Amplitude-based approach for detection and classification of hard-disc defect regions
    1.
    发明授权
    Amplitude-based approach for detection and classification of hard-disc defect regions 失效
    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

    IPC分类号: G11B27/36 G11B5/02

    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。

    AMPLITUDE-BASED APPROACH FOR DETECTION AND CLASSIFICATION OF HARD-DISC DEFECT REGIONS
    2.
    发明申请
    AMPLITUDE-BASED APPROACH FOR DETECTION AND CLASSIFICATION OF HARD-DISC DEFECT REGIONS 失效
    用于检测和分类硬盘区缺陷区域的基于幅度的方法

    公开(公告)号:US20110235490A1

    公开(公告)日:2011-09-29

    申请号:US12729312

    申请日:2010-03-23

    IPC分类号: G11B27/36

    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., ∝1) 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., ∝2) 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) 一个或两个信号值和预期信号值。 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。

    FREQUENCY-BASED APPROACH FOR DETECTION AND CLASSIFICATION OF HARD-DISC DEFECT REGIONS
    3.
    发明申请
    FREQUENCY-BASED APPROACH FOR DETECTION AND CLASSIFICATION OF HARD-DISC DEFECT REGIONS 有权
    基于频率的硬盘区缺陷检测和分类方法

    公开(公告)号:US20110199699A1

    公开(公告)日:2011-08-18

    申请号:US12707820

    申请日:2010-02-18

    IPC分类号: G11B27/36

    摘要: In a hard-disc drive read channel, frequency-based measures are generated at two different data frequencies (e.g., 2T and DC) by applying a transform, such as a discrete Fourier transform (DFT), to signal values, such as ADC or equalizer output values, corresponding to, e.g., a 2T data pattern stored on the hard disc. The frequency-based measures are used to detect defect regions on the hard disc and/or to classify defect regions as being due to either thermal asperity (TA) or drop-out media defect (MD).

    摘要翻译: 在硬盘驱动读取通道中,通过将诸如离散付里叶变换(DFT)之类的变换应用于信号值(例如ADC或ADC),以两个不同的数据频率(例如,2T和DC)生成基于频率的测量 均衡器输出值,对应于例如存储在硬盘上的2T数据模式。 基于频率的测量用于检测硬盘上的缺陷区域和/或将缺陷区域分类为由于热粗糙度(TA)或脱落介质缺陷(MD)引起的。

    Frequency-based approach for detection and classification of hard-disc defect regions
    4.
    发明授权
    Frequency-based approach for detection and classification of hard-disc defect regions 有权
    基于频率的硬盘缺陷区域检测和分类方法

    公开(公告)号:US08031420B2

    公开(公告)日:2011-10-04

    申请号:US12707820

    申请日:2010-02-18

    IPC分类号: G11B27/36 G11B5/02

    摘要: In a hard-disc drive read channel, frequency-based measures are generated at two different data frequencies (e.g., 2T and DC) by applying a transform, such as a discrete Fourier transform (DFT), to signal values, such as ADC or equalizer output values, corresponding to, e.g., a 2T data pattern stored on the hard disc. The frequency-based measures are used to detect defect regions on the hard disc and/or to classify defect regions as being due to either thermal asperity (TA) or drop-out media defect (MD).

    摘要翻译: 在硬盘驱动读取通道中,通过将诸如离散付里叶变换(DFT)之类的变换应用于信号值(例如ADC或ADC),以两个不同的数据频率(例如,2T和DC)生成基于频率的测量 均衡器输出值,对应于例如存储在硬盘上的2T数据模式。 基于频率的测量用于检测硬盘上的缺陷区域和/或将缺陷区域分类为由于热粗糙度(TA)或脱落介质缺陷(MD)引起的。

    Systems and methods for utilizing circulant parity in a data processing system
    5.
    发明授权
    Systems and methods for utilizing circulant parity in a data processing system 有权
    在数据处理系统中利用循环奇偶校验的系统和方法

    公开(公告)号:US08458553B2

    公开(公告)日:2013-06-04

    申请号:US12510885

    申请日:2009-07-28

    IPC分类号: H03M13/00

    摘要: Various embodiments of the present invention provide systems and methods for data processing. For example, a method for data processing is disclosed that includes receiving a codeword that has at least a first circulant with a plurality of data bits and a first circulant parity bit, a second circulant with a plurality of data bits and a second circulant parity bit, and one or more codeword parity bits. The methods further include decoding the codeword using the one or more codeword parity bits to access the first circulant and the second circulant, performing a first circulant parity check on the first circulant, and performing a second circulant parity check on the second circulant.

    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,公开了一种用于数据处理的方法,其包括:接收具有至少第一循环的码字,其具有多个数据位和第一循环奇偶校验位,第二循环具有多个数据位和第二循环奇偶校验位 ,以及一个或多个码字奇偶校验位。 所述方法还包括使用所述一个或多个码字奇偶校验比特来解码所述码字,以访问所述第一循环和所述第二循环,对所述第一循环执行第一循环奇偶校验,以及对所述第二循环执行第二循环奇偶校验。

    Turbo-equalization methods for iterative decoders
    9.
    发明授权
    Turbo-equalization methods for iterative decoders 有权
    用于迭代解码器的Turbo均衡方法

    公开(公告)号:US08291299B2

    公开(公告)日:2012-10-16

    申请号:US12524418

    申请日:2009-04-02

    IPC分类号: H03M13/00

    摘要: Certain embodiments of the present invention are improved turbo-equalization methods for decoding encoded codewords. In one embodiment, in global decoding iteration i, the magnitude values of all decoder-input LLR values (Lch) are adjusted based on the number b of unsatisfied check nodes in the decoded codeword produced by global iteration i−1. The improved turbo-equalization methods can be used as the sole turbo-equalization method for a given global decoding session, or interleaved with other turbo-equalization methods.

    摘要翻译: 本发明的某些实施例是用于解码编码码字的改进的turbo均衡方法。 在一个实施例中,在全局解码迭代i中,基于由全局迭代i-1产生的解码码字中的不满足的校验节点的数量b来调整所有解码器输入的LLR值(Lch)的幅度值。 改进的turbo均衡方法可以用作给定全局解码会话的唯一turbo均衡方法,或者与其他turbo均衡方法交织。

    Turbo-Equalization Methods For Iterative Decoders
    10.
    发明申请
    Turbo-Equalization Methods For Iterative Decoders 有权
    用于迭代解码器的涡轮均衡方法

    公开(公告)号:US20110311002A1

    公开(公告)日:2011-12-22

    申请号:US12524418

    申请日:2009-04-02

    IPC分类号: H04L27/06

    摘要: Certain embodiments of the present invention are improved turbo-equalization methods for decoding encoded codewords. In one embodiment, in global decoding iteration i, the magnitude values of all decoder-input LLR values (Lch) are adjusted based on the number b of unsatisfied check nodes in the decoded codeword produced by global iteration i−1. The improved turbo-equalization methods can be used as the sole turbo-equalization method for a given global decoding session, or interleaved with other turbo-equalization methods.

    摘要翻译: 本发明的某些实施例是用于解码编码码字的改进的turbo均衡方法。 在一个实施例中,在全局解码迭代i中,基于由全局迭代i-1产生的解码码字中的不满足的校验节点的数量b来调整所有解码器输入的LLR值(Lch)的幅度值。 改进的turbo均衡方法可以用作给定全局解码会话的唯一turbo均衡方法,或者与其他turbo均衡方法交织。