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    System for reproducing data with increased accuracy by reducing difference between sampled and expected values
    1.
    发明授权
    System for reproducing data with increased accuracy by reducing difference between sampled and expected values 失效
    通过减少采样值和预期值之间的差异，以更高的精度再现数据的系统

    公开(公告)号：US06603722B1

    公开(公告)日：2003-08-05

    申请号：US09694066

    申请日：2000-10-19

    申请人： Masakazu Taguchi ,  Satoshi Furuta ,  Toru Fujiwara

    发明人： Masakazu Taguchi ,  Satoshi Furuta ,  Toru Fujiwara

    IPC分类号： G11B576

    CPC分类号： G11B20/10101 ,  G11B5/012 ,  G11B11/10515 ,  G11B20/10009 ,  G11B20/10111 ,  G11B20/10296 ,  G11B20/1833

    摘要： A data reproduction system, which determines reproduced data based on comparison results of path metrics calculated in accordance with a Viterbi algorithm based on branch metrics calculated from expected values and a sampled value of a readout signal, includes an expected value setting unit for variably setting the expected values used for a calculation of the branch metrics in order to perform a Viterbi detection process without being easily affected by the transient response, offset variation, phase error and nonlinear torsion component of the readout signal. The readout signal is obtained from a recording medium on which data is recorded in accordance with a recording signal of a partial response waveform, the expected values are determined by the partial response waveform, and the sampled value is obtained by sampling the readout signal at a predetermined frequency.

    摘要翻译： 一种数据再现系统，其基于基于由预期值计算的分支度量和读出信号的采样值，基于根据维特比算法计算的路径度量的比较结果确定再现数据，包括预期值设置单元，用于可变地设置 用于计算分支度量的期望值，以执行维特比检测处理，而不会容易地受到读出信号的瞬态响应，偏移变化，相位误差和非线性扭转分量的影响。 从根据部分响应波形的记录信号记录数据的记录介质获得读出信号，期望值由部分响应波形确定，并且采样值通过在 预定频率。

    Clock matching apparatus for a data reproduction system
    2.
    发明授权
    Clock matching apparatus for a data reproduction system 失效
    用于数据再现系统的时钟匹配装置

    公开(公告)号：US6151282A

    公开(公告)日：2000-11-21

    申请号：US409538

    申请日：1999-09-30

    申请人： Kenichi Hamada ,  Satoshi Furuta ,  Masakazu Taguchi ,  Toru Fujiwara

    发明人： Kenichi Hamada ,  Satoshi Furuta ,  Masakazu Taguchi ,  Toru Fujiwara

    IPC分类号： G11B20/14 ,  G11B5/09 ,  G11B7/00 ,  G11B7/005 ,  G11B11/10 ,  G11B20/10

    CPC分类号： G11B20/10009 ,  G11B20/10296

    摘要： A clock matching apparatus for a data reproduction system includes a phase error detection unit which detects a phase error of a clock signal based on samples of a readout signal output by a sampler of the data reconstruction system. A phase-locked loop supplies a phase-matched clock signal to the sampler by compensating for the phase error detected by the phase error detection unit. The phase error detection unit includes an edge detection unit which detects a sampling instant for an edge sample among the samples of the readout signal. A difference unit generates a difference in timing phase between the edge sample and a sync level, the sync level being a reference signal level corresponding to a level of the readout signal at the sampling instants thereof and defined based on a partial-response waveform, the difference in the timing phase being output to the phase-locked loop as the detected phase error.

    摘要翻译： 用于数据再现系统的时钟匹配装置包括相位误差检测单元，其基于由数据重建系统的采样器输出的读出信号的样本来检测时钟信号的相位误差。 锁相环通过补偿由相位误差检测单元检测到的相位误差向采样器提供相位匹配的时钟信号。 相位误差检测单元包括边缘检测单元，其检测读出信号的样本中的边缘样本的采样时刻。 差分单元产生边缘样本和同步电平之间的定时相位差，同步电平是与其采样时刻的读出信号的电平相对应的参考信号电平，并且基于部分响应波形定义 作为检测到的相位误差，定时相位的差异被输出到锁相环。

    Data reproduction control method and apparatus, and optical disk unit
    3.
    发明授权
    Data reproduction control method and apparatus, and optical disk unit 失效
    数据再现控制方法和装置以及光盘单元

