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11. 发明申请

US20120036173A1 Systems and Methods for Sequence Detection in Data Processing 有权
标题翻译：数据处理中序列检测的系统和方法
公开(公告)号：US20120036173A1
公开(公告)日：2012-02-09
申请号：US12851475
申请日：2010-08-05
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： G06F17/15
CPC分类号： G11B20/10009 , G11B20/10055 , G11B20/10277 , G11B20/10296 , H03M13/4161 , H04L25/03184
摘要： Various embodiments of the present invention provide systems and methods for sequence detection. As an example, a method for data detection is disclosed that includes: receiving a series of data samples at a detector circuit; multiplying a portion of the series of data samples by a first correlator value corresponding to a first binary transition to yield a first value; multiplying the portion of the series of data samples by a second correlator value corresponding to a second binary transition to yield a second value; adding the first value to a prior state value to yield a first interim value; adding the second value to the prior state value to yield a second interim value; and selecting the larger of the first interim value and the second interim value to yield a surviving interim value.
摘要翻译：本发明的各种实施例提供了用于序列检测的系统和方法。作为示例，公开了一种用于数据检测的方法，包括：在检测器电路处接收一系列数据样本; 将所述一系列数据样本的一部分乘以对应于第一二进制转换的第一相关器值以产生第一值; 将所述一系列数据样本的所述部分乘以对应于第二二进制转换的第二相关器值以产生第二值; 将所述第一值添加到先前状态值以产生第一中间值; 将所述第二值添加到所述先前状态值以产生第二临时值; 并且选择第一临时值和第二临时值中较大的一个以产生存活的临时值。

12. 发明申请

US20110043938A1 Systems and Methods for Fly-Height Control Using Servo Data 有权
标题翻译：使用伺服数据进行飞行高度控制的系统和方法
公开(公告)号：US20110043938A1
公开(公告)日：2011-02-24
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： G11B27/36 , G11B21/02
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。

13. 发明授权

US07583458B2 Channel optimization metrics 有权
标题翻译：渠道优化指标
公开(公告)号：US07583458B2
公开(公告)日：2009-09-01
申请号：US10900546
申请日：2004-07-28
申请人： Viswanath Annampedu , Pervez M. Aziz
发明人： Viswanath Annampedu , Pervez M. Aziz
IPC分类号： G11B5/09 , G11B20/10
CPC分类号： G11B20/10212 , G11B20/10037 , G11B20/10046 , G11B20/10296 , G11B20/10481
摘要： A recording system, such as a magnetic or optical recording system, employs optimization metrics that are independent of a target partial response for equalization of a signal read from a recording channel. The optimization metrics employ samples adjacent to codeword boundaries of codewords representing encoded data, such as servo data, read from a recording medium. The optimization metrics are used to select filter parameters and/or tap weights for equalization. The filter parameters and/or tap weights might be derived based on the type of data read from the recording medium, the type of detector employed to detect the codewords of the read data, and the type of encoder/decoder employed for the read data.
摘要翻译：诸如磁或光记录系统的记录系统采用独立于用于对从记录通道读取的信号进行均衡的目标部分响应的优化度量。优化度量采用与表示从记录介质读取的编码数据（例如伺服数据）的码字的码字边界相邻的样本。优化度量用于选择滤波器参数和/或抽头权重以进行均衡。滤波器参数和/或抽头权重可以基于从记录介质读取的数据的类型，用于检测读取数据的代码字的检测器的类型以及用于读取数据的编码器/解码器的类型来导出。

14. 发明授权

US07499238B2 Systems and methods for improving disk drive synchronization 有权
标题翻译：改进磁盘驱动器同步的系统和方法
公开(公告)号：US07499238B2
公开(公告)日：2009-03-03
申请号：US11534265
申请日：2006-09-22
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： G11B21/02 , G11B5/596 , G11B5/09
CPC分类号： G11B5/596 , G11B20/10009 , G11B20/18 , G11B2020/1281 , G11B2220/2516
摘要： Various systems and methods for providing head location feedback are disclosed herein. For example, one system includes an interface circuit that is operable to receive an information stream retrieved from a magnetic storage medium. The magnetic storage medium includes one or more tracks that each include a plurality of sectors. The sectors include burst information that can be utilized to aid in positioning a read/write head assembly over a magnetic storage medium. The systems further include a multiple sector error detection circuit. The multiple sector error correction circuit is operable to phase align samples of a burst obtained from one sector with samples of a burst obtained from another sector. An amplitude of each of the bursts is determined, and the determined amplitudes are combined. The combined amplitudes correspond to a position error of the read/write head assembly relative to the magnetic storage medium. In some cases, the devices further include a motor controller that is operable to receive the combination of the amplitudes and to cause the head assembly to move relative to the magnetic storage medium by an amount corresponding to the position error.
摘要翻译：本文公开了用于提供头位置反馈的各种系统和方法。例如，一个系统包括可操作以接收从磁存储介质检索的信息流的接口电路。磁存储介质包括一个或多个轨道，每个轨道包括多个扇区。扇区包括可用于帮助将读/写头组件定位在磁存储介质上的突发信息。该系统还包括多扇区误差检测电路。多扇区误差校正电路可用于将从一个扇区获得的脉冲串的样本与从另一扇区获得的突发样本进行相位调整。确定每个突发的幅度，并且确定的幅度被组合。组合幅度对应于读/写头组件相对于磁存储介质的位置误差。在一些情况下，装置还包括电动机控制器，其可操作以接收振幅的组合，并使头部组件相对于磁存储介质移动与位置误差相对应的量。

