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1. 发明授权

US07054088B2 Information recording and reproducing apparatus and method, and signal decoding circuit for performing timing recovery 失效
公开(公告)号：US07054088B2
公开(公告)日：2006-05-30
申请号：US10273485
申请日：2002-10-18
申请人： Akihiro Yamazaki , Takao Sugawara , Motomu Takatsu , Masaru Sawada
发明人： Akihiro Yamazaki , Takao Sugawara , Motomu Takatsu , Masaru Sawada
IPC分类号： G11B5/35
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/18
摘要： A timing recovery unit detects a phase offset and a frequency offset from a head area of reproduction data and initially corrects them. The timing recovery unit stores data in which a head reproduction signal has been made to be discrete by a fixed clock into a buffer. A phase offset detector detects the phase offset from the data head area in parallel with the operation for writing the data into the buffer. At the same time, a frequency offset detector detects the frequency offset from the data head area in parallel with the operation for writing the data into the buffer. A correction value of the detected phase offset and a correction value of the detected frequency offset are initially set into a digital PLL. While the data is read out from the buffer, a frequency lead-in and a phase lead-in are executed in the head area.

2. 发明授权

US07515369B2 Information recording and reproducing apparatus and method, and signal decoding circuit for performing timing recovery 失效
标题翻译：信息记录和再现装置和方法以及用于执行定时恢复的信号解码电路
公开(公告)号：US07515369B2
公开(公告)日：2009-04-07
申请号：US11388377
申请日：2006-03-24
申请人： Takao Sugawara , Motomu Takatsu , Masaru Sawada
发明人： Takao Sugawara , Motomu Takatsu , Masaru Sawada
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/18
摘要： A timing recovery unit detects a phase offset and a frequency offset from a head area of reproduction data and initially corrects them. The timing recovery unit stores data in which a head reproduction signal has been made to be discrete by a fixed clock into a buffer. A phase offset detector detects the phase offset from the data head area in parallel with the operation for writing the data into the buffer. At the same time, a frequency offset detector detects the frequency offset from the data head area in parallel with the operation for writing the data into the buffer. A correction value of the detected phase offset and a correction value of the detected frequency offset are initially set into a digital PLL. While the data is read out from the buffer, a frequency lead-in and a phase lead-in are executed in the head area.
摘要翻译：定时恢复单元从再现数据的头部区域检测相位偏移和频率偏移，并且最初校正它们。定时恢复单元将已经通过固定时钟将头重放信号离散的数据存储到缓冲器中。相位偏移检测器与将数据写入缓冲器的操作并行地检测与数据头区域的相位偏移。同时，频率偏移检测器与将数据写入缓冲器的操作并行地检测数据头区域的频率偏移。检测到的相位偏移的校正值和检测到的频率偏移的校正值最初被设置为数字PLL。当从缓冲器中读出数据时，在头部区域中执行频率导入和相位导入。

