公开(公告)号：US07388523B2

公开(公告)日：2008-06-17

申请号：US11484933

申请日：2006-07-12

申请人： Akihiro Itakura ,  Toshikazu Kanaoka ,  Toshio Ito

发明人： Akihiro Itakura ,  Toshikazu Kanaoka ,  Toshio Ito

IPC分类号： H03M5/00

CPC分类号： H03M5/145

摘要： An MTR encoder includes convolution units that perform convolution of input data using additional bits, MTR encoding units that MTR-encode data obtained by the convolution units, RDS calculating units and on-bit sequence checking units that calculate RDSs and counts the number of sequential on-bits of the data MTR-encoded by the MTR encoding units, respectively, and a selecting unit that selects optimum data based on the RDSs and the number of sequential on-bits.

摘要翻译： MTR编码器包括使用附加位执行输入数据的卷积的卷积单元，对由卷积单元获得的数据进行MTR编码的MTR编码单元，RDS计算单元和计算RDS的计数单元，并对序列数进行计数 分别由MTR编码单元MTR编码的数据的一行和选择单元，其基于RDS和顺序导通位数选择最佳数据。

公开(公告)号：US07130257B2

公开(公告)日：2006-10-31

申请号：US10620385

申请日：2003-07-17

申请人： Masakazu Taguchi ,  Akihiro Itakura

发明人： Masakazu Taguchi ,  Akihiro Itakura

IPC分类号： G11B20/10

CPC分类号： G11B20/10055 ,  G11B20/10009

摘要： A recording/reproducing apparatus records and reproduces, over a partial response channel, a recording signal produced by encoding data according to a convolutional code and reproduces the data from a reproduction signal by iterative decoding using likelihood information. A burst error detector detects a burst error part in the reproduction signal. A substituting part substitutes, for a sampling value included in the burst error part, a predetermined value according to a detected result of the burst error detector.

摘要翻译： 记录/再现装置通过部分响应信道记录和再现根据卷积码对数据进行编码而产生的记录信号，并通过使用似然信息的迭代解码从再现信号再现数据。 突发错误检测器检测再现信号中的突发错误部分。 根据突发错误检测器的检测结果，替换部分将包括在突发错误部分中的采样值替换为预定值。

公开(公告)号：US07058878B2

公开(公告)日：2006-06-06

申请号：US10368416

申请日：2003-02-20

申请人： Toshikazu Kanaoka ,  Masakazu Taguchi ,  Akihiro Itakura

发明人： Toshikazu Kanaoka ,  Masakazu Taguchi ,  Akihiro Itakura

IPC分类号： H03M13/03

CPC分类号： H03M13/2957 ,  H03M13/6331

摘要： A data signal processing apparatus is capable of reproducing original data with a small number of repetition times of an iterative decoding process, which is realized by likelihood information operating means that generate updated likelihood information, carry out a predetermined operation on a plurality of pieces of likelihood information corresponding to the original data obtained by the iterative decoding process, and reproduce the original data.

公开(公告)号：US06754141B1

公开(公告)日：2004-06-22

申请号：US09591445

申请日：2000-06-09

申请人： Akiyoshi Uchida ,  Masakazu Taguchi ,  Akihiro Itakura

发明人： Akiyoshi Uchida ,  Masakazu Taguchi ,  Akihiro Itakura

IPC分类号： G11B1100

CPC分类号： G11B11/10528 ,  G11B11/10515 ,  G11B11/1053 ,  G11B11/10584 ,  G11B11/10595

摘要： A magneto-optical recording medium, a method for recording and reproducing data using the medium and a magneto-optical recording apparatus are provided in which an optical head reads the recorded data while applying a magnetic field, and the ill effect of the leakage magnetic field from the neighboring tracks can be suppressed so as to obtain a correctly read signal. The magneto-optical recording medium includes a recording layer, an intermediate layer and a reproduction layer. The signal recorded in the recording layer is read using a light beam irradiated externally and a magnetic field applied externally. The signal recorded in the recording layer is transferred to the reproduction layer via the intermediate layer. Marks are recorded so that each of leading and trailing edges of a recorded mark is substantially aligned with center portions of a recorded mark or a space of neighboring tracks, and the neighboring tracks have different polarities. When reproducing the marks, the signal including the recorded mark is read under the condition where the influences of the leakage magnetic fields from the neighboring tracks counterbalance each other.

