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：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：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。

公开(公告)号：US07486215B1

公开(公告)日：2009-02-03

申请号：US11894417

申请日：2007-08-20

申请人： Hongxin Song ,  Zining Wu

发明人： Hongxin Song ,  Zining Wu

IPC分类号： H03M3/00

CPC分类号： H03M1/1295

摘要： Apparatuses, methods, and circuits for analog signal adjustment (or baseline loop cancellation) are disclosed. In one embodiment, an apparatus for adjusting an analog input signal includes a first mixer for combining the analog input signal and an adjustment signal; an analog signal conditioning circuit that receives an output from the first mixer and provides a conditioned analog signal; an analog-to-digital converter (ADC) that converts the conditioned analog signal to a first digital signal; a first logic block that provides a correction signal and the adjustment signal; and a second mixer that combines the first digital signal and the correction signal, and provides a digital output signal.

摘要翻译： 公开了用于模拟信号调整（或基线回路消除）的装置，方法和电路。 在一个实施例中，一种用于调整模拟输入信号的装置包括用于组合模拟输入信号和调整信号的第一混频器; 模拟信号调理电路，其接收来自所述第一混频器的输出并提供经调节的模拟信号; 模数转换器（ADC），其将经调节的模拟信号转换为第一数字信号; 提供校正信号和调整信号的第一逻辑块; 以及组合第一数字信号和校正信号并提供数字输出信号的第二混频器。

公开(公告)号：US08359527B1

公开(公告)日：2013-01-22

申请号：US13445712

申请日：2012-04-12

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. A described system includes a filter, buffer, detector, controller, and averager. The buffer can store a group of signals, including a filtered digital signal and previous signal(s). The controller can determine whether first discrete values are adequately indicated and initiate a retry mode when the first discrete values are not adequately indicated. The averager can produce a new signal, in the retry mode, based on an average of at least a portion of the group of signals. The detector can interpret the new signal as second discrete values. The controller can determine whether the second discrete values are adequately indicated based on a measurement of differences between hard decisions indicated by the new signal and hard decisions indicated by the filtered digital signal. The controller can selectively exclude a signal of the group of signals from the average.

摘要翻译： 在嘈杂频道上解码信号的系统和技术。 所描述的系统包括滤波器，缓冲器，检测器，控制器和平均器。 缓冲器可以存储一组信号，包括经滤波的数字信号和先前的信号。 控制器可以确定第一离散值是否被充分地指示，并且当第一个离散值没有充分地指示时，控制器可以启动重试模式。 平均器可以在重试模式下基于该组信号的至少一部分的平均值产生新的信号。 检测器可以将新信号解释为第二离散值。 控制器可以基于由新信号指示的硬判决与经滤波的数字信号指示的硬判决之间的差异的测量来确定第二离散值是否被充分地指示。 控制器可以从平均值中选择性地排除信号组的信号。

公开(公告)号：US08161361B1

公开(公告)日：2012-04-17

申请号：US10600419

申请日：2003-06-20

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. In general, in one implementation, the technique includes: interpreting an input signal as discrete values, and in response to an inadequate signal, averaging multiple signals to improve interpretation of the input signal. The input signal can be a read signal from a storage medium, such as those found in disk drives. A read channel can include a buffer and an averaging circuit capable of different signal averaging approaches in a retry mode, including making signal averaging decisions based on a signal quality measure. Buffering read signals can be done in alternative locations in the read channel and can involve buffering of many prior read signals and/or buffering of an averaged read signal.

摘要翻译： 在嘈杂频道上解码信号的系统和技术。 通常，在一个实现中，该技术包括：将输入信号解释为离散值，并且响应于不足的信号，对多个信号进行平均以改善输入信号的解释。 输入信号可以是来自存储介质的读取信号，例如在磁盘驱动器中发现的信号。 读通道可以包括缓冲器和能够在重试模式下具有不同信号平均方法的平均电路，包括基于信号质量测量进行信号平均判定。 缓冲读取信号可以在读通道中的替代位置进行，并且可以涉及缓冲许多先前的读取信号和/或缓冲平均的读取信号。

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：US07755522B1

公开(公告)日：2010-07-13

申请号：US12339002

申请日：2008-12-18

申请人： Hongxin Song ,  Zining Wu

发明人： Hongxin Song ,  Zining Wu

IPC分类号： H03M1/10

CPC分类号： H03M1/1295

摘要： Apparatuses, methods, and circuits for analog signal adjustment (or baseline loop cancellation) are disclosed. In one embodiment, an apparatus for adjusting an analog input signal includes a first mixer for combining the analog input signal and an adjustment signal; an analog signal conditioning circuit that receives an output from the first mixer and provides a conditioned analog signal; an analog-to-digital converter (ADC) that converts the conditioned analog signal to a first digital signal; a first logic block that provides a correction signal and the adjustment signal; and a second mixer that combines the first digital signal and the correction signal, and provides a digital output signal.

摘要翻译： 公开了用于模拟信号调整（或基线回路消除）的装置，方法和电路。 在一个实施例中，一种用于调整模拟输入信号的装置包括用于组合模拟输入信号和调整信号的第一混频器; 模拟信号调理电路，其接收来自所述第一混频器的输出并提供经调节的模拟信号; 模数转换器（ADC），其将经调节的模拟信号转换为第一数字信号; 提供校正信号和调整信号的第一逻辑块; 以及组合第一数字信号和校正信号并提供数字输出信号的第二混频器。

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。