公开(公告)号：US08175201B2

公开(公告)日：2012-05-08

申请号：US12663325

申请日：2008-10-27

申请人： George Mathew ,  Yuan Xing Lee ,  Hongwei Song ,  Liu Jingfeng ,  Jongseung Park

发明人： George Mathew ,  Yuan Xing Lee ,  Hongwei Song ,  Liu Jingfeng ,  Jongseung Park

IPC分类号： H03D1/06 ,  H03D11/04 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10 ,  H04L1/00 ,  H04L25/08

CPC分类号： G11B19/041 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10046 ,  G11B20/10481 ,  G11B2220/2516

摘要： Various embodiments of the present invention provide systems and methods for performing adaptive equalization. For example, various embodiments of the present invention provide methods for adaptive equalization that include providing a data processing system with an equalizer circuit (210) and a target filter circuit (265). The equalizer circuit performs equalization based at least in part on an equalizer coefficient (215). The methods further include generating an error (285) based upon a first output from the equalizer circuit and a second output from the target filter circuit. An inter-symbol interference component (295) is extracted from the error (285) and used to calculate an equalizer gradient (226). Based at least in part on the equalizer gradient (226), the equalizer coefficient (215) is calculated.

摘要翻译： 本发明的各种实施例提供了用于执行自适应均衡的系统和方法。 例如，本发明的各种实施例提供了用于自适应均衡的方法，其包括向数据处理系统提供均衡器电路（210）和目标滤波器电路（265）。 均衡器电路至少部分地基于均衡器系数（215）来执行均衡。 所述方法还包括基于均衡器电路的第一输出和来自目标滤波器电路的第二输出产生误差（285）。 从误差（285）提取符号间干扰分量（295），并用于计算均衡器梯度（226）。 至少部分基于均衡器梯度（226），计算均衡器系数（215）。

公开(公告)号：US20100287420A1

公开(公告)日：2010-11-11

申请号：US12663325

申请日：2008-10-27

申请人： George Mathew ,  Yuan Xing Lee ,  Hongwei Song ,  Liu Jingfeng ,  Jongseung Park

发明人： George Mathew ,  Yuan Xing Lee ,  Hongwei Song ,  Liu Jingfeng ,  Jongseung Park

IPC分类号： G06F11/07

CPC分类号： G11B19/041 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10046 ,  G11B20/10481 ,  G11B2220/2516

摘要： Various embodiments of the present invention provide systems and methods for performing adaptive equalization. For example, various embodiments of the present invention provide methods for adaptive equalization that include providing a data processing system with an equalizer circuit (210) and a target filter circuit (265). The equalizer circuit performs equalization based at least in part on an equalizer coefficient (215). The methods further include generating an error (285) based upon a first output from the equalizer circuit and a second output from the target filter circuit. An inter-symbol interference component (295) is extracted from the error (285) and used to calculate an equalizer gradient (226). Based at least in part on the equalizer gradient (226), the equalizer coefficient (215) is calculated.

摘要翻译： 本发明的各种实施例提供了用于执行自适应均衡的系统和方法。 例如，本发明的各种实施例提供了用于自适应均衡的方法，其包括向数据处理系统提供均衡器电路（210）和目标滤波器电路（265）。 均衡器电路至少部分地基于均衡器系数（215）来执行均衡。 所述方法还包括基于均衡器电路的第一输出和来自目标滤波器电路的第二输出产生误差（285）。 从误差（285）提取符号间干扰分量（295），并用于计算均衡器梯度（226）。 至少部分地基于均衡器梯度（226），计算均衡器系数（215）。

公开(公告)号：US07872823B2

公开(公告)日：2011-01-18

申请号：US12352540

申请日：2009-01-12

申请人： Jingfeng Liu ,  Hongwei Song ,  Jongseung Park ,  George Mathew ,  Yuan Xing Lee

发明人： Jingfeng Liu ,  Hongwei Song ,  Jongseung Park ,  George Mathew ,  Yuan Xing Lee

IPC分类号： G11B5/09

CPC分类号： G11B5/09 ,  G11B20/10009 ,  G11B20/10027 ,  G11B20/10046 ,  H03G3/30 ,  H03M1/185

摘要： Various embodiments of the present invention provide systems and methods for gain control. For example, some embodiments of the present invention provide variable gain control circuits. Such circuits include a zero forcing loop generating a zero forcing feedback and a least mean square loop generating a least mean square feedback. An error quantization circuit generates a hybrid feedback based upon a threshold condition using the zero forcing feedback and the least mean square feedback. A variable gain amplifier is at least in part controlled by a derivative of the hybrid feedback.

