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71. 发明授权

US08089713B2 Detection of hard-disc defect regions using soft decisions 有权
标题翻译：使用软判决检测硬盘缺陷区域
公开(公告)号：US08089713B2
公开(公告)日：2012-01-03
申请号：US12731381
申请日：2010-03-25
申请人： Shaohua Yang , Weijun Tan
发明人： Shaohua Yang , Weijun Tan
IPC分类号： G11B27/36 , H03M13/03
CPC分类号： G11B20/1816 , G11B20/10009 , H03M13/41
摘要： In a hard-disc drive, a defect region on the hard disc is detected by generating two statistical measures (e.g., β1(k) and β2(k)) based on signal values (e.g., x[n] or y[n]) and soft-decision values (e.g., L[n]) corresponding to the signal values. The measures are compared to detect the location of the defect region of the hard drive. Using the soft-decision values reduces fluctuations in a ratio of the statistical measures compared to a ratio formed from statistical measures that are not based on soft-decision values, resulting in a more-reliable test for detecting defect regions.
摘要翻译：在硬盘驱动器中，通过基于信号值（例如，x [n]或x（n））生成两个统计度量（例如，＆bgr; 1（k）和＆bgr; 2（k））来检测硬盘上的缺陷区域 y [n]）和软判决值（例如，L [n]）。比较措施来检测硬盘驱动器缺陷区域的位置。使用软判决值可减少统计度量与由不基于软判决值的统计测量形成的比率的比率的波动，导致检测缺陷区域的更可靠的测试。

72. 发明授权

US08054717B1 Defect detection design 有权
标题翻译：缺陷检测设计
公开(公告)号：US08054717B1
公开(公告)日：2011-11-08
申请号：US11907676
申请日：2007-10-16
申请人： Shaohua Yang , Hongwei Song , Zining Wu , Xueshi Yang , Hongxin Song
发明人： Shaohua Yang , Hongwei Song , Zining Wu , Xueshi Yang , Hongxin Song
IPC分类号： G11B15/52
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10296 , G11B20/1816
摘要： A system and method are provided to detect defects in a data storage medium by sampling data read from the data storage medium. Time referenced samples of data read from the data storage medium are equalized to mediate the effects of channel noise and the equalized samples are decoded by a decoder, such as a Viterbi decoder. The decoded signal is then reconstructed through a reconstruction filter to approximate the equalized signal. The equalized data signal and the reconstructed data signal are then combined and compared in a bit-by-bit deconstruction scheme to determine, based on a variation between the signal elements, that a defect exists on the data storage medium. Additional action is then taken to mediate the effects of attempting to process corrupted data based on the defect by isolating the defective bit.
摘要翻译：提供了一种系统和方法，用于通过对从数据存储介质读取的数据进行采样来检测数据存储介质中的缺陷。将从数据存储介质读取的数据的时间参考样本相等以调解信道噪声的影响，并且均衡样本由诸如维特比解码器之类的解码器解码。然后通过重建滤波器重建经解码的信号以近似均衡的信号。然后将均衡的数据信号和重建的数据信号以逐位解构方案进行组合和比较，以基于信号元素之间的变化来确定数据存储介质上存在缺陷。然后采取额外的行动来通过隔离有缺陷的位来调解基于缺陷来处理被破坏的数据的效果。

73. 发明申请

US20110264987A1 Systems and Methods for Low Density Parity Check Data Encoding 有权
标题翻译：低密度奇偶校验数据编码系统与方法
公开(公告)号：US20110264987A1
公开(公告)日：2011-10-27
申请号：US12767761
申请日：2010-04-26
申请人： Zongwang Li , Kiran Gunnam , Shaohua Yang
发明人： Zongwang Li , Kiran Gunnam , Shaohua Yang
IPC分类号： H03M13/07 , G06F11/10 , H03M13/05
CPC分类号： H03M13/118 , H03M13/116 , H03M13/611
摘要： Various embodiments of the present invention provide systems and methods for encoding data. As an example, a data encoding circuit is disclosed that includes a first stage data encoder circuit and a second stage data encoder circuit. The first stage data encoder circuit is operable to provide a first stage output. The first stage data encoder circuit includes a first vector multiplier circuit operable to receive a data input and to multiply the data input by a first sparse matrix to yield a first interim value. The second stage encoder circuit includes a second vector multiplier circuit operable to multiply the first stage output by a second sparse matrix to yield a second interim value.
摘要翻译：本发明的各种实施例提供了用于编码数据的系统和方法。作为示例，公开了包括第一级数据编码器电路和第二级数据编码器电路的数据编码电路。第一级数据编码器电路可操作以提供第一级输出。第一级数据编码器电路包括第一向量乘法器电路，其可操作以接收数据输入，并将输入的数据乘以第一稀疏矩阵以产生第一临时值。第二级编码器电路包括第二矢量乘法器电路，其可操作以将第一级输出乘以第二稀疏矩阵以产生第二中间值。

