公开(公告)号：US09837119B2

公开(公告)日：2017-12-05

申请号：US14949328

申请日：2015-11-23

Applicant: STMICROELECTRONICS, INC.

Inventor： Shayan Srinivasa Garani ,  Sivagnanam Parthasarathy

IPC: G11B27/36 ,  G11B20/18 ,  G06F11/20 ,  G11B20/10

CPC classification number: G11B20/1833 ,  G06F11/2094 ,  G06F2201/805 ,  G06F2201/85 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10064 ,  G11B20/10074 ,  G11B20/10222 ,  G11B20/10287 ,  G11B20/10296 ,  G11B20/10379 ,  G11B2020/1823 ,  G11B2020/1826 ,  G11B2020/185 ,  G11B2020/1863 ,  G11B2220/2516

Abstract: An embodiment of a data-read path includes a defect detector and a data-recovery circuit. The defect detector is operable to identify a defective region of a data-storage medium, and the data-recovery circuit is operable to recover data from the data-storage medium in response to the defect detector. For example, such an embodiment may allow identifying a defective region of a data-storage disk caused, e.g., by a scratch or contamination, and may allow recovering data that was written to the defective region.

公开(公告)号：US20140347762A1

公开(公告)日：2014-11-27

申请号：US14455816

申请日：2014-08-08

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Roy D. Cideciyan ,  Robert A. Hutchins ,  Thomas Mittelholzer ,  Sedat Oelcer

IPC: G11B20/18 ,  G11B5/008 ,  G11B20/10

CPC classification number: G11B20/1833 ,  G11B5/00813 ,  G11B20/10379 ,  G11B2020/185 ,  H03M5/145 ,  H03M13/1111 ,  H03M13/13 ,  H03M13/2957 ,  H03M13/3905 ,  H03M13/3972 ,  H03M13/6325

Abstract: In one embodiment, a tape drive system includes a soft detector having logic configured to execute a first forward loop of a detection algorithm on a first block of signal samples during a first time interval, execute a first reverse loop of the detection algorithm on the first block of signal samples during a second time interval, execute a second reverse loop of the detection algorithm on the first block of signal samples during a fifth time interval, and execute a second forward loop of the detection algorithm on the first block of signal samples during a fourth time interval using second soft information. Other tape drive systems and computer program products for decoding data are presented in more embodiments.

Abstract translation: 在一个实施例中，磁带驱动器系统包括软检测器，其具有被配置为在第一时间间隔内对第一信号样本块执行检测算法的第一正向循环的逻辑，在第一时间段执行检测算法的第一反向循环 在第二时间间隔内的信号采样块在第五时间间隔期间对第一信号样本块执行检测算法的第二反向循环，并且在第一信号样本块上执行检测算法的第二正向循环 使用第二软信息的第四时间间隔。 在更多实施例中呈现用于解码数据的其它磁带机系统和计算机程序产品。

公开(公告)号：US20140331108A1

公开(公告)日：2014-11-06

申请号：US13912109

申请日：2013-06-06

Applicant: LSI Corporation

Inventor： Dahua Qin ,  Xun Zhang ,  Haitao Xia

IPC: G06F11/07

CPC classification number: G06F11/0727 ,  G11B5/09 ,  G11B20/10305 ,  G11B20/10361 ,  G11B20/10379 ,  G11B20/1816 ,  H03M13/03 ,  H03M13/4107

Abstract: An apparatus for detecting media flaws includes a branch metric selection circuit operable to select a first branch metric and a second branch metric, a subtraction circuit operable to subtract the second branch metric from the first branch metric to yield a difference, and a comparator operable to compare the difference with a threshold value and to indicate a presence of a potential flaw in a storage medium when the difference is less than the threshold value.