3. 发明申请

US20050099907A1 Training method for recording medium reproduction equalizer and recording medium reproduction apparatus 失效
标题翻译：用于记录媒体再现均衡器和记录介质再现装置的训练方法
公开(公告)号：US20050099907A1
公开(公告)日：2005-05-12
申请号：US10722915
申请日：2003-11-26
申请人： Masaru Sawada , Motomu Takatsu , Takao Sugawara
发明人： Masaru Sawada , Motomu Takatsu , Takao Sugawara
IPC分类号： G11B20/10 , G11B7/00 , H03H17/02 , H03H21/00
CPC分类号： G11B20/10046 , G11B20/10009 , G11B20/10481
摘要： In a training operation for optimizing a multiplication coefficient for each tap of an FIR equalizer equalizing a read signal read from a recording medium, as a restricted coefficient updating vector applied for updating the multiplication coefficient for each tap of the FIR filter, a vector is utilized which is obtained by projecting, onto a plane perpendicular to a predetermined restricting conditional vector, a coefficient updating vector determined based on an equalizer error between the output of the FIR equalizer and a reproduction output determined therefrom and a delayed input value for each tap of the FIR equalizer. As the restricting conditional vector, a vector is utilized which is a difference between a subsequent coefficient vector obtained in the same condition immediately subsequent to and an antecedent coefficient vector obtained in the same condition immediately antecedent to a reference coefficient comprising the multiplication coefficient for the equalizer obtained upon calculating the equalizer error.
摘要翻译：在用于优化均衡从记录介质读取的读取信号的FIR均衡器的每个抽头的乘法系数的训练操作中，作为用于更新FIR滤波器的每个抽头的乘法系数的受限系数更新向量，使用向量其通过将垂直于预定的限制条件向量的平面投影到基于FIR均衡器的输出与由其确定的再现输出之间的均衡器误差确定的系数更新向量和每个抽头的每个抽头的延迟输入值而获得 FIR均衡器作为限制条件向量，使用作为在紧随其后的相同条件下获得的后续系数向量与在与包括均衡器的乘法系数的参考系数紧密相关的条件下获得的先前系数向量之间的差的向量在计算均衡器误差时获得。

4. 发明授权

US07286596B2 Training method for recording medium reproduction equalizer and recording medium reproduction apparatus 失效
标题翻译：用于记录媒体再现均衡器和记录介质再现装置的训练方法
公开(公告)号：US07286596B2
公开(公告)日：2007-10-23
申请号：US10722915
申请日：2003-11-26
申请人： Masaru Sawada , Motomu Takatsu , Takao Sugawara
发明人： Masaru Sawada , Motomu Takatsu , Takao Sugawara
IPC分类号： H03H7/30 , H03K5/159
CPC分类号： G11B20/10046 , G11B20/10009 , G11B20/10481
摘要： In a training operation for optimizing a multiplication coefficient for each tap of an FIR equalizer equalizing a read signal read from a recording medium, as a restricted coefficient updating vector applied for updating the multiplication coefficient for each tap of an FIR filter, a vector is utilized which is obtained by projecting, onto a plane perpendicular to a predetermined restricting conditioning vector, a coefficient updating vector determined based on an equalizer error between the output of the FIR equalizer and a reproduction output determined therefrom and a delayed input value for each tap of the FIR equalizer. As the restricting conditioning vector, a vector is utilized which is a difference between a subsequent coefficient vector obtained in the same condition immediately subsequent to and an antecedent coefficient vector obtained in the same condition immediately antecedent to a reference coefficient comprising the multiplication coefficient for the equalizer obtained upon calculating the equalizer error.
摘要翻译：在用于优化均衡从记录介质读取的读取信号的FIR均衡器的每个抽头的乘法系数的训练操作中，作为用于更新FIR滤波器的每个抽头的乘法系数的受限系数更新向量，使用向量其通过将垂直于预定的限制调节向量的平面投影到基于FIR均衡器的输出与由其确定的再现输出之间的均衡器误差确定的系数更新向量和每个抽头的每个抽头的延迟输入值而获得 FIR均衡器作为限制调节向量，使用这样的矢量，该矢量是在紧随其后的相同条件下获得的后续系数矢量与在与包括均衡器的乘法系数的参考系数紧邻的相同条件下获得的先前系数矢量之间的差值在计算均衡器误差时获得。

5. 发明申请

US20060181797A1 Information recording and reproducing apparatus and method, and signal decoding circuit for performing timing recovery 失效
公开(公告)号：US20060181797A1
公开(公告)日：2006-08-17
申请号：US11388377
申请日：2006-03-24
申请人： Takao Sugawara , Motomu Takatsu , Masaru Sawada
发明人： Takao Sugawara , Motomu Takatsu , Masaru Sawada
IPC分类号： G11B5/09 , G11B5/035
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/18
摘要： A timing recovery unit detects a phase offset and a frequency offset from a head area of reproduction data and initially corrects them. The timing recovery unit stores data in which a head reproduction signal has been made to be discrete by a fixed clock into a buffer. A phase offset detector detects the phase offset from the data head area in parallel with the operation for writing the data into the buffer. At the same time, a frequency offset detector detects the frequency offset from the data head area in parallel with the operation for writing the data into the buffer. A correction value of the detected phase offset and a correction value of the detected frequency offset are initially set into a digital PLL. While the data is read out from the buffer, a frequency lead-in and a phase lead-in are executed in the head area.