摘要翻译： 本发明的各种实施例提供用于增益控制的系统和方法。 例如，本发明的一些实施例提供可变增益控制电路。 这种电路包括产生零强制反馈的零强制环路和产生最小均方反馈的最小均方环路。 误差量化电路使用零强制反馈和最小均方反馈基于阈值条件产生混合反馈。 可变增益放大器至少部分地由混合反馈的导数来控制。

公开(公告)号：US20100177419A1

公开(公告)日：2010-07-15

申请号：US12352540

申请日：2009-01-12

申请人： Jingfeng Liu ,  Hongwei Song ,  Jongseung Park ,  George Mathew ,  Yuan Xing Lee

发明人： Jingfeng Liu ,  Hongwei Song ,  Jongseung Park ,  George Mathew ,  Yuan Xing Lee

IPC分类号： G11B5/00 ,  H03G3/30

CPC分类号： G11B5/09 ,  G11B20/10009 ,  G11B20/10027 ,  G11B20/10046 ,  H03G3/30 ,  H03M1/185

摘要： Various embodiments of the present invention provide systems and methods for gain control. For example, some embodiments of the present invention provide variable gain control circuits. Such circuits include a zero forcing loop generating a zero forcing feedback and a least mean square loop generating a least mean square feedback. An error quantization circuit generates a hybrid feedback based upon a threshold condition using the zero forcing feedback and the least mean square feedback. A variable gain amplifier is at least in part controlled by a derivative of the hybrid feedback.

摘要翻译： 本发明的各种实施例提供用于增益控制的系统和方法。 例如，本发明的一些实施例提供可变增益控制电路。 这种电路包括产生零强制反馈的零强制环路和产生最小均方反馈的最小均方环路。 误差量化电路使用零强制反馈和最小均方反馈基于阈值条件产生混合反馈。 可变增益放大器至少部分地由混合反馈的导数来控制。

公开(公告)号：US08804260B2

公开(公告)日：2014-08-12

申请号：US13186174

申请日：2011-07-19

申请人： George Mathew ,  Jongseung Park ,  Shaohua Yang ,  Erich F. Haratsch ,  Ming Jin ,  Yuan Xing Lee

发明人： George Mathew ,  Jongseung Park ,  Shaohua Yang ,  Erich F. Haratsch ,  Ming Jin ,  Yuan Xing Lee

IPC分类号： G11B5/09

CPC分类号： G11B20/10046 ,  G11B5/012 ,  G11B5/09 ,  G11B19/045 ,  G11B20/10398 ,  G11B20/1217 ,  G11B2020/10759 ,  G11B2020/1232 ,  G11B2020/1298 ,  G11B2220/2516

摘要： Various embodiments of the present invention provide systems and methods for data processing. As an example, a data processing circuit is discussed that includes: a data buffer, an inter-track interference response circuit, and an inter-track interference signal estimator circuit. The data buffer is operable to store a previous track data set. The inter-track interference response circuit is operable to estimate an inter-track interference response from the previous track data set based at least in part on the previous track data set and a current track data set. The inter-track interference signal estimator circuit is operable to calculate an inter-track interference from the previous track data set based at least in part on the previous track data set and the inter-track interference response from the previous track data set.

