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    Systems and methods for improved short media defect detection
    2.
    发明授权
    Systems and methods for improved short media defect detection 有权
    改进短介质缺陷检测的系统和方法

    公开(公告)号：US08732562B2

    公开(公告)日：2014-05-20

    申请号：US13558228

    申请日：2012-07-25

    申请人： Weijun Tan ,  Fan Zhang ,  Shaohua Yang

    发明人： Weijun Tan ,  Fan Zhang ,  Shaohua Yang

    IPC分类号： H03M13/00

    CPC分类号： G11B20/1889 ,  G11B20/10268

    摘要： Various embodiments of the present invention provide systems and methods for media defect detection. Data pre-processing is operable to pre-process a symbol based detected output to yield a suspect symbol indicator, and data detection is operable to provide a defect indicator corresponding to a probable defect identified based on the suspect symbol indicator.

    摘要翻译： 本发明的各种实施例提供了用于介质缺陷检测的系统和方法。 数据预处理可操作以预处理基于符号的检测输出以产生可疑符号指示符，并且数据检测可操作以提供对应于基于可疑符号指示符识别的可能缺陷的缺陷指示符。

    Systems and methods for recovering information from a defective medium
    5.
    发明授权
    Systems and methods for recovering information from a defective medium 有权
    从缺陷介质中恢复信息的系统和方法

    公开(公告)号：US08411537B2

    公开(公告)日：2013-04-02

    申请号：US12399750

    申请日：2009-03-06

    申请人： Weijun Tan ,  Kelly Fitzpatrick ,  Shaohua Yang

    发明人： Weijun Tan ,  Kelly Fitzpatrick ,  Shaohua Yang

    IPC分类号： G06F11/20

    CPC分类号： G11B20/1803 ,  G11B2220/2512 ,  H03M13/1105 ,  H03M13/2957 ,  H03M13/6343

    摘要： Various embodiments of the present invention provide systems and methods for data regeneration. For example, a system for regenerating data is disclosed. The system includes a media defect detector that is operable to identify a potential media defect associated with a medium from which an input signal is derived, an attenuation amplitude detector that generates an attenuation factor, and a data detector. The data detector includes a first data path and a second data path. The first data path includes a bank of two or more selectable noise prediction filters and the second data path includes a fixed noise prediction filter and the attenuation factor. The data detector processes a derivative of the input signal using the second data path when the potential media defect is indicated, and processes the derivative of the input signal using the first data path when a media defect is not indicated.

    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，公开了一种用于再生数据的系统。 该系统包括媒体缺陷检测器，其可操作以识别与从其导出输入信号的介质相关联的潜在介质缺陷，产生衰减因子的衰减幅度检测器和数据检测器。 数据检测器包括第一数据路径和第二数据路径。 第一数据路径包括一组两个或多个可选择的噪声预测滤波器，并且第二数据路径包括固定噪声预测滤波器和衰减因子。 当指示潜在介质缺陷时，数据检测器使用第二数据路径处理输入信号的导数，并且当没有指示介质缺陷时，使用第一数据路径处理输入信号的导数。

    Systems and Methods for Enhanced Media Defect Detection
    7.
    发明申请
    Systems and Methods for Enhanced Media Defect Detection 有权
    增强介质缺陷检测的系统和方法

    公开(公告)号：US20120254679A1

    公开(公告)日：2012-10-04

    申请号：US13495922

    申请日：2012-06-13

    申请人： Weijun Tan ,  Hongwei Song ,  Shaohua Yang

    发明人： Weijun Tan ,  Hongwei Song ,  Shaohua Yang

    IPC分类号： G11C29/08 ,  G06F11/26

    CPC分类号： G11B5/09 ,  G11B20/10009 ,  G11B20/10046 ,  G11B20/10055 ,  H03M13/3905

    摘要： Various embodiments of the present invention provide systems and methods for detecting storage medium defects. As one example, a media defect detection system is disclosed that includes a data detector circuit that applies a detection algorithm to the data input and provides a hard output and a soft output. A first circuit combines a first derivative of the hard output with a derivative of the data input to yield a first combined signal. A second circuit combines a second derivative of the hard output with a derivative of the first combined signal to yield a second combined signal. A third circuit combines a derivative of the soft output with the second combined signal and a threshold value to yield a defect signal.

    摘要翻译： 本发明的各种实施例提供了用于检测存储介质缺陷的系统和方法。 作为一个示例，公开了一种媒体缺陷检测系统，其包括将检测算法应用于数据输入并提供硬输出和软输出的数据检测器电路。 第一电路将硬输出的一阶导数与数据输入的导数组合以产生第一组合信号。 第二电路将硬输出的二阶导数与第一组合信号的导数组合以产生第二组合信号。 第三电路将软输出的导数与第二组合信号和阈值组合以产生缺陷信号。

    Programmable quasi-cyclic low-density parity check (QC LDPC) encoder for read channel
    8.
    发明授权
    Programmable quasi-cyclic low-density parity check (QC LDPC) encoder for read channel 有权
    用于读通道的可编程准循环低密度奇偶校验（QC LDPC）编码器

    公开(公告)号：US08281214B2

    公开(公告)日：2012-10-02

    申请号：US12288221

    申请日：2008-10-17

    申请人： Shaohua Yang ,  Changyou Xu ,  Richard Rauschmayer ,  Hao Zhong ,  Weijun Tan

    发明人： Shaohua Yang ,  Changyou Xu ,  Richard Rauschmayer ,  Hao Zhong ,  Weijun Tan

    IPC分类号： H03M13/00

    CPC分类号： H03M13/05 ,  G06F11/1008 ,  H03M13/116 ,  H03M13/2792

    摘要： The present invention is a programmable QC LDPC encoder for encoding user data. The encoder may be configurable for implementation with a read channel. The encoder may include a plurality of barrel shifter circuits. The barrel shifter circuits are configured for generating a plurality of parity bits based on interleaved user bits received by the encoder. The barrel shifter circuits are further configured for outputting the parity bits. The encoder may further include an encoder interleaver memory. The encoder interleaver memory may be communicatively coupled with the barrel shifter circuits and may receive the parity bits output from the barrel shifter circuits. The encoder interleaver may be configured for interleaving the parity bits. Further, the encoder may be configured for outputting the interleaved parity bits to a multiplexer. The barrel shifter circuits may generate the plurality of parity bits via an encoding algorithm: p=u*GT.

    摘要翻译： 本发明是用于编码用户数据的可编程QC LDPC编码器。 编码器可以被配置为用读通道实现。 编码器可以包括多个桶形移位器电路。 桶形移位器电路被配置为基于由编码器接收的交织的用户比特生成多个奇偶校验位。 桶形移位器电路还被配置为输出奇偶校验位。 编码器还可以包括编码器交织器存储器。 编码器交织器存储器可以与桶形移位器电路通信耦合，并且可以接收从桶形移位器电路输出的奇偶校验位。 编码器交织器可以被配置为交织奇偶校验位。 此外，编码器可以被配置为将交错的奇偶校验位输出到多路复用器。 桶形移位器电路可以通过编码算法生成多个奇偶校验位：p = u * GT。