6. 发明授权

US07031090B2 Information recording and reproducing apparatus and method and signal decoding circuit having improved noise processing characteristics 失效
标题翻译：具有改善的噪声处理特性的信息记录和再现装置和方法和信号解码电路
公开(公告)号：US07031090B2
公开(公告)日：2006-04-18
申请号：US10045738
申请日：2001-10-29
申请人： Kazuhito Ichihara , Takao Sugawara , Yuichi Sato , Toshihiko Morita , Motomu Takatsu
发明人： Kazuhito Ichihara , Takao Sugawara , Yuichi Sato , Toshihiko Morita , Motomu Takatsu
IPC分类号： G11B5/035
CPC分类号： G11B20/10009
摘要： In a Maximum A posteriori Probability decoding (MAP decoding), a correlation and a deviation of noises for past and future states which depend on input signal patterns in past N bits and future Q bits are calculated by training by a noise correlation arithmetic operating unit 84 and they are stored. Upon reproduction, in a white noise arithmetic operating unit 91, white noise values for the past and future states in which colored noises are converted into white noises are obtained by using the stored correlation and deviation of the noises. In an input signal arithmetic operating unit 92, an input signal (channel information) Λc(yk|Smk) of the MAP decoding is calculated from the white noise values and the deviation for the past and future states. A likelihood in the MAP decoding is obtained from the input signal.
摘要翻译：在最大后验概率解码（MAP解码）中，依赖于过去N位和未来Q位中的输入信号模式的过去和未来状态的噪声的相关和偏差由噪声相关运算单元84进行训练并存储它们。在再现时，在白噪声运算单元91中，通过使用所存储的噪声的相关性和偏差来获得将彩色噪声转换成白噪声的过去和未来状态的白噪声值。在输入信号算术运算单元92中，MAP解码器的输入信号（信道信息）Lambdac（y k k S k S m S k）由白噪声值和过去和未来状态的偏差计算得出。从输入信号获得MAP解码中的似然。

7. 发明申请

US20050225458A1 Recording and reproducing apparatus 有权
标题翻译：记录和再现设备
公开(公告)号：US20050225458A1
公开(公告)日：2005-10-13
申请号：US10982610
申请日：2004-11-05
申请人： Toshio Ito , Masaru Sawada , Toshihiko Morita , Takao Sugawara
发明人： Toshio Ito , Masaru Sawada , Toshihiko Morita , Takao Sugawara
IPC分类号： G11B20/10 , G11B5/09 , G11B20/14 , G11B20/18 , H03M5/14 , H03M7/14 , H03M7/00
CPC分类号： H03M5/145 , G11B20/1426
摘要： A recording and reproducing apparatus includes an RLL encoder that encodes an information bit string to a code bit string and a RLL decoder that decodes the code bit string to the information bit string. The RLL encoder encodes the information bit string to the code bit string of a run-length-limited code at a high encoding rate satisfying a plurality of conditions of constraint regarding a string of successive zeros. The RLL decoder decodes the code bit string encoded by the RLL encoder to the information bit string.
摘要翻译：记录和再现装置包括将信息位串编码为码位串的RLL编码器和将码位串解码为信息位串的RLL解码器。 RLL编码器以满足关于连续零串的多个约束条件的高编码率将信息位串编码为游程长度受限码的码位串。 RLL解码器将由RLL编码器编码的码位串解码为信息位串。

