公开(公告)号：US08315132B1

公开(公告)日：2012-11-20

申请号：US13235658

申请日：2011-09-19

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。

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。

公开(公告)号：US09048879B1

公开(公告)日：2015-06-02

申请号：US13586710

申请日：2012-08-15

申请人： Shaohua Yang ,  Zining Wu ,  Gregory Burd ,  Xueshi Yang ,  Hongwei Song ,  Nedeljko Varnica

发明人： Shaohua Yang ,  Zining Wu ,  Gregory Burd ,  Xueshi Yang ,  Hongwei Song ,  Nedeljko Varnica

IPC分类号： H03M13/29 ,  H04L1/00

CPC分类号： H03M13/2945 ,  H03M13/098 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/23 ,  H03M13/2909 ,  H03M13/2957 ,  H03M13/3746 ,  H04L1/0065

摘要： An error correction system includes an iterative code that employs an interleaved component code and an embedded parity component code. In some embodiments, on the transmission side, input signals received at an input node are encoded based on the interleaved code, which encodes an interleaved version of the input data to produce a first set of codewords. At least a portion of the first set of codewords preferably is divided into a plurality of symbols which are encoded based on the embedded parity code to provide encoded data. Similarly, in some embodiments, on the receiving side, received data are detected to produce detected information and soft outputs. The detected information is decoded based on the embedded parity code to obtain decoded information. The decoded information preferably is used, together with other soft information, by an interleaved decoder to generate reliability metrics for biasing a subsequent decoding iteration.

摘要翻译： 纠错系统包括使用交织分量代码和嵌入奇偶校验分量代码的迭代代码。 在一些实施例中，在传输侧，在输入节点处接收的输入信号基于交织的代码进行编码，该代码编码输入数据的交错版本以产生第一组码字。 第一组码字的至少一部分优选地被划分为多个符号，这些符号基于嵌入的奇偶校验码被编码以提供编码数据。 类似地，在一些实施例中，在接收侧，检测所接收的数据以产生检测到的信息和软输出。 检测到的信息根据嵌入的奇偶校验码进行解码以获得解码的信息。 解码的信息优选地与其他软信息一起被交织的解码器使用以产生用于偏置随后的解码迭代的可靠性度量。

公开(公告)号：US08255763B1

公开(公告)日：2012-08-28

申请号：US11937389

申请日：2007-11-08

申请人： Shaohua Yang ,  Zining Wu ,  Gregory Burd ,  Xueshi Yang ,  Hongwei Song ,  Nedeljko Varnica

发明人： Shaohua Yang ,  Zining Wu ,  Gregory Burd ,  Xueshi Yang ,  Hongwei Song ,  Nedeljko Varnica

IPC分类号： H03M13/00

CPC分类号： H03M13/2945 ,  H03M13/098 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/23 ,  H03M13/2909 ,  H03M13/2957 ,  H03M13/3746 ,  H04L1/0065

摘要： An error correction system includes an iterative code that employs an interleaved component code and an embedded parity component code. On the transmission side, input signals received at an input node are encoded based on the interleaved code, which encodes an interleaved version of the input data to produce a first set of codewords. A portion of the first set of codewords is divided into a plurality of symbols which are encoded based on the embedded parity code. On the receiving side, received data are detected to produce detected information and soft outputs. The detected information is decoded based on the embedded parity code to obtain decoded information. The decoded information is used with other soft information by an interleaved decoder to generate reliability metrics for biasing a subsequent decoding iteration.

摘要翻译： 纠错系统包括使用交织分量代码和嵌入奇偶校验分量代码的迭代代码。 在发送侧，在输入节点处接收的输入信号基于交织代码进行编码，该代码对输入数据的交织版本进行编码以产生第一组码字。 第一组码字的一部分被分成多个符号，这些符号是基于嵌入的奇偶校验码进行编码的。 在接收侧，检测接收到的数据以产生检测信息和软输出。 检测到的信息根据嵌入的奇偶校验码进行解码以获得解码的信息。 经解码的信息与交织的解码器的其他软信息一起使用以产生用于偏置随后的解码迭代的可靠性度量。

公开(公告)号：US08090059B1

公开(公告)日：2012-01-03

申请号：US11799488

申请日：2007-05-01

申请人： Hongwei Song ,  Zining Wu ,  Shaohua Yang

发明人： Hongwei Song ,  Zining Wu ,  Shaohua Yang

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L1/0054 ,  G11B20/1803 ,  H03M13/3746 ,  H03M13/41 ,  H03M13/6343

摘要： A detector includes Viterbi detectors. A first Viterbi detector generates a preliminary decision signal. A second Viterbi detector generates a final decision signal based on an input data signal and the preliminary decision signal. The second Viterbi detector is arranged in series with the first Viterbi detector.

摘要翻译： 检测器包括维特比检测器。 第一维特比检测器产生初步判定信号。 第二维特比检测器基于输入数据信号和初步判定信号产生最终判定信号。 第二维特比检测器与第一维特比检测器串联布置。

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。

公开(公告)号：US08594246B1

公开(公告)日：2013-11-26

申请号：US13335267

申请日：2011-12-22

申请人： Hongwei Song ,  Zining Wu ,  Shaohua Yang

发明人： Hongwei Song ,  Zining Wu ,  Shaohua Yang

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L1/0054 ,  G11B20/1803 ,  H03M13/3746 ,  H03M13/41 ,  H03M13/6343

摘要： A circuit includes a first Viterbi detector configured to generate a first estimate signal based on an equalized signal. The first estimate signal includes preliminary non-return-to-zero data estimates. A first filter is configured to generate a first filtered signal based on a preliminary decision signal. The preliminary decision signal is generated based on the first estimate signal. A second Viterbi detector is in communication with the first Viterbi detector. The second Viterbi detector is configured to generate a final decision signal based on a sum of (i) a delayed version of the equalized signal, and (ii) the first filtered signal, wherein the final decision signal comprises final non-return-to-zero estimates.