74. 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。

75. 发明授权

US08027378B1 Circuits, architectures, apparatuses, systems, algorithms and methods and software for amplitude drop detection 有权
标题翻译：用于幅度下降检测的电路，架构，设备，系统，算法和方法以及软件
公开(公告)号：US08027378B1
公开(公告)日：2011-09-27
申请号：US11818079
申请日：2007-06-12
申请人： Shaohua Yang , Hongwei Song , Zining Wu
发明人： Shaohua Yang , Hongwei Song , Zining Wu
IPC分类号： H04B3/46 , H04B17/00 , H04Q1/20
CPC分类号： H04B3/46 , H04L1/0054 , H04L1/20
摘要： Methods, circuits, systems, and networks for detecting an amplitude drop in an incoming signal. The methods generally comprise sampling the incoming signal at regular intervals to produce a plurality of sample values, producing a plurality of drop flags in response to the plurality of sample values, and detecting the amplitude drop in response to at least two of the drop flags. The circuits generally comprise a sampling circuit configured to produce a sample signal in response to the incoming signal, a threshold circuit configured to receive the sample signal and to produce a drop flag signal in response to the sample signal, and a drop detection circuit configured to produce an amplitude drop signal in response to at least two values of the drop flag signal. The systems and networks generally comprise the present circuits and/or any circuit embodying the inventive concepts described herein. The present invention advantageously provides for detection of amplitude drops in an incoming signal, operating in the digital (rather than analog) domain. Embodiments of the present invention also reduce the incidence of “false positives” due to transient low amplitudes. Correct detection of amplitude drops can improve the accuracy of signal decoders.
摘要翻译：用于检测输入信号中的幅度下降的方法，电路，系统和网络。所述方法通常包括以规则的间隔对输入信号进行采样以产生多个采样值，响应于多个采样值产生多个下降标志，以及响应于至少两个下降标志来检测幅度下降。电路通常包括采样电路，其被配置为响应于输入信号产生采样信号;阈值电路，被配置为接收采样信号并响应于采样信号产生降幅标志信号;以及丢弃检测电路，被配置为响应于液滴标志信号的至少两个值产生幅度下降信号。系统和网络通常包括本发明的电路和/或体现本文所描述的发明概念的任何电路。本发明有利地提供了在数字（而不是模拟）域中操作的输入信号中的幅度下降的检测。本发明的实施例还降低了由于瞬时低振幅引起的“假阳性”的发生率。正确检测幅度可以提高信号解码器的精度。

