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    Information recording and reproducing apparatus, evaluation method, and information recording and reproducing medium
    14.
    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.

    Optical disk reproduction apparatus and optical disk reproduction method
    18.
    发明申请
    Optical disk reproduction apparatus and optical disk reproduction method 失效
    光盘再现装置和光盘再现方法

    公开(公告)号：US20050094515A1

    公开(公告)日：2005-05-05

    申请号：US10935183

    申请日：2004-09-08

    申请人： Yuji Nagai ,  Akihito Ogawa

    发明人： Yuji Nagai ,  Akihito Ogawa

    IPC分类号： G11B20/10 ,  G11B7/005 ,  G11B7/007 ,  G11B20/14 ,  G11B7/00 ,  G11B5/09

    CPC分类号： G11B20/10009 ,  G11B7/0053 ,  G11B7/24082 ,  G11B20/10333

    摘要： There are provided a wobble signal reading unit configured to read a signal corresponding to a wobble formed at a predetermined track from an optical disk on which address information is recorded by applying phase modulation to the wobble formed at the track, an address information reproducing unit configured to reproduce the address information by applying phase detecting processing to the wobble signal read at the wobble signal reading unit, and binarizing an amplitude of an obtained phase detection signal by being compared with a predetermined threshold value, and a correcting unit configured to correct asymmetry of the amplitude generated in the phase detection signal obtained by the address information reproducing unit with respect to the predetermined threshold value at the time of reading the wobble signal from the predetermined track by the wobble signal reading unit.

    摘要翻译： 提供了一种摆动信号读取单元，其被配置为从对从轨道形成的摆动施加相位调制的光盘上读取对应于在预定轨道上形成的摆动的信号，所述摆动地址信息被记录在地址信息上，地址信息再现单元配置 通过对在摆动信号读取单元读取的摆动信号进行相位检测处理来再现地址信息，并将所获得的相位检测信号的幅度与预定阈值进行二值化，以及修正单元， 在通过摆动信号读取单元从预定轨迹读取摆动信号时，由地址信息再现单元获得的相位检测信号中产生的相对于预定阈值产生的振幅。

    Information recording and reproducing apparatus, evaluation method, and information recording and reproducing medium
    20.
    发明申请
    Information recording and reproducing apparatus, evaluation method, and information recording and reproducing medium 失效
    信息记录和再现装置，评估方法和信息记录和再现介质

    公开(公告)号：US20060280093A1

    公开(公告)日：2006-12-14

    申请号：US11501705

    申请日：2006-08-10

    申请人： Yuji Nagai ,  Yutaka Kashihara ,  Akihito Ogawa

    发明人： Yuji Nagai ,  Yutaka Kashihara ,  Akihito Ogawa

    IPC分类号： G11B5/09

    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.

    摘要翻译： 一种用于通过使用PRML来计算识别信号的评估方法，包括存储真实图案及其理想信号的表，与其真实图案和理想信号相对应的伪图案，以及真图案与假图案之间的欧氏距离，计算单元 当与识别信号同步的记录信号与表格的任何图形一致时，计算真实图案的理想信号与再现信号之间的欧几里德距离与假图案的理想信号之间的欧几里德距离与再现 信号和评估单元，其通过使用差的平均和标准差来评估识别信号。 创建用于模式的表格用于可能的错误模式，由此以较少的计算量以高精度计算信号质量的评估值。