摘要翻译： 提供一种磁光记录介质，使用介质记录和再现数据的方法以及磁光记录装置，其中光头在施加磁场时读取记录数据，并且泄漏磁场的不良影响 可以抑制来自相邻轨道的信号，以获得正确读取的信号。 磁光记录介质包括记录层，中间层和再现层。 使用外部照射的光束和外部施加的磁场来读取记录在记录层中的信号。 记录在记录层中的信号经由中间层传送到再现层。 记录标记，使得记录标记的前缘和后缘中的每一个基本上与记录的标记的中心部分或相邻轨道的空间对准，并且相邻的轨道具有不同的极性。 当再现标记时，在来自相邻轨道的泄漏磁场的影响相互平衡的条件下，读取包括记录标记的信号。

公开(公告)号：US06255911B1

公开(公告)日：2001-07-03

申请号：US09453973

申请日：1999-12-03

申请人： Takahiro Niwa ,  Akihiro Itakura

发明人： Takahiro Niwa ,  Akihiro Itakura

IPC分类号： H03L7085

CPC分类号： H03L7/191 ,  G11B20/1403 ,  H03L7/0891 ,  H03L7/14

摘要： A PLL circuit used in an apparat as for reading and writing data to a disk compensates for noise which causes a false clock signal or for missing clock signals which can be caused by a scratch or smudge on the surface of the disc. The PLL circuit includes a phase comparator for comparing a phase of a reference signal with a phase of a feedback signal and generates a phase difference signal. A charge pump receives the phase difference signal and generates an output signal, which is filtered by a low pass filter. The filtered signal is provided to a voltage controlled oscillator, which generates an oscillation output signal. A divider divides the oscillation output signal and generates the feedback signal. A time information generating circuit generates time information of the oscillation output signal, indicating the time period where it is presumed the reference signal is or should be received. A control circuit, using the time information, permits the output of the oscillation output signal when the reference signal is input during the presumed time period and maintains the output of the oscillation output signal when the reference signal is not received during the presumed time period.

摘要翻译： 用于读取和写入数据的盘片中的PLL电路可以补偿导致错误时钟信号的噪声，或丢失时钟信号，这些时钟信号可能会由于光盘表面的划痕或污迹而引起。 PLL电路包括用于将参考信号的相位与反馈信号的相位进行比较的相位比较器，并产生相位差信号。 电荷泵接收相位差信号并产生由低通滤波器滤波的输出信号。 滤波后的信号被提供给压控振荡器，其产生振荡输出信号。 分频器分频振荡输出信号并产生反馈信号。 时间信息产生电路产生振荡输出信号的时间信息，指示假设参考信号是或应该被接收的时间段。 使用时间信息的控制电路允许在推定的时间周期期间输入参考信号时的振荡输出信号的输出，并且在推定的时间段期间当没有接收到参考信号时保持振荡输出信号的输出。

公开(公告)号：US5883863A

公开(公告)日：1999-03-16

申请号：US918773

申请日：1997-08-25

申请人： Akihiro Itakura ,  Masakazu Taguchi

发明人： Akihiro Itakura ,  Masakazu Taguchi

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10515 ,  G11B11/10508 ,  G11B11/10586

摘要： To provide a magneto-optical reading method of making the inclinations of the front and rear edges of a waveform of a reading signal formed on a magneto-optical recording medium to be read more symmetric by applying a reading magnetic field different in accordance with the direction of a recording magnetic field when reading the recording marks to which recording magnetic fields in different directions are applied for recording because the present ranges of the front and rear edges are previously determined.

摘要翻译： 为了提供磁光读取方法，通过施加根据方向不同的读取磁场，使形成在磁光记录介质上的读取信号的波形的前后边缘的倾斜度更加对称 当预先确定前边缘和后边缘的当前范围时，读取记录磁迹的记录磁场时，记录不同方向记录的磁场用于记录。

公开(公告)号：US5872754A

公开(公告)日：1999-02-16

申请号：US799895

申请日：1997-02-13

申请人： Masakazu Taguchi ,  Michio Matsuura ,  Yoshihide Fujita ,  Akihiro Itakura

发明人： Masakazu Taguchi ,  Michio Matsuura ,  Yoshihide Fujita ,  Akihiro Itakura

IPC分类号： G11B7/00 ,  G11B7/0037 ,  G11B7/005 ,  G11B20/10

CPC分类号： G11B20/10009 ,  G11B7/0037 ,  G11B7/005

摘要： A data reproduction apparatus assuring compatibility of optical disks capable of reproducing both pit-position recorded data and edge-position recorded data in optical disks by digital operation by using digital values obtained by sampling reproduction signals. A reproduction signal obtained by an optical head is converted into a digital value by a first A/D converter, and on the basis of the converted digital value, pit-position recorded data is recorded by a pit-position detector. Moreover, the reproduction signal obtained by the optical head is converted into digital values by first and second A/D converters, and on the basis of the converted digital values, front edge and rear edge maximum likelihood decoded data of edge-position recorded data are detected by first and second maximum likelihood detectors, and both maximum likelihood decoded data are synthesized by a synthesizer.