8. 发明授权

US07138931B2 Recording and reproducing apparatus 有权
标题翻译：记录和再现设备
公开(公告)号：US07138931B2
公开(公告)日：2006-11-21
申请号：US10982610
申请日：2004-11-05
申请人： Toshio Ito , Masaru Sawada , Toshihiko Morita , Takao Sugawara
发明人： Toshio Ito , Masaru Sawada , Toshihiko Morita , Takao Sugawara
IPC分类号： H03M7/00
CPC分类号： H03M5/145 , G11B20/1426
摘要： A recording and reproducing apparatus includes an RLL encoder that encodes an information bit string to a code bit string and a RLL decoder that decodes the code bit string to the information bit string. The RLL encoder encodes the information bit string to the code bit string of a run-length-limited code at a high encoding rate satisfying a plurality of conditions of constraint regarding a string of successive zeros. The RLL decoder decodes the code bit string encoded by the RLL encoder to the information bit string.
摘要翻译：记录和再现装置包括将信息位串编码为码位串的RLL编码器和将码位串解码为信息位串的RLL解码器。 RLL编码器以满足关于连续零串的多个约束条件的高编码率将信息位串编码为游程长度受限码的码位串。 RLL解码器将由RLL编码器编码的码位串解码为信息位串。

9. 发明授权

US07035029B2 Method of and apparatus for recording/reading information, circuit for recording/reading signal 失效
标题翻译：用于记录/读取信息的方法和装置，用于记录/读取信号的电路
公开(公告)号：US07035029B2
公开(公告)日：2006-04-25
申请号：US10776748
申请日：2004-02-11
申请人： Masaru Sawada , Toshihiko Morita , Takao Sugawara
发明人： Masaru Sawada , Toshihiko Morita , Takao Sugawara
IPC分类号： G11B5/09
CPC分类号： G11B20/1025 , G11B5/012 , G11B20/1403 , G11B20/1426 , G11B27/3027 , G11B2220/20
摘要： An information recording/reading apparatus employs a preamble to reproduce a clock used when recording information in a recording medium and reads the information out of the recording medium at a timing synchronized with a read signal. The preamble is split and recorded by replacing a middle portion of the preamble with data and a sync byte. While a first buffer is employed to delay signal data read out of the recording medium, a frequency offset detector detects a frequency offset using the split preamble.
摘要翻译：信息记录/读取装置采用前导码来再现在记录介质中记录信息时使用的时钟，并且以与读取信号同步的定时将信息从记录介质读出。通过用数据和同步字节代替前导码的中间部分来分割和记录前导码。当使用第一缓冲器来延迟从记录介质读出的信号数据时，频率偏移检测器使用分离前导码检测频率偏移。

10. 发明申请

US20050066261A1 Method, apparatus, and circuit for record reproduction 有权
标题翻译：用于记录再现的方法，装置和电路
公开(公告)号：US20050066261A1
公开(公告)日：2005-03-24
申请号：US10869585
申请日：2004-06-16
申请人： Toshihiko Morita , Mitsuhiko Ohta , Takao Sugawara
发明人： Toshihiko Morita , Mitsuhiko Ohta , Takao Sugawara
IPC分类号： G06F11/08 , G06F11/10 , G11B20/14 , G11B20/18 , H03M7/14 , H03M13/00 , H03M13/09 , H03M13/11 , H03M13/17 , H03M13/19
CPC分类号： H03M13/6325 , G11B20/1833 , G11B20/1866 , G11B2020/1863 , H03M13/1102 , H03M13/1515 , H03M13/17 , H03M13/3746
摘要： A record reproduction apparatus includes an encoding unit that encodes sector data to be written into a recording medium, by dividing the data into a predetermined number of blocks, and an iterative decoding unit that iteratively decodes the sector data read from the recording medium, by dividing the sector data into the predetermined number of blocks.
摘要翻译：记录重放装置包括编码单元，其通过将数据划分成预定数量的块来编码要写入记录介质的扇区数据，以及迭代解码单元，其对从记录介质读取的扇区数据进行迭代解码，将扇区数据转换成预定数量的块。

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