76. 发明申请

US20100275096A1 Systems and Methods for Hard Decision Assisted Decoding 有权
标题翻译：硬判决辅助解码的系统和方法
公开(公告)号：US20100275096A1
公开(公告)日：2010-10-28
申请号：US12430927
申请日：2009-04-28
申请人： Hao Zhong , Shaohua Yang , Weijun Tan , Changyou Xu , Yuan Xing Lee
发明人： Hao Zhong , Shaohua Yang , Weijun Tan , Changyou Xu , Yuan Xing Lee
IPC分类号： H03M13/00 , G06F11/00
CPC分类号： H03M13/1111 , H03M13/1108 , H03M13/1128 , H03M13/3715 , H03M13/6331
摘要： Various embodiments of the present invention provide systems and methods for data processing. For example, a data processing system is disclosed that includes a processing loop circuit having a data detector and a soft decision decoder. The data detector provides a detected output, and the soft decision decoder applies a soft decoding algorithm to a derivative of the detected output to yield a soft decision output and a first hard decision output. The systems further include a queuing buffer and a hard decision decoder. The queuing buffer is operable to store the soft decision output, and the hard decision decoder accesses the soft decision output and applies a hard decoding algorithm to yield a second hard decision output. The data detector is operable to perform a data detection on a derivative of the soft decision output if the soft decision decoder and the hard decision decoder fail to converge
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，公开了一种包括具有数据检测器和软判决解码器的处理环路电路的数据处理系统。数据检测器提供检测输出，软判决解码器将软解码算法应用于检测输出的导数，以产生软决策输出和第一硬决策输出。该系统还包括排队缓冲器和硬判决解码器。排队缓冲器可操作以存储软判决输出，并且硬判决解码器访问软决策输出并应用硬解码算法以产生第二硬决策输出。如果软判决解码器和硬判决解码器不能收敛，则数据检测器可操作以对软决策输出的导数执行数据检测

77. 发明申请

US20100269026A1 ERROR PATTERN GENERATION FOR TRELLIS-BASED DETECTION AND/OR DECODING 有权
标题翻译：基于TRLLIS的检测和/或解码的错误模式生成
公开(公告)号：US20100269026A1
公开(公告)日：2010-10-21
申请号：US12824517
申请日：2010-06-28
申请人： Shaohua Yang , Seo-How Low , Zining Wu , Gregory Burd
发明人： Shaohua Yang , Seo-How Low , Zining Wu , Gregory Burd
IPC分类号： H03M13/41 , H03M13/03 , G06F11/00
CPC分类号： H03M13/4192 , H03M13/098 , H03M13/3994 , H03M13/4138 , H03M13/4161 , H03M13/4169
摘要： The disclosed technology provides systems and methods for identifying potential error locations, patterns, and likelihood metrics in connection with trellis-based detection/decoding. In one aspect of the invention, the disclosed technology detects information that was previously encoded based on a trellis, and decodes the detected information based on the trellis to provide decoded information. The decoded information corresponds to a winning path through the trellis that ends at a winning state. The disclosed technology can identify one or more alternate paths through the trellis that also end at the winning state, and can generate a potential error pattern for each of the alternate paths.
摘要翻译：所公开的技术提供用于识别与基于网格的检测/解码相关的潜在错误位置，模式和似然度量的系统和方法。在本发明的一个方面，所公开的技术检测先前基于网格编码的信息，并且基于网格对检测到的信息进行解码以提供解码信息。解码的信息对应于通过在获胜状态结束的网格的获胜路径。所公开的技术可以识别通过网格的一个或多个备选路径，其也以胜利状态结束，并且可以为每个备选路径生成潜在的错误模式。

78. 发明授权

US07765458B1 Error pattern generation for trellis-based detection and/or decoding 有权
标题翻译：基于网格的检测和/或解码的错误模式生成
公开(公告)号：US07765458B1
公开(公告)日：2010-07-27
申请号：US11518020
申请日：2006-09-08
申请人： Shaohua Yang , Seo-How Low , Zining Wu , Gregory Burd
发明人： Shaohua Yang , Seo-How Low , Zining Wu , Gregory Burd
IPC分类号： H03M13/41
CPC分类号： H03M13/4192 , H03M13/098 , H03M13/3994 , H03M13/4138 , H03M13/4161 , H03M13/4169
摘要： The disclosed technology provides systems and methods for identifying potential error locations, patterns, and likelihood metrics in connection with trellis-based detection/decoding. In one aspect of the invention, the disclosed technology detects information that was previously encoded based on a trellis, and decodes the detected information based on the trellis to provide decoded information. The decoded information corresponds to a winning path through the trellis that ends at a winning state. The disclosed technology can identify one or more alternate paths through the trellis that also end at the winning state, and can generate a potential error pattern for each of the alternate paths.
摘要翻译：所公开的技术提供用于识别与基于网格的检测/解码相关的潜在错误位置，模式和似然度量的系统和方法。在本发明的一个方面，所公开的技术检测先前基于网格编码的信息，并且基于网格对检测到的信息进行解码以提供解码信息。解码的信息对应于通过在获胜状态结束的网格的获胜路径。所公开的技术可以识别通过网格的一个或多个备选路径，其也以胜利状态结束，并且可以为每个备选路径生成潜在的错误模式。

