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1. 发明授权

US09093096B2 Flaw scan circuit for repeatable run out (RRO) data 有权
标题翻译：缺陷扫描电路可重复耗尽（RRO）数据
公开(公告)号：US09093096B2
公开(公告)日：2015-07-28
申请号：US13559744
申请日：2012-07-27
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： G06F11/07 , G11B5/596
CPC分类号： G11B5/59627
摘要： Improved flaw scan circuits are provided for repeatable run out data. RRO (repeatable run out) data is processed by counting a number of RRO data bits detected in a servo sector; and setting an RRO flaw flag if at least a specified number of RRO data bits is not detected in the server sector. The RRO flaw flag can also optionally be set by detecting an RRO address mark in the servo sector; counting a number of samples in the servo sector after the RRO address mark that do not satisfy a quality threshold; and setting the RRO flaw flag when the counted number of samples that do not satisfy the quality threshold exceeds a specified flaw threshold. If the RRO flaw flag is set, the RRO data can be discarded, and/or an error recovery mechanism can be implemented to obtain the RRO data.
摘要翻译：提供改进的缺陷扫描电路用于可重复的耗尽数据。通过对在伺服扇区中检测到的RRO数据位的数量进行计数来处理RRO（可重复耗尽）数据; 并且如果在服务器扇区中未检测到至少指定数量的RRO数据位，则设置RRO缺陷标志。还可以通过检测伺服扇区中的RRO地址标记来可选地设置RRO缺陷标志; 在不满足质量阈值的RRO地址标记之后对伺服扇区中的多个样本进行计数; 并且当不满足质量阈值的计数的样本数超过规定的缺陷阈值时，设置RRO缺陷标志。如果设置了RRO缺陷标志，则可以丢弃RRO数据，并且/或者可以实现错误恢复机制以获得RRO数据。

2. 发明申请

US20140029129A1 METHODS AND APPARATUS FOR IMPROVED DETECTION OF SERVO SECTOR DATA USING SINGLE BIT ERROR CORRECTION 有权
标题翻译：使用单位错误校正改进检测伺服系统数据的方法和装置
公开(公告)号：US20140029129A1
公开(公告)日：2014-01-30
申请号：US13559747
申请日：2012-07-27
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： G11B20/18 , G11B5/09
CPC分类号： G11B5/59688 , G11B5/59627 , G11B20/18
摘要： Methods and apparatus are provided for improved detection of servo sector data in a magnetic recording system using single bit error correction. Servo sector data is processed by detecting the servo sector data; determining whether a single bit error occurred in the detected servo sector data; and flipping a bit value of an individual bit in the detected servo sector data having a lowest amplitude sample among the samples of the detected servo sector data when a single bit error is detected in the detected servo sector data. The servo sector data comprises, for example, a servo address mark, Gray data, an RRO address mark and/or RRO data. For example, the bit value can be flipped by changing a binary value of one to a binary value of zero and changing a binary value of zero to a binary value of one.
摘要翻译：提供了使用单位错误校正在磁记录系统中改善伺服扇区数据检测的方法和装置。通过检测伺服扇区数据来处理伺服扇区数据; 确定在检测到的伺服扇区数据中是否发生单个位错误; 以及在检测到的伺服扇区数据中检测到单个位错误时，在检测到的伺服扇区数据的样本中，翻转检测到的具有最低振幅采样的伺服扇区数据中的各个位的位值。伺服扇区数据例如包括伺服地址标记，灰色数据，RRO地址标记和/或RRO数据。例如，可以通过将二进制值1改变为二进制值零并将二进制值改变为二进制值1来翻转位值。

3. 发明申请

US20120197920A1 SYSTEMS AND METHODS FOR DIVERSITY COMBINED DATA DETECTION 有权
标题翻译：用于多样性组合数据检测的系统和方法
公开(公告)号：US20120197920A1
公开(公告)日：2012-08-02
申请号：US13014754
申请日：2011-01-27
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： G06F17/30
CPC分类号： G11B20/1403 , G11B20/10296 , G11B2020/1281
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 including a pattern detection circuit having at least two data detector circuits each operable to receive the same series of data samples and to provide a first detected data output and a second detected data output, respectively. In addition, the data pattern detection circuit includes a result combining circuit that is operable to assert a pattern found output based at least in part on the first detected data output and the second detected data output.
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数据处理电路，其包括具有至少两个数据检测器电路的模式检测电路，每个数据检测器电路可操作以接收同一系列数据样本，并提供第一检测数据输出和第二检测数据输出，分别。此外，数据图案检测电路包括结果组合电路，其可操作以至少部分地基于第一检测数据输出和第二检测数据输出来断言发现的输出。

4. 发明申请

US20120155587A1 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：US20120155587A1
公开(公告)日：2012-06-21
申请号：US12972904
申请日：2010-12-20
申请人： Viswanath Annampedu
发明人： Viswanath Annampedu
IPC分类号： H04L7/00 , H03M1/12
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。

5. 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。

6. 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。

7. 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。

8. 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。

9. 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.

10. 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。

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