Abstract translation: 用于检测媒体缺陷的装置包括可操作以选择第一分支度量和第二分支度量的分支度量选择电路，减法电路，用于从第一分支度量中减去第二分支度量以产生差值;以及比较器， 将差值与阈值进行比较，并且当差值小于阈值时指示存储介质中存在潜在缺陷。

公开(公告)号：US08611411B2

公开(公告)日：2013-12-17

申请号：US13256608

申请日：2010-03-18

Applicant: Atsushi Hayami ,  Makoto Itonaga

Inventor： Atsushi Hayami ,  Makoto Itonaga

IPC: H03H7/30

CPC classification number: G11B20/10009 ,  G11B20/10046 ,  G11B20/1012 ,  G11B20/10222 ,  G11B20/10296 ,  G11B20/10379 ,  G11B20/10462 ,  G11B2220/2537

Abstract: A linear equalizer unit sequentially subjects a signal to be processed to linear equalization. A temporary decision unit sequentially subjects a signal subjected to linear equalization by the linear equalizer unit to temporary decision. A nonlinear equalizer unit derives a plurality of coefficients using a signal subjected to temporary decision as a teacher signal and sequentially subject a signal subjected to linear equalization by the linear equalizer unit to nonlinear equalization based on the plurality of coefficients.

Abstract translation: 线性均衡器单元将待处理的信号顺序地进行线性均衡。 临时判断单元将线性均衡器进行线性均衡的信号顺序地进行临时决定。 非线性均衡器单元使用经过临时判定的信号作为教师信号来导出多个系数，并且基于多个系数将由线性均衡器单元进行线性均衡的信号顺序地进行非线性均衡。

公开(公告)号：US08433965B2

公开(公告)日：2013-04-30

申请号：US12880740

申请日：2010-09-13

Applicant: Marc Feller

Inventor： Marc Feller

IPC: G06F11/00 ,  H03M13/00

CPC classification number: G11B20/10009 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10222 ,  G11B20/10231 ,  G11B20/10379 ,  G11B2220/20 ,  G11B2220/90 ,  H03M13/39 ,  H03M13/41

Abstract: A digital data recovery system for converting a suboptimal signal into a converted signal that closely approximates an original signal includes a first data filter, a first interpolator and a second interpolator. The first data filter filters the suboptimal signal to generate a first filtered signal. The first interpolator receives the first filtered signal and generates a first interpolated signal. Substantially concurrently, the second interpolator receives the suboptimal signal and generates a second interpolated signal. The digital data recovery system may further comprise a second data filter that receives the second interpolated signal and generates a second filtered signal. Further, the first data filter can include a set of first coefficients and the second data filter can include a set of second coefficients. Moreover, the second coefficients can be updated and subsequently transformed in order to update the first coefficients.

Abstract translation: 用于将次最佳信号转换为接近原始信号的转换信号的数字数据恢复系统包括第一数据滤波器，第一内插器和第二内插器。 第一数据滤波器滤除次优信号以产生第一滤波信号。 第一内插器接收第一滤波信号并产生第一内插信号。 基本同时，第二内插器接收次优信号并产生第二内插信号。 数字数据恢复系统还可以包括接收第二内插信号并产生第二滤波信号的第二数据滤波器。 此外，第一数据滤波器可以包括一组第一系数，并且第二数据滤波器可以包括一组第二系数。 此外，可以更新第二系数并随后变换以更新第一系数。

公开(公告)号：US08139301B1

公开(公告)日：2012-03-20

申请号：US12507294

申请日：2009-07-22

Applicant: Shaoping Li ,  Yimin Guo ,  Francis H. Liu ,  Sining Mao

Inventor： Shaoping Li ,  Yimin Guo ,  Francis H. Liu ,  Sining Mao

IPC: G11B5/09 ,  G11B20/10

CPC classification number: G11B5/3954 ,  G11B5/012 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10074 ,  G11B20/10175 ,  G11B20/10222 ,  G11B20/10231 ,  G11B20/10277 ,  G11B20/10305 ,  G11B20/10314 ,  G11B20/10379 ,  G11B20/1258 ,  G11B2220/2516

Abstract: A disk drive is disclosed comprising a disk having a plurality of data tracks, and a head actuated over the disk, the head comprising a first read element and a second read element. A data track is read to generate a first read signal emanating from the first read element and a second read signal emanating from the second read element. The first read signal is delayed relative to the second read signal to generate a delayed read signal, and the second read signal is combined with the delayed read signal to generate a combined read signal. An estimated data sequence is detected from the combined read signal.

