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    Data reproduction control method and apparatus, and optical disk unit
    1.
    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 reproduction device with simplified circuit structure
    6.
    发明授权
    Data reproduction device with simplified circuit structure 失效
    具有简化电路结构的数据再现装置

    公开(公告)号：US06680684B2

    公开(公告)日：2004-01-20

    申请号：US10331552

    申请日：2002-12-31

    申请人： Akira Nanba ,  Kenichi Hamada ,  Masakazu Taguchi

    发明人： Akira Nanba ,  Kenichi Hamada ,  Masakazu Taguchi

    IPC分类号： H03M112

    CPC分类号： G11B20/1403 ,  G11B20/10009

    摘要： A data reproduction device includes an A/D converter quantizing a reproduction signal read from data recorded on a recording medium to produce quantized data based on a sampling clock; a reproduction signal determination unit determining rising and falling parts of the reproduction signal based on the quantized data, and outputting a gate signal corresponding to a result of determining the rising and falling parts; a leading-edge clock generation unit generating a leading-edge clock signal synchronous to a leading edge indicating a rising part of the reproduction signal; a trailing-edge clock generation unit generating a trailing-edge clock signal synchronous to a trailing edge indicating a falling part of the reproduction signal; a signal switch unit generating the sampling clock by selecting one of the leading-edge clock signal and the trailing-edge clock signal based on a value of the gate signal; and a signal supply unit supplying the sampling clock to the A/D converter, wherein the data reproduction device reproduces the data recorded on the recording medium by executing digital signal processing on the quantized data. The data reproduction device can share a single A/D converter and a single decoder used for reproducing recorded data based on clocks synchronous to a leading edge and a trailing edge of the recording pit. As a result, a circuit structure of the data reproduction device is simplified, thereby achieving decreases in a size of an implementation area and in the number of implemented parts in the circuit structure of the data reproduction device.

    摘要翻译： 数据再现装置包括：量化从记录在记录介质上的数据读取的再现信号的A / D转换器，以产生基于采样时钟的量化数据; 再现信号确定单元，基于量化数据确定再现信号的上升和下降部分，并输出与确定上升和下降部分的结果相对应的门信号; 前沿时钟产生单元，产生与指示再现信号的上升部分的前沿同步的前沿时钟信号; 一个后沿时钟产生单元，产生与指示再现信号的下降部分的后沿同步的后沿时钟信号; 信号切换单元，基于所述门信号的值，选择所述前沿时钟信号和所述后沿时钟信号之一，生成所述采样时钟; 以及将采样时钟提供给A / D转换器的信号供给单元，其中数据再现装置通过对量化数据执行数字信号处理来再现记录在记录介质上的数据。 数据再现装置可以基于与记录凹坑的前沿和后沿同步的时钟来共享单个A / D转换器和用于再现记录数据的单个解码器。 结果，简化了数据再现装置的电路结构，从而实现了数据再现装置的电路结构中的实现区域的大小和实现部分的数量的减少。

    Data reproduction device with simplified circuit structure
    7.
    发明授权
    Data reproduction device with simplified circuit structure 失效
    具有简化电路结构的数据再现装置

    公开(公告)号：US06603419B2

    公开(公告)日：2003-08-05

    申请号：US09774100

    申请日：2001-01-31

    申请人： Akira Nanba ,  Kenichi Hamada ,  Masakazu Taguchi

    发明人： Akira Nanba ,  Kenichi Hamada ,  Masakazu Taguchi

    IPC分类号： H03M112

    CPC分类号： G11B20/1403 ,  G11B20/10009

    摘要： A data reproduction device reproduces the data recorded on the recording medium by executing digital signal processing on the quantized data. The data reproduction device can share a single A/D converter and a single decoder used for reproducing recorded data based on clocks synchronous to a leading edge and a trailing edge of the recording pit.

    摘要翻译： 数据再现装置通过对量化数据执行数字信号处理来再现记录在记录介质上的数据。 数据再现装置可以基于与记录凹坑的前沿和后沿同步的时钟来共享单个A / D转换器和用于再现记录数据的单个解码器。

    Data defect detection using soft decision result
    8.
    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 reproducing method and device reproducing data according to a Viterbi decoding algorithm using an average value of a reproduction signal
    9.
    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
    10.
    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。