79. 发明申请

US20100042906A1 ADJUSTING SOFT-OUTPUT VALUES IN TURBO EQUALIZATION SCHEMES TO BREAK TRAPPING SETS 有权
标题翻译：在涡轮均衡方案中调整软输出值以打破陷阱
公开(公告)号：US20100042906A1
公开(公告)日：2010-02-18
申请号：US12540078
申请日：2009-08-12
申请人： Kiran Gunnam , Shaohua Yang , Changyou Xu
发明人： Kiran Gunnam , Shaohua Yang , Changyou Xu
IPC分类号： H03M13/45 , H03M13/05
CPC分类号： H03M13/1111 , H03M13/09 , H03M13/1142 , H03M13/3707 , H03M13/3738 , H03M13/3753 , H03M13/451
摘要： In one embodiment, a turbo equalizer has an LDPC decoder, a channel detector, and one or more adjustment blocks for recovering an LDPC codeword from a set of input samples. The decoder attempts to recover the codeword from an initial set of channel soft-output values and generates a set of extrinsic soft-output values, each corresponding to a bit of the codeword. If the decoder converges on a trapping set, then the channel detector performs detection on the set of input samples to generate a set of updated channel soft-output values, using the extrinsic soft-output values to improve the detection. The one or more adjustment blocks adjust at least one of (i) the extrinsic soft-output values before the channel detection and (ii) the updated channel soft-output values. Subsequent decoding is then performed on the updated and possibly-adjusted channel soft-output values to attempt to recover the codeword.
摘要翻译：在一个实施例中，turbo均衡器具有LDPC解码器，信道检测器和用于从一组输入采样中恢复LDPC码字的一个或多个调整块。解码器尝试从初始的信道软输出值集合中恢复码字，并产生一组非本征软输出值，每个对应于码字的位。如果解码器收敛于捕获集合，则信道检测器对输入样本集执行检测，以使用外部软输出值来生成一组更新的信道软输出值，以改善检测。一个或多个调整块调整（i）信道检测之前的非本征软输出值和（ii）更新的信道软输出值中的至少一个。然后对更新的和可能调整的信道软输出值执行随后的解码，以尝试恢复码字。

80. 发明申请

US20090235116A1 Systems and Methods for Regenerating Data from a Defective Medium 失效
标题翻译：从有缺陷的介质再生数据的系统和方法
公开(公告)号：US20090235116A1
公开(公告)日：2009-09-17
申请号：US12111902
申请日：2008-04-29
申请人： Weijun Tan , Shaohua Yang , George Mathew , Kelly Fitzpatrick , Hao Zhong , Yuan Xing Lee
发明人： Weijun Tan , Shaohua Yang , George Mathew , Kelly Fitzpatrick , Hao Zhong , Yuan Xing Lee
IPC分类号： G06F11/07
CPC分类号： G06F11/0793 , G06F11/0727 , G11B20/1816
摘要： Various embodiments of the present invention provide systems and methods for data regeneration. For example, a system for data regeneration is disclosed that includes a data input derived from the medium. A data detector and a data recovery system receive the data input. The data detector provides a first soft output, and the data recovery system provides a second soft output. The first soft output and the second soft output are provided to a multiplexer. A media defect detector performs a media defect detection process, and provides a defect flag that indicates whether the data input is derived form a defective portion of the medium. The defect flag is provided to the multiplexer where it is used to select whether the first soft output or the second soft output is provides as an extrinsic output.
摘要翻译：本发明的各种实施例提供了用于数据再生的系统和方法。例如，公开了一种用于数据再生的系统，其包括从介质导出的数据输入。数据检测器和数据恢复系统接收数据输入。数据检测器提供第一软输出，数据恢复系统提供第二软输出。第一软输出和第二软输出被提供给多路复用器。介质缺陷检测器执行介质缺陷检测处理，并且提供指示数据输入是否从介质的缺陷部分导出的缺陷标志。缺陷标志被提供给多路复用器，其中它用于选择第一软输出或第二软输出是作为外在输出提供。

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