Abstract translation: 公开了一种磁盘驱动器，其包括具有多个数据磁道的磁盘，以及在盘上驱动的磁头，磁头包括第一读取元件和第二读取元件。 读取数据磁道以产生从第一读取元件发出的第一读取信号和从第二读取元件发出的第二读取信号。 第一读取信号相对于第二读取信号被延迟以产生延迟的读取信号，并且第二读取信号与延迟的读取信号组合以产生组合的读取信号。 从组合的读取信号中检测估计的数据序列。

公开(公告)号：US20120066561A1

公开(公告)日：2012-03-15

申请号：US12880740

申请日：2010-09-13

Applicant: MARC FELLER

Inventor： MARC FELLER

IPC: H03M13/00 ,  G06F11/07

CPC classification number: G11B20/10009 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10222 ,  G11B20/10231 ,  G11B20/10379 ,  G11B2220/20 ,  G11B2220/90 ,  H03M13/39 ,  H03M13/41

Abstract: A digital data recovery system (14) for converting a suboptimal signal (18) into a converted signal (20) that closely approximates an original signal (16) includes a first data filter (22), a first interpolator (26) and a second interpolator (36). The first data filter (22) filters the suboptimal signal (18) to generate a first filtered signal (48). The first interpolator (26) receives the first filtered signal (48) and generates a first interpolated signal (52). Substantially concurrently, the second interpolator (36) receives the suboptimal signal (18) and generates a second interpolated signal (64). The digital data recovery system (14) may further comprise a second data filter (38) that receives the second interpolated signal (64) and generates a second filtered signal (66). Further, the first data filter (22) can include a set of first coefficients (50) and the second data filter (38) can include a set of second coefficients (68). Moreover, the second coefficients (68) can be updated and subsequently transformed in order to update the first coefficients (50).

Abstract translation: 用于将次最佳信号（18）转换为紧密接近原始信号（16）的转换信号（20）的数字数据恢复系统（14）包括第一数据滤波器（22），第一内插器（26）和第二数字滤波器 内插器（36）。 第一数据滤波器（22）对次优信号（18）进行滤波以产生第一滤波信号（48）。 第一内插器（26）接收第一滤波信号（48）并产生第一内插信号（52）。 基本上同时地，第二内插器（36）接收次优信号（18）并产生第二内插信号（64）。 数字数据恢复系统（14）还可以包括接收第二内插信号（64）并产生第二滤波信号（66）的第二数据滤波器（38）。 此外，第一数据滤波器（22）可以包括一组第一系数（50），并且第二数据滤波器（38）可以包括一组第二系数（68）。 此外，可以更新第二系数（68）并随后变换以更新第一系数（50）。

公开(公告)号：US20110246864A1

公开(公告)日：2011-10-06

申请号：US12750350

申请日：2010-03-30

Applicant: Evangelos S. Eleftheriou ,  Robert A. Hutchins ,  Sedat Oelcer

Inventor： Evangelos S. Eleftheriou ,  Robert A. Hutchins ,  Sedat Oelcer

IPC: G06F11/07

CPC classification number: G11B20/10009 ,  G11B20/10046 ,  G11B20/10379 ,  G11B20/10509 ,  G11B2220/2516

Abstract: According to one embodiment, a data detection system includes a coefficient-and-variance engine for selecting which infinite impulse response (IIR) filter and prediction error variance to process and store at any time, and a maximum-likelihood sequence detector. The coefficient-and-variance engine comprises a filter bank storing a plurality of IIR filters that represent a plurality of data-dependent noise whitening or noise prediction filters; a least-mean square (LMS) engine for adapting each IIR filter to actual noise conditions: a variance hank storing a plurality of prediction error variance values; and a data-dependent prediction error variance computation unit which updates the plurality of prediction error variance values. The maximum-likelihood sequence detector includes a metric computation unit that employs the plurality of IIR filters in the filter bank and the plurality of prediction error variances in the variance bank to adaptively compute detector branch metrics. Other systems and methods are also described in other embodiments.

