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    Signal evaluation method, information recording/reproducing apparatus, information reproducing apparatus, and information recording medium
    1.
    发明授权
    Signal evaluation method, information recording/reproducing apparatus, information reproducing apparatus, and information recording medium 失效
    信号评估方法，信息记录/再现装置，信息再现装置和信息记录介质

    公开(公告)号：US07428203B2

    公开(公告)日：2008-09-23

    申请号：US10763247

    申请日：2004-01-26

    申请人： Yutaka Kashihara ,  Yuji Nagai ,  Shuichi Ookubo ,  Masatsugu Ogawa ,  Masaki Nakano ,  Toshiaki Iwanaga

    发明人： Yutaka Kashihara ,  Yuji Nagai ,  Shuichi Ookubo ,  Masatsugu Ogawa ,  Masaki Nakano ,  Toshiaki Iwanaga

    IPC分类号： G11B20/18

    CPC分类号： G11B20/10101 ,  G11B7/0062 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/10111 ,  G11B20/1816

    摘要： Reproduction signals include patterns for which recognition errors are likely. With respect to such patterns, probable error patterns are prepared. Tables showing correct patterns and error patterns are prepared, and evaluation values accurately representing signal quality are calculated. In an apparatus using a PRML method, discrimination data and a plurality of predetermined bit sequence pairs are examined to detect matching. A bit sequence and corresponding two ideal responses are calculated. Euclidean distances between the two ideal responses and equalization signals are obtained, and the difference between the Euclidean distances is further obtained. A quality evaluation value of a reproduction signal is calculated based on a mean value, a standard deviation, an appearance probability of the predetermined bit sequence, and a Hamming distance between the predetermined bit sequence pairs.

    摘要翻译： 繁殖信号包括识别错误可能的模式。 关于这种模式，准备可能的错误模式。 准备显示正确图案和错误图案的表格，并计算准确表示信号质量的评价值。 在使用PRML方法的装置中，检查鉴别数据和多个预定位序列对以检测匹配。 计算一个位序列和相应的两个理想响应。 获得两个理想响应和均衡信号之间的欧氏距离，并进一步获得欧氏距离之间的差异。 基于平均值，标准偏差，预定比特序列的出现概率以及预定比特序列对之间的汉明距离来计算再现信号的质量评估值。

    Information recording and reproducing apparatus, evaluation method, and information recording and reproducing medium
    6.
    发明授权
    Information recording and reproducing apparatus, evaluation method, and information recording and reproducing medium 有权

    公开(公告)号：US07139231B2

    公开(公告)日：2006-11-21

    申请号：US10387134

    申请日：2003-03-13

    申请人： Yuji Nagai ,  Yutaka Kashihara ,  Akihito Ogawa

    发明人： Yuji Nagai ,  Yutaka Kashihara ,  Akihito Ogawa

    IPC分类号： G11B20/10

    CPC分类号： G11B20/1816 ,  G11B7/0062 ,  G11B20/10009 ,  G11B20/10111

    摘要： An evaluation method for calculating an identification signal by using PRML, comprises a table storing true patterns and ideal signals thereof, false patterns corresponding to the true patterns and ideal signals thereof, and Euclidean distance between the true pattern and the false pattern, a calculating unit, when a recording signal synchronized with an identification signal coincides with any pattern of the table, calculates a distance between Euclidean distance between the ideal signal of the true pattern and a reproduction signal and Euclidean distance between the ideal signal of the false pattern and a reproduction signal, and an evaluation unit which evaluates an identification signal by using an average and standard deviation of difference. A table for patterns is created for a likely mistaken pattern, whereby calculating an evaluation value with high precision, of a signal quality, with a small amount of calculation.

    Modulator, modulation method, and method of manufacturing an optical recordable medium with enhanced security for confidential information
    10.
    发明授权
    Modulator, modulation method, and method of manufacturing an optical recordable medium with enhanced security for confidential information 有权
    调制器，调制方法和制造具有增强的机密信息安全性的光可记录介质的方法

    公开(公告)号：US07091887B2

    公开(公告)日：2006-08-15

    申请号：US11056349

    申请日：2005-02-10

    申请人： Yuji Nagai ,  Yutaka Kashihara ,  Tadashi Kojima

    发明人： Yuji Nagai ,  Yutaka Kashihara ,  Tadashi Kojima

    IPC分类号： H03M5/00 ,  G11B7/0045

    CPC分类号： G11B20/00086 ,  G11B20/0021 ,  G11B20/00362 ,  G11B20/00492 ,  G11B20/00579 ,  G11B20/00927 ,  G11B2020/1457

    摘要： A modulator includes a replacement processing unit which replaces a part of main information code-converted in a main information converter with specific information code-converted in a specific information converter and a direct-current component suppress processing unit which performs direct-current component suppress processing for the main information which has undergone the replacement processing in the replacement processing unit. The direct-current component suppress processing can be performed for the main information after the replacement processing of the main information with the specific information to prevent deterioration in direct-current component suppress characteristics due to the replacement processing.

    摘要翻译： 调制器包括替换处理单元，该替换处理单元将特定信息转换器中的特定信息代码转换的主信息代码转换的一部分替换为特定信息转换器中的代码转换器，以及执行直流分量抑制处理的直流分量抑制处理单元 对于在替换处理单元中进行了替换处理的主要信息。 可以对具有特定信息的主信息的替换处理之后的主信息执行直流分量抑制处理，以防止由替换处理引起的直流分量抑制特性的劣化。