摘要翻译： 一种数据再现装置，通过使用通过对再现信号进行采样而获得的数字值，通过数字操作确保能够再现凹坑位置记录数据和边缘位置记录数据的光盘的兼容性。 通过光头获得的再现信号由第一A / D转换器转换为数字值，并且基于转换的数字值，凹坑位置记录数据由凹坑位置检测器记录。 此外，由光头获得的再现信号由第一和第二A / D转换器转换为数字值，并且基于转换的数字值，边缘位置记录数据的前沿和后沿最大似然解码数据是 由第一和第二最大似然检测器检测，最大似然解码数据由合成器合成。

公开(公告)号：US5796693A

公开(公告)日：1998-08-18

申请号：US781280

申请日：1997-01-10

申请人： Masakazu Taguchi ,  Michio Matsuura ,  Yoshihide Fujita ,  Akihiro Itakura

发明人： Masakazu Taguchi ,  Michio Matsuura ,  Yoshihide Fujita ,  Akihiro Itakura

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  H04L7/033 ,  H04L25/493

CPC分类号： G11B20/10148 ,  G11B20/10009 ,  G11B20/10083 ,  G11B20/10101 ,  G11B20/10111 ,  G11B20/1403 ,  H04L25/493 ,  H04L7/0334 ,  G11B7/005

摘要： A data reproduction apparatus of an optical disk having a maximum likelihood detection system for compensating a stationary edge shift and an edge shift depending on record pattern at the time of reproduction. The edge shift that has not completely been compensated at the time of recording in an optical disk is compensated by controlling an expected value in branch metric calculation of maximum likelihood detection while recognizing the pattern of record data at the time of reproduction. The edge shift amount is measured on the basis of the reproduction signal relative to the VFO area of the optical disk, and an expected value compensation table for showing an optimum expected value in branch metric calculation is selected preliminarily according to the measured amount. Thereby, the pattern of record data in the data area of the optical disk is recognized, the optimum expected value according to the recognized pattern of record data is determined by referring to the selected expected value compensation table, and the branch metric calculation is operated by using the optimum expected value.

摘要翻译： 一种光盘的数据再现装置，具有用于补偿静止边缘移位的最大似然检测系统和根据再现时的记录模式的边缘移位。 在记录光盘时尚未完全补偿的边缘偏移通过在再现时识别记录数据的模式来控制最大似然检测的分支度量计算中的预期值来补偿。 基于相对于光盘的VFO面积的再现信号测量边缘偏移量，并且根据测量量预先选择用于显示分支度量计算中的最佳期望值的期望值补偿表。 由此，识别光盘的数据区域中记录数据的图案，通过参照所选择的期望值补偿表来确定根据识别的记录数据模式的最佳期望值，并且分支量度计算由 使用最佳期望值。

公开(公告)号：US5740154A

公开(公告)日：1998-04-14

申请号：US825421

申请日：1997-03-28

申请人： Haruhiko Izumi ,  Masakazu Taguchi ,  Michio Matsuura ,  Yoshihide Fujita ,  Akihiro Itakura

发明人： Haruhiko Izumi ,  Masakazu Taguchi ,  Michio Matsuura ,  Yoshihide Fujita ,  Akihiro Itakura

IPC分类号： G11B20/12 ,  G11B7/003 ,  G11B7/007 ,  G11B11/10 ,  G11B11/105 ,  G11B27/30 ,  G11B7/24

CPC分类号： G11B7/00718 ,  G11B11/10578 ,  G11B27/3027 ,  G11B7/00745 ,  G11B20/12

摘要： The sector formats of adjacent record tracks are made different from each other so that a region of an ID signal of a header part of one of the record tracks is adjacent to a region (VFO part) other than an ID signal of a header part of the other record track and the regions of ID signals are not adjacent to each other. A crosstalk component from the VFO part which is the closest pattern is so small that it little affects the reproduction of an ID signal. Therefore, an ID signal is correctly reproduced.

摘要翻译： 使相邻记录磁道的扇区格式彼此不同，使得记录磁道之一的标题部分的ID信号的区域与除了标题部分的ID信号之外的区域（VFO部分）相邻 其他记录轨道和ID信号的区域彼此不相邻。 来自最接近图案的VFO部分的串扰分量非常小，以致它几乎不影响ID信号的再现。 因此，ID信号被正确再现。