    公开(公告)号：US06775219B2

    公开(公告)日：2004-08-10

    申请号：US10457758

    申请日：2003-06-09

    申请人： Toru Fujiwara ,  Akira Nanba ,  Masakazu Taguchi

    发明人： Toru Fujiwara ,  Akira Nanba ,  Masakazu Taguchi

    IPC分类号： G11B509

    CPC分类号： G11B20/10212 ,  G11B20/10009 ,  G11B20/10046 ,  G11B20/10101 ,  G11B20/10481 ,  H03M13/41 ,  H03M13/6331 ,  H03M13/6343 ,  H03M13/6502 ,  H03M13/6577 ,  H04L25/062 ,  H04L25/069

    摘要： The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control method and apparatus, and an optical disk unit that adjust sampled values, in sampling a signal reproduced from a recording medium recorded with data, the frequencies of the levels of quantized data are counted, a histogram of the frequencies of the levels is created based on the counting results, and more accurate reproduced data is obtained by means of a distribution of the frequencies of the levels in the histogram.

    摘要翻译： 即使再现信号由于噪声而局部变化或包括稳定的失真，本发明实现了稳定和更合适的数据再现。 在数据再现控制方法和装置以及调整采样值的光盘单元中，对从记录有数据的记录介质再现的信号进行采样时，对量化数据的电平的频率进行计数， 基于计数结果创建电平，并且通过直方图中电平的频率的分布获得更准确的再现数据。

    Data defect detection using soft decision result
    4.
    发明申请
    Data defect detection using soft decision result 失效
    使用软判决结果进行数据缺陷检测

    公开(公告)号：US20070192653A1

    公开(公告)日：2007-08-16

    申请号：US11783872

    申请日：2007-04-12

    申请人： Toru Fujiwara ,  Masakazu Taguchi

    发明人： Toru Fujiwara ,  Masakazu Taguchi

    IPC分类号： G06F11/00

    CPC分类号： G11B20/1816 ,  G11B7/005 ,  G11B20/10055 ,  G11B20/10287 ,  G11B20/10296 ,  G11B2020/1859 ,  G11B2020/1863 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/6331

    摘要： A defect detection device, apparatus, and method for detecting a defect of data recorded on a recording medium. The defect detection device includes a waveform state detection part generating information representing a state of a waveform of a reproduced signal from the recording medium based on soft decision results obtained in a process of reproducing the data in accordance with a maximum likelihood decoding algorithm corresponding to a partial response. The defect detection device includes a defect determination part determining the defect of the recorded data based on the information generated in the waveform state detection part.

    摘要翻译： 一种用于检测记录在记录介质上的数据缺陷的缺陷检测装置，装置和方法。 所述缺陷检测装置包括：波形状态检测部，根据在与所述记录媒体对应的最大似然解码算法的再生处理中得到的软判定结果，生成表示来自所述记录媒体的再现信号的波形的信息的信息 部分反应。 缺陷检测装置包括基于在波形状态检测部中生成的信息来确定记录数据的缺陷的缺陷确定部。

    Data defect detection using soft decision result
    5.
    发明授权
    Data defect detection using soft decision result 失效
    使用软判决结果进行数据缺陷检测

    公开(公告)号：US07257066B2

    公开(公告)日：2007-08-14

    申请号：US09956080

    申请日：2001-09-20

    申请人： Toru Fujiwara ,  Masakazu Taguchi

    发明人： Toru Fujiwara ,  Masakazu Taguchi

    IPC分类号： G11B7/005

    CPC分类号： G11B20/1816 ,  G11B7/005 ,  G11B20/10055 ,  G11B20/10287 ,  G11B20/10296 ,  G11B2020/1859 ,  G11B2020/1863 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/6331

    摘要： A defect detection device for detecting a defect of data recorded on a recording medium includes a waveform state detection part generating information representing a state of a waveform of a reproduced signal from the recording medium based on soft decision results obtained in process of reproducing the data in accordance with a maximum likelihood decoding algorithm corresponding to partial response, and a defect determination part determining the defect of the recorded data based on the information generated in said waveform state detection part.

    摘要翻译： 用于检测记录在记录介质上的数据的缺陷的缺陷检测装置包括：波形状态检测部分，根据在再现数据的处理过程中获得的软判决结果，生成表示来自记录介质的再现信号的波形状态的信息; 根据对应于部分响应的最大似然解码算法，以及缺陷确定部分，基于在所述波形状态检测部分中生成的信息来确定记录数据的缺陷。

    Data defect detection using soft decision result
    6.
    发明授权
    Data defect detection using soft decision result 失效
    使用软判决结果进行数据缺陷检测

