to provide an expected output corresponding to a known input. The timing circuit is operable to generate the phase feedback based at least in part on values derived from the expected output.
摘要翻译：本发明的各种实施例提供用于数据处理的电路，系统和方法。例如，讨论了一种数据处理电路，其包括：模数转换器电路，目标响应电路和定时电路。模数转换器电路可操作以接收数据输入并提供与采样相位同步的相应数字采样。采样相位对应于相位反馈。目标响应电路可操作以提供对应于已知输入的预期输出。定时电路可操作以至少部分地基于从预期输出导出的值来产生相位反馈。

23. 发明授权

US08345373B2 Systems and methods for phase offset based spectral aliasing compensation 有权
标题翻译：基于相位偏移的光谱混叠补偿的系统和方法
公开(公告)号：US08345373B2
公开(公告)日：2013-01-01
申请号：US12856782
申请日：2010-08-16
申请人： George Mathew , Yuan Xing Lee , Hongwei Song
发明人： George Mathew , Yuan Xing Lee , Hongwei Song
IPC分类号： G11B5/09 , G11B5/00 , G11B21/02
CPC分类号： G11B5/6029
摘要： Various embodiments of the present invention provide systems and methods for phase offset based spectral aliasing compensation. For example, a circuit for spectral aliasing reduction is disclosed that includes a phase shift circuit operable to phase shift an analog input signal and to provide a phase shifted analog signal; a first analog to digital converter circuit operable to provide a first series of digital samples corresponding to the analog input signal at a sampling frequency; a second analog to digital converter circuit operable to provide a second series of digital samples corresponding to the phase shifted analog signal at the sampling frequency; and an averaging circuit operable to average the first series of digital samples with the second series of digital samples to yield an average output.
摘要翻译：本发明的各种实施例提供了基于相位偏移的光谱混叠补偿的系统和方法。例如，公开了一种用于频谱混叠减小的电路，其包括可移相模拟输入信号并提供相移模拟信号的相移电路; 第一模数转换器电路，其可操作来以采样频率提供对应于模拟输入信号的第一系列数字采样; 第二模数转换器电路，其可操作以提供对应于采样频率的相移模拟信号的第二系列数字采样; 以及平均电路，其可操作以用第二系列数字样本来平均第一系列数字样本以产生平均输出。

24. 发明申请

US20120095970A1 IDENTIFYING UNREFERENCED FILE SYSTEM COMPONENTS 有权
标题翻译：识别不正确的文件系统组件
公开(公告)号：US20120095970A1
公开(公告)日：2012-04-19
申请号：US12907632
申请日：2010-10-19
申请人： Nagaraj Shyam , Craig Keatley Harmer , George Mathew
发明人： Nagaraj Shyam , Craig Keatley Harmer , George Mathew
IPC分类号： G06F17/30
CPC分类号： G06F17/30094
摘要： A list of data structures (e.g., inodes) can be accessed, and the data structures in the list can be examined. If a data structure is examined, a counter value associated with the data structure is changed to a generation number that is associated with the examination. Subsequently, the counter values can be used to identify unreferenced data structures. More specifically, the counter value for an unreferenced data structure will be different from the generation number for the most recently performed examination.
摘要翻译：可以访问数据结构（例如，inode）的列表，并且可以检查列表中的数据结构。如果检查数据结构，则将与数据结构相关联的计数器值更改为与检查相关联的代数。随后，可以使用计数器值来识别未引用的数据结构。更具体地，未参考数据结构的计数器值将与最近执行的检查的代数不同。

25. 发明授权

US08139305B2 Systems and methods for timing and gain acquisition 有权
标题翻译：用于定时和增益获取的系统和方法
公开(公告)号：US08139305B2
公开(公告)日：2012-03-20
申请号：US12558928
申请日：2009-09-14
申请人： George Mathew , Hongwei Song , Yuan Xing Lee
发明人： George Mathew , Hongwei Song , Yuan Xing Lee
IPC分类号： G11B5/35
CPC分类号： G11B20/10009 , G11B20/10027 , G11B20/10222 , G11B20/10435 , G11B20/1049 , G11B2220/2516
摘要： Various embodiments of the present invention provide systems and methods for acquiring timing and/or gain information. For example, various embodiments of the present invention provide data processing circuits that include a sample splitting circuit, a first averaging circuit, a second averaging circuit and a parameter calculation circuit. The sample splitting circuit receives a data input that includes a series of samples that repeat periodically over at least a first phase and a second phase. The sample splitting circuit divides the series of samples into at least a first sub-stream corresponding to the first phase and a second sub-stream corresponding to the second phase. The first averaging circuit averages values from the first sub-stream to yield a first average, and the second averaging circuit averages values from the second sub-stream to yield a second average. The parameter calculation circuit calculates a parameter value based at least in part on the first average and the second average.
摘要翻译：本发明的各种实施例提供了用于获取定时和/或增益信息的系统和方法。例如，本发明的各种实施例提供了包括采样分离电路，第一平均电路，第二平均电路和参数计算电路的数据处理电路。采样分离电路接收包括在至少第一阶段和第二阶段周期性地重复的一系列样本的数据输入。样本分割电路将该系列样本划分成对应于第一相的至少第一子流和对应于第二相的第二子流。第一平均电路平均来自第一子流的值以产生第一平均值，并且第二平均电路平均来自第二子流的值以产生第二平均值。参数计算电路至少部分地基于第一平均值和第二平均值来计算参数值。