Abstract translation: 根据一个实施例，数据检测系统包括用于选择在任何时间处理和存储的无限脉冲响应（IIR）滤波器和预测误差方差的系数和方差引擎和最大似然序列检测器。 系数和方差引擎包括存储多个表示多个数据相关噪声白化或噪声预测滤波器的IIR滤波器的滤波器组; 用于使每个IIR滤波器适应于实际噪声条件的最小均方（LMS）引擎：存储多个预测误差方差值的方差汉克; 以及数据相关预测误差方差计算单元，其更新所述多个预测误差方差值。 最大似然序列检测器包括在滤波器组中采用多个IIR滤波器的度量计算单元，并且方差库中的多个预测误差方差自适应地计算检测器分支度量。 其他系统和方法也在其他实施例中描述。

公开(公告)号：US20090207705A1

公开(公告)日：2009-08-20

申请号：US12369870

申请日：2009-02-12

Applicant: Shigeru FURUMIYA ,  Atsushi NAKAMURA

Inventor： Shigeru FURUMIYA ,  Atsushi NAKAMURA

IPC: G11B20/10

CPC classification number: G11B7/00458 ,  G11B7/00736 ,  G11B7/268 ,  G11B20/10009 ,  G11B20/10314 ,  G11B20/10379 ,  G11B2020/1099 ,  G11B2220/218 ,  G11B2220/2541

Abstract: An optical disc verification method according to the present invention includes the steps of: writing data on first, second and third radial locations on an optical disc at a writing speed V1 and reading the data written there, thereby measuring read signal quality index values A, B and C, where the second radial location is inside of the first radial location and the third radial location is inside of the second radial location; writing data on the first and second radial locations at a writing speed V2, which is higher than V1, and reading the data written there, thereby measuring read signal quality index values D and E; and correcting the signal quality index value C with the difference between the signal quality index values B and E, thereby calculating a signal quality index value F that would be obtained if data is written on, and then read from, the third radial location at the speed V2.

Abstract translation: 根据本发明的光盘验证方法包括以下步骤：以写入速度V1在光盘上的第一，第二和第三径向位置上写入数据，并读取写在其上的数据，从而测量读取信号质量指数值A， B和C，其中第二径向位置在第一径向位置内，第三径向位置在第二径向位置内; 以高于V1的写入速度V2在第一和第二径向位置上写入数据，并读取写入的数据，从而测量读取信号质量指标值D和E; 并且用信号质量指标值B和E之间的差校正信号质量指标值C，由此计算如果数据被写入的第三径向位置上的数据被读取，然后读取，则获得的信号质量指标值F 速度V2。

公开(公告)号：US20050204255A1

公开(公告)日：2005-09-15

申请号：US10799231

申请日：2004-03-12

Applicant: Nan-Hsiung Yeh ,  Yan Li

Inventor： Nan-Hsiung Yeh ,  Yan Li

IPC: H03M13/00

CPC classification number: H03M13/6343 ,  G11B20/10379 ,  G11B20/1833 ,  G11B20/1866 ,  G11B2020/1843 ,  G11B2020/1853 ,  G11B2020/1856 ,  G11B2020/1863 ,  G11B2220/2516 ,  H03M13/098 ,  H03M13/2963 ,  H03M13/2975 ,  H03M13/3994 ,  H03M13/4138 ,  H03M13/6325

Abstract: A method of decoding a turbo product code (TPC) code word comprises performing a cyclic redundancy check (CRC) on each of a plurality of code blocks of the TPC code word. The bits of code blocks of the TPC code word which pass the CRC are assigned an artificially high probability confidence measure, such as an artificially high log-likelihood ratio. Assigning these bits an artificially high probability confidence measure allows an iterative process, between a soft decision algorithm and a TPC decoder, to be less complex and to converge on a correct decoding solution more quickly. Apparatus for implementing the method are also provided.

Abstract translation: 解码涡轮乘积码（TPC）码字的方法包括在TPC码字的多个码块中的每一个上执行循环冗余校验（CRC）。 通过CRC的TPC码字的码块的比特被分配人为高概率置信度量度，例如人为高的对数似然比。 将这些比特分配给人为高概率置信度测量允许在软判决算法和TPC解码器之间的迭代过程不太复杂并且更快地收敛于正确的解码解决方案。 还提供了用于实现该方法的装置。