15. 发明授权

US07082005B2 Servo data detection in the presence or absence of radial incoherence using digital interpolators 有权
公开(公告)号：US07082005B2
公开(公告)日：2006-07-25
申请号：US10228548
申请日：2002-08-27
申请人： Viswanath Annampedu , Pervez Mirza Aziz
发明人： Viswanath Annampedu , Pervez Mirza Aziz
IPC分类号： G11B5/09 , G11B20/10
CPC分类号： G11B20/10055 , G11B5/09 , G11B5/5526 , G11B5/596 , G11B20/10009 , G11B20/1403 , H04L7/0029
摘要： Techniques for detecting data, such as servo data, from input or incoming data read from a transmission medium, such as magnetic recording medium, in the presence or absence of radial incoherence. In one illustrative recording medium-based aspect of the invention, such a technique for detecting data from input data stored on a recording medium comprises the following steps. First, one or more samples are interpolated from one or more samples which have been generated from the input data at a given symbol rate. The one or more interpolated samples have one or more phases associated therewith which differ from a phase associated with the one or more samples generated at the given symbol rate. Then, an optimum or best phase is selected from the symbol rate phase and the one or more interpolated phases such that at least a portion of the one or more samples associated with the optimum phase are identified as representative of detected data.

16. 发明授权

US08456775B2 Systems and methods for detecting a reference pattern 有权
标题翻译：用于检测参考图案的系统和方法
公开(公告)号：US08456775B2
公开(公告)日：2013-06-04
申请号：US12651280
申请日：2009-12-31
申请人： Jeffery Grundvig , Viswanath Annampedu , Jason Byrne , Keith Bloss
发明人： Jeffery Grundvig , Viswanath Annampedu , Jason Byrne , Keith Bloss
IPC分类号： G11B5/09
CPC分类号： G11B5/59655 , G11B5/09 , G11B5/59666 , G11B5/59688 , G11B20/10222 , G11B20/14 , G11B2020/1484 , G11B2220/2516
摘要： Various embodiments of the present invention provide systems and methods for locating a reference pattern on a storage medium. For example, various embodiments of the present invention provide systems for locating a reference pattern on a storage medium. Such systems include a sliding window phase calculator circuit, a delay circuit and a mark detector circuit.
摘要翻译：本发明的各种实施例提供了用于将参考图案定位在存储介质上的系统和方法。例如，本发明的各种实施例提供了用于将参考图案定位在存储介质上的系统。这样的系统包括滑动窗口相位计算器电路，延迟电路和标记检测器电路。

17. 发明授权

US08411385B2 Systems and methods for improved timing recovery 有权
标题翻译：改进定时恢复的系统和方法
公开(公告)号：US08411385B2
公开(公告)日：2013-04-02
申请号：US12972904
申请日：2010-12-20
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： G11B5/09
CPC分类号： G11B20/10222 , G11B20/10046 , G11B2220/2516 , H04L7/0025 , H04L7/0029 , H04L7/0337
摘要： Various embodiments of the present invention provide systems and methods for timing recovery. As an example, timing recovery circuits include: a first digital interpolation circuit, a second digital interpolation circuit, a phase selection circuit, and a sampling clock rotation circuit. The first digital interpolation circuit is operable to receive a data input and to provide a first interpolated output corresponding to a first phase, and the second digital interpolation circuit is operable to receive the data input and to provide a second interpolated output corresponding to a second phase. The phase selection circuit operable to select the first phase for processing, and the sampling clock rotation circuit is operable to move a sampling clock away from the first phase.
摘要翻译：本发明的各种实施例提供了用于定时恢复的系统和方法。作为示例，定时恢复电路包括：第一数字内插电路，第二数字内插电路，相位选择电路和采样时钟旋转电路。第一数字内插电路可操作以接收数据输入并提供对应于第一相位的第一内插输出，并且第二数字内插电路可操作以接收数据输入并提供对应于第二相位的第二内插输出。所述相位选择电路可操作以选择所述第一相进行处理，并且所述采样时钟旋转电路可操作以将取样时钟移动离开所述第一相位。