26. 发明申请

US20120056612A1 Systems and Methods for Phase Compensated Harmonic Sensing in Fly Height Control 有权
标题翻译：飞行高度控制中相位补偿谐波检测的系统与方法
公开(公告)号：US20120056612A1
公开(公告)日：2012-03-08
申请号：US12875734
申请日：2010-09-03
申请人： George Mathew , Pradeep Padukone , Hongwei Song , Suharli Tedja
发明人： George Mathew , Pradeep Padukone , Hongwei Song , Suharli Tedja
IPC分类号： G01R25/00
CPC分类号： G11B5/6029
摘要： Various embodiments of the present invention provide systems and methods for phase compensated harmonic sensing. For example, a circuit for harmonics calculation is disclosed that includes a phase difference estimation circuit and a phase offset compensation circuit. The harmonic calculation circuit is operable to calculate a first harmonic based on a periodic data pattern and a second harmonic based on the periodic data pattern. The phase difference estimation circuit operable to calculate a phase difference between the first harmonic and the second harmonic. The phase offset compensation circuit operable to align the second harmonic with the first harmonic to yield an aligned harmonic.
摘要翻译：本发明的各种实施例提供了用于相位补偿谐波感测的系统和方法。例如，公开了一种用于谐波计算的电路，其包括相位差估计电路和相位偏移补偿电路。谐波计算电路可操作以基于周期性数据模式和基于周期性数据模式的二次谐波计算第一谐波。所述相位差估计电路可操作以计算所述一次谐波和所述第二谐波之间的相位差。相位偏移补偿电路可操作以将二次谐波与第一谐波对准以产生对准的谐波。

27. 发明申请

US20120038998A1 Systems and Methods for Phase Offset Based Spectral Aliasing Compensation 有权
标题翻译：基于相位偏移的光谱混叠补偿的系统和方法
公开(公告)号：US20120038998A1
公开(公告)日：2012-02-16
申请号：US12856782
申请日：2010-08-16
申请人： George Mathew , Yuan Xing Lee , Hongwei Song
发明人： George Mathew , Yuan Xing Lee , Hongwei Song
IPC分类号： G11B21/02 , G06G7/28
CPC分类号： G11B5/6029
摘要： Various embodiments of the present invention provide systems and methods for phase offset based spectral aliasing compensation. For example, a circuit for spectral aliasing reduction is disclosed that includes a phase shift circuit operable to phase shift an analog input signal and to provide a phase shifted analog signal; a first analog to digital converter circuit operable to provide a first series of digital samples corresponding to the analog input signal at a sampling frequency; a second analog to digital converter circuit operable to provide a second series of digital samples corresponding to the phase shifted analog signal at the sampling frequency; and an averaging circuit operable to average the first series of digital samples with the second series of digital samples to yield an average output.
摘要翻译：本发明的各种实施例提供了基于相位偏移的光谱混叠补偿的系统和方法。例如，公开了一种用于频谱混叠减小的电路，其包括可移相模拟输入信号并提供相移模拟信号的相移电路; 第一模数转换器电路，其可操作来以采样频率提供对应于模拟输入信号的第一系列数字采样; 第二模数转换器电路，其可操作以提供对应于采样频率的相移模拟信号的第二系列数字采样; 以及平均电路，其可操作以用第二系列数字样本来平均第一系列数字样本以产生平均输出。