    公开(公告)号：US07573794B2

    公开(公告)日：2009-08-11

    申请号：US11783872

    申请日：2007-04-12

    申请人： Toru Fujiwara ,  Masakazu Taguchi

    发明人： Toru Fujiwara ,  Masakazu Taguchi

    IPC分类号： G11B7/005

    CPC分类号： G11B20/1816 ,  G11B7/005 ,  G11B20/10055 ,  G11B20/10287 ,  G11B20/10296 ,  G11B2020/1859 ,  G11B2020/1863 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/6331

    摘要： A defect detection device, apparatus, and method for detecting a defect of data recorded on a recording medium. The defect detection device includes a waveform state detection part generating information representing a state of a waveform of a reproduced signal from the recording medium based on soft decision results obtained in a process of reproducing the data in accordance with a maximum likelihood decoding algorithm corresponding to a partial response. The defect detection device includes a defect determination part determining the defect of the recorded data based on the information generated in the waveform state detection part.

    摘要翻译： 一种用于检测记录在记录介质上的数据缺陷的缺陷检测装置，装置和方法。 所述缺陷检测装置包括：波形状态检测部，根据在与所述记录媒体对应的最大似然解码算法的再生处理中得到的软判定结果，生成表示来自所述记录媒体的再现信号的波形的信息的信息 部分反应。 缺陷检测装置包括基于在波形状态检测部中生成的信息来确定记录数据的缺陷的缺陷确定部。

    Data reproducing method and device reproducing data according to a Viterbi decoding algorithm using an average value of a reproduction signal
    8.
    发明授权
    Data reproducing method and device reproducing data according to a Viterbi decoding algorithm using an average value of a reproduction signal 失效
    数据再现方法和装置根据使用再现信号的平均值的维特比解码算法再现数据

    公开(公告)号：US07076006B2

    公开(公告)日：2006-07-11

    申请号：US09901981

    申请日：2001-07-10

    申请人： Toru Fujiwara ,  Masakazu Taguchi

    发明人： Toru Fujiwara ,  Masakazu Taguchi

    IPC分类号： H03D1/00

    CPC分类号： H03M13/6331 ,  G11B20/10009 ,  H03M13/4107 ,  H03M13/6343 ,  H03M13/6502

    摘要： A data reproducing method reproduces data corresponding to a state-transition pass selected as being most likely according to a Viterbi decoding algorithm from a reproduction signal supplied from a recording medium. The data reproducing method comprises the steps of detecting at least one state of the reproduction signal according to data used for selecting the state-transition pass, calculating an average value of the reproduction signal in the state detected by the step of detecting, and following a fluctuation amount of a direct current component of the reproduction signal according to the average value.

    摘要翻译： 数据再现方法根据从记录介质提供的再现信号中再现根据维特比解码算法最有可能选择的状态转换通道的数据。 数据再现方法包括以下步骤：根据用于选择状态转换通道的数据检测再现信号的至少一个状态，计算在通过检测步骤检测到的状态下的再现信号的平均值，并遵循一个 根据平均值的再现信号的直流分量的变动量。

    Data reproduction method and apparatus
    9.
    发明授权
    Data reproduction method and apparatus 失效
    数据再生方法及装置

    公开(公告)号：US07002889B2

    公开(公告)日：2006-02-21

    申请号：US09764009

    申请日：2001-01-17

    申请人： Masakazu Taguchi ,  Toru Fujiwara

    发明人： Masakazu Taguchi ,  Toru Fujiwara

    IPC分类号： G11B7/00 ,  G11B5/76

    CPC分类号： G11B20/10148 ,  G11B20/10009 ,  G11B20/10083 ,  G11B20/10111 ,  G11B20/1426

    摘要： In a data reproduction method and apparatus of the present invention, a Viterbi detection unit is provided, the Viterbi detection unit having a plurality of detectors each providing a first partial response signal with a first constraint length from a first sequence of samples derived from a first readout signal. One of connection and disconnection of the plurality of detectors in the Viterbi detection unit is selected in response to a timing signal, wherein, when the connection of the plurality of detectors is selected, the Viterbi detection unit provides a second partial response signal with a second constraint length from a second sequence of samples derived from a second readout signal, the second constraint length being different from the first constraint length.

    摘要翻译： 在本发明的数据再现方法和装置中，提供维特比检测单元，维特比检测单元具有多个检测器，每个检测器提供第一部分响应信号，该第一部分响应信号具有来自第一 读出信号。 响应于定时信号选择维特比检测单元中的多个检测器的连接和断开之一，其中当选择多个检测器的连接时，维特比检测单元提供具有第二部分响应信号的第二部分响应信号 从第二读出信号导出的第二样本序列的约束长度，第二约束长度不同于第一约束长度。