摘要翻译： 电路包括第一维特比检测器，其经配置以基于均衡信号产生第一估计信号。 第一个估计信号包括初步的无归零数据估计。 第一滤波器被配置为基于初步判定信号产生第一滤波信号。 基于第一估计信号产生初步判定信号。 第二维特比检测器与第一维特比检测器通信。 第二维特比检测器被配置为基于（i）均衡信号的延迟版本和（ii）第一滤波信号的和产生最终判定信号，其中最终判决信号包括最终的不返回 - 零估计。

公开(公告)号：US08462897B1

公开(公告)日：2013-06-11

申请号：US13415465

申请日：2012-03-08

申请人： Hongxin Song ,  Seo-How Low ,  Panu Chaichanavong ,  Zining Wu

发明人： Hongxin Song ,  Seo-How Low ,  Panu Chaichanavong ,  Zining Wu

IPC分类号： H03H7/30

CPC分类号： H04B1/16 ,  H04L25/03197

摘要： A non-linear detector for detecting signals with signal-dependent noise is disclosed. The detector may choose a data sequence that maximizes the conditional probability of detecting the channel data. Since the channel may be time-varying and the precise channel characteristics may be unknown, the detector may adapt one or more branch metric parameters before sending the parameters to a loading block. In the loading block, the branch metric parameters may be normalized and part of the branch metric may be pre-computed to reduce the complexity of the detector. The loading block may then provide the branch metric parameters and any pre-computation to the detector. The detector may then calculate the branch metric associated with the input signal and output the channel data.

公开(公告)号：US08160181B1

公开(公告)日：2012-04-17

申请号：US11493269

申请日：2006-07-25

申请人： Hongxin Song ,  Seo-How Low ,  Panu Chaichanavong ,  Zining Wu

发明人： Hongxin Song ,  Seo-How Low ,  Panu Chaichanavong ,  Zining Wu

IPC分类号： H03H7/30

CPC分类号： H04B1/16 ,  H04L25/03197

摘要： A non-linear detector for detecting signals with signal-dependent noise is disclosed. The detector may choose a data sequence that maximizes the conditional probability of detecting the channel data. Since the channel may be time-varying and the precise channel characteristics may be unknown, the detector may adapt one or more branch metric parameters before sending the parameters to a loading block. In the loading block, the branch metric parameters may be normalized and part of the branch metric may be pre-computed to reduce the complexity of the detector. The loading block may then provide the branch metric parameters and any pre-computation to the detector. The detector may then calculate the branch metric associated with the input signal and output the channel data.

摘要翻译： 公开了一种用于检测具有信号相关噪声的信号的非线性检测器。 检测器可以选择使检测通道数据的条件概率最大化的数据序列。 由于信道可能是时变的并且精确的信道特性可能是未知的，所以在将参数发送到加载块之前，检测器可以调整一个或多个分支度量参数。 在加载块中，分支度量参数可以被归一化，并且可以预先计算分支度量的一部分以降低检测器的复杂度。 然后，加载块可以向检测器提供分支度量参数和任何预计算。 然后，检测器可以计算与输入信号相关联的分支量度并输出通道数据。

公开(公告)号：US08589774B1

公开(公告)日：2013-11-19

申请号：US13745655

申请日：2013-01-18

申请人： Hongxin Song ,  Zining Wu

发明人： Hongxin Song ,  Zining Wu

IPC分类号： H03M13/03

CPC分类号： H03M13/3738 ,  G11B20/10027 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10175 ,  G11B20/10277 ,  G11B20/10305 ,  G11B20/1037 ,  G11B20/10527 ,  G11B20/18 ,  G11B20/1816 ,  G11B20/1876 ,  G11B20/24 ,  G11B2020/10694 ,  G11B2020/183 ,  G11B2220/2516 ,  H03M5/145 ,  H03M13/3784 ,  H03M13/4138

摘要： Systems and techniques to interpret signals on a noisy channel are described. A described technique includes storing a group of signals including a filtered digital signal and one or more previous signals, the filtered digital signal being based on an analog signal; interpreting the filtered digital signal as first discrete values; determining whether the first discrete values are adequately indicated based on a result of the interpreting; initiating a retry mode when the first discrete values are not adequately indicated; producing, in the retry mode, a new signal, the new signal being determined based on an average of at least a portion of the group of signals; interpreting, in the retry mode, the new signal as second discrete values; and determining whether the second discrete values are adequately indicated based on hard decisions indicated by the new signal and hard decisions indicated by the filtered digital signal.

摘要翻译： 描述了在噪声信道上解释信号的系统和技术。 所描述的技术包括存储包括经滤波的数字信号和一个或多个先前信号的一组信号，滤波后的数字信号基于模拟信号; 将经滤波的数字信号解释为第一离散值; 基于所述解释的结果来确定所述第一离散值是否被充分地指示; 当第一离散值未被充分表示时，启动重试模式; 在重试模式下产生一个新信号，该新信号是基于该组信号的至少一部分的平均值来确定的; 在重试模式下将新信号解释为第二离散值; 以及基于由所述新信号指示的硬判决和由所述滤波数字信号指示的硬判决来确定所述第二离散值是否被充分地指示。