28. 发明授权

US08045283B2 Amplitude-based approach for detection and classification of hard-disc defect regions 失效
标题翻译：基于幅度的硬盘缺陷区域检测和分类方法
公开(公告)号：US08045283B2
公开(公告)日：2011-10-25
申请号：US12729312
申请日：2010-03-23
申请人： Shaohua Yang , George Mathew , Yang Han , Zongwang Li , Yuan Xing Lee
发明人： Shaohua Yang , George Mathew , Yang Han , Zongwang Li , Yuan Xing Lee
IPC分类号： G11B27/36 , G11B5/02
CPC分类号： G11B20/1816 , G11B20/1883 , G11B2005/0018 , G11B2020/1823 , G11B2220/20 , G11B2220/2516
摘要： In a hard-disc drive, a defect region on the hard disc is classified as corresponding to either thermal asperity (TA) or media defect (MD) by generating two statistical measures. A first measure (e.g., α1) is based on (i) the magnitudes of one or both of signal values (e.g., equalizer input or output signal values) and the corresponding expected values of those signal values and (ii) the signs of one or both of the signal values and the expected signal values. A second measure (e.g., α2) is based on the magnitudes of one or both of the signal values and the expected signal values, but not the signs of either the signal values or the expected signal values. The two measures are then compared to determine whether the defect region corresponds to TA or MD.
摘要翻译：在硬盘驱动器中，通过产生两个统计测量值将硬盘上的缺陷区域分类为对应于热粗糙度（TA）或介质缺陷（MD）。第一测量（例如，α1）基于（i）信号值（例如，均衡器输入或输出信号值）中的一个或两个的大小以及那些信号值的相应期望值，以及（ii）一个或信号值和预期信号值两者。第二量度（例如，α2）基于信号值和预期信号值中的一个或两个的幅度，而不是信号值或期望信号值的符号。然后比较两个测量值以确定缺陷区域是否对应于TA或MD。

29. 发明授权

US08014099B2 Systems and methods for using an on-the-fly CBD estimate to adjust fly-height 有权
标题翻译：使用实时CBD估算来调整飞行高度的系统和方法
公开(公告)号：US08014099B2
公开(公告)日：2011-09-06
申请号：US12254737
申请日：2008-10-20
申请人： George Mathew , Yuan Xing Lee , Hongwei Song , Jefferson E. Singleton
发明人： George Mathew , Yuan Xing Lee , Hongwei Song , Jefferson E. Singleton
IPC分类号： G11B5/60
CPC分类号： G11B5/6029
摘要： Various embodiments of the present invention provide systems and methods for using channel bit density estimates to adjust fly-height. For example, various embodiments of the present invention provide methods for adaptively adjusting fly-height. Such methods include providing a storage medium that includes information corresponding to a process data set, and a read/write head assembly that is disposed a variable distance from the storage medium. The process data set is accessed from the storage medium. A first channel bit density estimate is adaptively calculated based at least in part on the process data set and a second channel bit density estimate that was previously calculated. The variable distance is modified based at least in part on the first channel bit density estimate. A third channel bit density is adaptively calculated based at least in part on the process data set and a fourth channel bit density estimate that was previously calculated. The variable distance is modified based at least in part on the third channel bit density estimate.
摘要翻译：本发明的各种实施例提供了使用信道比特密度估计来调整飞行高度的系统和方法。例如，本发明的各种实施例提供了用于自适应地调整飞行高度的方法。这样的方法包括提供包括对应于过程数据集的信息的存储介质以及与存储介质可变距离设置的读/写头组件。从存储介质访问过程数据集。至少部分地基于过程数据集和先前计算的第二信道比特密度估计自适应地计算第一信道比特密度估计。至少部分地基于第一信道比特密度估计修改可变距离。至少部分地基于过程数据集和先前计算的第四通道位密度估计来自适应地计算第三通道位密度。至少部分地基于第三通道位密度估计修改可变距离。

30. 发明授权

US07924523B2 Frequency domain approach for efficient computation of fixed-point equalization targets 有权
标题翻译：用于有效计算定点均衡目标的频域方法
公开(公告)号：US07924523B2
公开(公告)日：2011-04-12
申请号：US12273265
申请日：2008-11-18
申请人： George Mathew , Yuan Xing Lee , Hongwei Song , Richard Rauschmayer
发明人： George Mathew , Yuan Xing Lee , Hongwei Song , Richard Rauschmayer
IPC分类号： G11B5/035
CPC分类号： G11B20/10212 , G11B20/10046 , G11B20/10194 , G11B20/24 , G11B2220/2516
摘要： Various embodiments of the present invention provide systems and methods for equalizing an input signal. For example, various embodiments of the present invention provide a method for performing equalization in a storage device. Such methods include providing an equalizer circuit that is governed by a target value, and a filter circuit that is governed by a filter coefficient. An initial value is provided to the equalizer circuit as the target value, and an overall target based at least in part on the initial value and the filter coefficient is calculated. An updated value is calculated based on the overall target, and the updated value is provided to the equalizer circuit as the target value.
摘要翻译：本发明的各种实施例提供了用于均衡输入信号的系统和方法。例如，本发明的各种实施例提供了一种用于在存储设备中执行均衡的方法。这样的方法包括提供由目标值控制的均衡器电路和由滤波器系数控制的滤波器电路。将初始值作为目标值提供给均衡器电路，并且至少部分地基于初始值和滤波器系数来计算总体目标。基于总体目标计算更新的值，并且将更新的值作为目标值提供给均衡器电路。

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