摘要翻译： 本发明的各种实施例提供了用于数据处理的系统和方法。 作为示例，讨论了包括数据缓冲器，轨道间干扰响应电路和轨道间干扰信号估计器电路的数据处理电路。 数据缓冲器可操作以存储先前的轨迹数据集。 轨道间干扰响应电路可用于至少部分地基于先前的轨道数据集和当前轨道数据集来估计来自先前轨道数据集的轨道间干扰响应。 轨道间干扰信号估计器电路可用于至少部分地基于先前的轨道数据集和来自前一轨道数据集的轨道间干扰响应来计算来自先前轨道数据集的轨道间干扰。

公开(公告)号：US20120063022A1

公开(公告)日：2012-03-15

申请号：US13186174

申请日：2011-07-19

申请人： George Mathew ,  Jongseung Park ,  Shaohua Yang ,  Erich F. Haratsch ,  Ming Jin ,  Yuan Xing Lee

发明人： George Mathew ,  Jongseung Park ,  Shaohua Yang ,  Erich F. Haratsch ,  Ming Jin ,  Yuan Xing Lee

IPC分类号： G11B5/09

CPC分类号： G11B20/10046 ,  G11B5/012 ,  G11B5/09 ,  G11B19/045 ,  G11B20/10398 ,  G11B20/1217 ,  G11B2020/10759 ,  G11B2020/1232 ,  G11B2020/1298 ,  G11B2220/2516

摘要： Various embodiments of the present invention provide systems and methods for data processing. As an example, a data processing circuit is discussed that includes: a data buffer, an inter-track interference response circuit, and an inter-track interference signal estimator circuit. The data buffer is operable to store a previous track data set. The inter-track interference response circuit is operable to estimate an inter-track interference response from the previous track data set based at least in part on the previous track data set and a current track data set. The inter-track interference signal estimator circuit is operable to calculate an inter-track interference from the previous track data set based at least in part on the previous track data set and the inter-track interference response from the previous track data set.

摘要翻译： 本发明的各种实施例提供了用于数据处理的系统和方法。 作为示例，讨论了包括数据缓冲器，轨道间干扰响应电路和轨道间干扰信号估计器电路的数据处理电路。 数据缓冲器可操作以存储先前的轨迹数据集。 轨道间干扰响应电路可用于至少部分地基于先前的轨道数据集和当前轨道数据集来估计来自先前轨道数据集的轨道间干扰响应。 轨道间干扰信号估计器电路可用于至少部分地基于先前的轨道数据集和来自前一轨道数据集的轨道间干扰响应来计算来自先前轨道数据集的轨道间干扰。

公开(公告)号：US09305582B2

公开(公告)日：2016-04-05

申请号：US12663355

申请日：2008-10-27

申请人： George Mathew ,  Yuan Xing Lee ,  Hongwei Song ,  Jeffrey P. Grundvig ,  Viswanath Annampedu

发明人： George Mathew ,  Yuan Xing Lee ,  Hongwei Song ,  Jeffrey P. Grundvig ,  Viswanath Annampedu

IPC分类号： G11B21/02 ,  G11B27/36 ,  G11B5/60 ,  G11B5/596

CPC分类号： G11B5/6029 ,  G11B5/59688

摘要： Various embodiments of the present invention provide systems and methods for determining changes in fly-height. For example, various embodiments of the present invention provide storage devices that include a storage medium having servo data thereon. A read/write head assembly is disposed in relation to the storage medium. A servo based fly-height adjustment circuit receives the servo data via the read/write head assembly, and calculates a first harmonics ratio based on the received data and compares the first harmonics ratio with a second harmonics ratio to determine an error in the distance between the read/write head assembly and the storage medium.

摘要翻译： 本发明的各种实施例提供用于确定飞行高度变化的系统和方法。 例如，本发明的各种实施例提供了包括其上具有伺服数据的存储介质的存储设备。 相对于存储介质设置读/写头组件。 基于伺服的飞高调节电路经由读/写头组件接收伺服数据，并且基于接收到的数据计算第一谐波比，并将第一谐波比与二次谐波比进行比较，以确定第二谐波比之间的距离误差 读/写头组件和存储介质。

公开(公告)号：US08743936B2

公开(公告)日：2014-06-03

申请号：US12652201

申请日：2010-01-05

申请人： George Mathew ,  Shaohua Yang ,  Yuan Xing Lee ,  Hongwei Song

发明人： George Mathew ,  Shaohua Yang ,  Yuan Xing Lee ,  Hongwei Song

IPC分类号： H04B17/00 ,  H04Q1/20

CPC分类号： G11B20/10046 ,  H04B17/345

摘要： Various embodiments of the present invention provide systems and methods for estimating noise components in a received signal set. For example, one embodiment of the present invention provides a noise estimation circuit that includes a data detector circuit and a noise component calculation circuit. The data detector circuit receives a series of data samples and provides a detected output, and the noise component calculation circuit provides an electronics noise power output and a media noise power output each calculated based at least in part on the detected output and the series of data samples.