18. 发明申请

US20120182643A1 Systems and Methods for Reduced Format Data Processing 有权
标题翻译：减少格式数据处理的系统和方法
公开(公告)号：US20120182643A1
公开(公告)日：2012-07-19
申请号：US13009067
申请日：2011-01-19
申请人： Xun Zhang , Jeffrey Grundvig , Viswanath Annampedu
发明人： Xun Zhang , Jeffrey Grundvig , Viswanath Annampedu
IPC分类号： G11B5/596
CPC分类号： G11B20/10037 , G11B20/10027 , G11B20/10222 , G11B20/14 , G11B2020/1232 , G11B2020/1267 , G11B2220/2516
摘要： Various embodiments of the present invention provide systems and methods for data processing. For example, some embodiments of the present invention provide data processing circuits that include a variable gain amplifier circuit, an analog to digital conversion circuit, a cosine component calculation circuit, a sine calculation circuit, and a zero gain start calculation circuit. The variable gain amplifier circuit is operable to apply a gain to a data input corresponding to a gain feedback value and providing an amplified output. The analog to digital conversion circuit is operable to convert the amplified output to a corresponding series of digital samples. The cosine component calculation circuit is operable to calculate a cosine component from the series of digital samples, and the sine component calculation circuit operable to calculate a sine component from the series of digital samples. The zero gain start calculation circuit is operable to calculate a raw gain error value based on the cosine component and the sine component, where the gain feedback value is derived from the raw gain error value.
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。例如，本发明的一些实施例提供包括可变增益放大器电路，模数转换电路，余弦分量计算电路，正弦计算电路和零增益开始计算电路的数据处理电路。可变增益放大器电路可操作以将增益应用于对应于增益反馈值的数据输入并提供放大的输出。模数转换电路可操作以将放大的输出转换成相应的一系列数字采样。余弦分量计算电路可操作以从该系列数字采样中计算余弦分量，并且正弦分量计算电路用于从该系列数字样本计算正弦分量。零增益开始计算电路可操作以基于余弦分量和正弦分量来计算原始增益误差值，其中增益反馈值从原始增益误差值导出。

19. 发明申请

US20120026620A1 METHODS AND APPARATUS FOR GAIN ESTIMATION USING SERVO DATA WITH IMPROVED BIAS CORRECTION 有权
标题翻译：使用伺服数据进行增益估计的方法和装置改进偏差校正
公开(公告)号：US20120026620A1
公开(公告)日：2012-02-02
申请号：US12847661
申请日：2010-07-30
申请人： Viswanath Annampedu , Xun Zhang
发明人： Viswanath Annampedu , Xun Zhang
IPC分类号： G11B27/36
CPC分类号： G11B20/10305 , G11B20/10009
摘要： Methods and apparatus are provided for gain estimation using servo data with improved bias correction. The gain is estimated using a preamble in a servo sector by obtaining a first gain estimate using a first gain estimation algorithm (such as a Zero Gain Start Algorithm) and a first portion of the preamble; storing the first portion of the preamble in a memory buffer; obtaining a second gain estimate using a second gain estimation algorithm (such as a Zero Forcing algorithm) and the first portion of the preamble; and processing Servo Address Mark (SAM) and Gray data in the servo sector using the first gain estimate substantially simultaneous to the step of obtaining the second gain estimate. A gain error can be obtained by calculating a difference between the first gain estimate and the second gain estimate. The gain error can be used in burst processing of the servo data.
摘要翻译：提供了使用改进的偏差校正的伺服数据进行增益估计的方法和装置。通过使用第一增益估计算法（例如零增益启动算法）和前同步码的第一部分获得第一增益估计，使用伺服扇区中的前导码估计增益; 将前导码的第一部分存储在存储器缓冲器中; 使用第二增益估计算法（例如零强制算法）和前导码的第一部分获得第二增益估计; 以及基本上与获得第二增益估计的步骤同时使用第一增益估计来处理伺服扇区中的伺服地址标记（SAM）和灰数据。可以通过计算第一增益估计和第二增益估计之间的差来获得增益误差。增益误差可用于伺服数据的突发处理。

20. 发明授权

US08054931B2 Systems and methods for improved timing recovery 失效
标题翻译：改进定时恢复的系统和方法
公开(公告)号：US08054931B2
公开(公告)日：2011-11-08
申请号：US11841033
申请日：2007-08-20
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： H03D3/24
CPC分类号： H04L7/0054 , H03L7/085 , H03L7/093 , H04L7/0062 , H04L7/0083
摘要： Various embodiments of the present invention provide systems and methods for improved timing recovery. As one example, some embodiments of the present invention provide timing recovery circuits that include an error signal and a digital phase lock loop circuit. The error signal indicates a difference between the predicted sample time and an ideal sample time. The digital phase lock loop is operable to apply an adjustment value such that a subsequent sample time is moved toward the ideal sample time. Further, the digital phase lock loop circuit includes an adjustment limit circuit that is operable to limit the adjustment value.
摘要翻译：本发明的各种实施例提供了用于改进定时恢复的系统和方法。作为一个示例，本发明的一些实施例提供了包括误差信号和数字锁相环电路的定时恢复电路。误差信号表示预测采样时间与理想采样时间之间的差异。数字锁相环可操作以应用调整值，使得随后的采样时间朝向理想采样时间移动。此外，数字锁相环电路包括可操作以限制调整值的调节限制电路。

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