摘要翻译： 本发明的各种实施例提供了用于估计接收信号组中的噪声分量的系统和方法。 例如，本发明的一个实施例提供了一种包括数据检测器电路和噪声分量计算电路的噪声估计电路。 数据检测器电路接收一系列数据样本并提供检测的输出，并且噪声分量计算电路提供电子噪声功率输出和媒体噪声功率输出，每个至少部分地基于所检测的输出和数据系列计算 样品。

公开(公告)号：US20110249361A1

公开(公告)日：2011-10-13

申请号：US12758122

申请日：2010-04-12

申请人： George Mathew ,  Jeffrey Grundvig ,  Hongwei Song ,  Yuan Xing Lee

发明人： George Mathew ,  Jeffrey Grundvig ,  Hongwei Song ,  Yuan Xing Lee

IPC分类号： G11B21/02

CPC分类号： G11B5/6029 ,  G11B5/012 ,  G11B5/6064

摘要： In one embodiment, a hard-disk drive system performs fly-height control using a read-back mode and a loop-back mode. The read-back mode measures first and second harmonics pre-recorded on the medium and divides the first measurement by the second to obtain a read-back mode harmonic ratio. The loop-back mode measures the same first and second harmonics; however, the harmonics are provided by a write precompensation circuit rather than the medium. Further, the loop-back mode measurements are performed using asynchronous sampling to address aliasing and quantization errors. The first measurement is divided by the second to generate a loop-back harmonic ratio. In logarithm domain, the loop-back ratio is subtracted from the read-back mode ratio to remove environment-induced variations in the read path electronic circuits. The resulting harmonic ratio is subtracted from an initial harmonic ratio determined, for example, during manufacturing, to determine how much the harmonic ratio has changed.

摘要翻译： 在一个实施例中，硬盘驱动器系统使用回读模式和循环模式来执行飞行高度控制。 回读模式测量在介质上预先记录的第一和第二次谐波，并将第一次测量除以秒，以获得回读模式谐波比。 环回模式测量相同的第一和第二谐波; 然而，谐波由写入预补偿电路而不是介质提供。 此外，使用异步采样来执行环回模式测量以解决混叠和量化误差。 第一次测量除以二次以产生回路谐波比。 在对数域中，从回读模式比率中减去回路比，以消除读取路径电子电路中的环境引起的变化。 从制造时例如确定的初始谐波比减去得到的谐波比，以确定谐波比已经改变了多少。

公开(公告)号：US20100182718A1

公开(公告)日：2010-07-22

申请号：US12663345

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： G11B21/02

CPC分类号： G11B5/6029

摘要： Various embodiments of the present invention provide systems and methods for adaptive channel bit density estimation. For example, various embodiments of the present invention provide methods for adaptively estimating channel bit density. Such methods include providing a storage medium (178) that includes information corresponding to a process data set, and accessing the process data set from the storage medium (505). A first channel bit density estimate (535) is computed based at least in part on a first portion of the process data set (520-530), and a second channel bit density estimate (535) is calculated based at least in part on the first portion of the process data set, a second portion of the process data set (520-530) and the first channel bit density estimate (535).

摘要翻译： 本发明的各种实施例提供了用于自适应信道比特密度估计的系统和方法。 例如，本发明的各种实施例提供了自适应地估计信道比特密度的方法。 这样的方法包括提供包括与过程数据集相对应的信息的存储介质（178），以及从存储介质（505）访问过程数据集。 至少部分地基于过程数据集（520-530）的第一部分来计算第一信道比特密度估计（535），并且至少部分地基于所述第二信道比特密度估计 过程数据集的第一部分，过程数据集（520-530）的第二部分和第一信道比特密度估计（535）。