公开(公告)号：US20070044006A1

公开(公告)日：2007-02-22

申请号：US11198945

申请日：2005-08-05

申请人： Shaohua Yang ,  Richard Galbraith ,  Ksenija Lakovic ,  Yuan Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce Wilson

发明人： Shaohua Yang ,  Richard Galbraith ,  Ksenija Lakovic ,  Yuan Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce Wilson

IPC分类号： H03M13/00

CPC分类号： H03M13/45 ,  G11B20/1833 ,  G11B2020/1863 ,  G11B2220/2516 ,  H03M13/098 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/256 ,  H03M13/2906 ,  H03M13/2909 ,  H03M13/2945 ,  H03M13/2957 ,  H03M13/3784 ,  H03M13/4146 ,  H03M13/6343

摘要： Two levels of error correction decoding are performed using first and second level decoders. A composite code formed by combining an inner component code and an outer component code can be used to decode the data and correct any errors. Performing two level decoding using a composite code allows the size of the inner parity block to be reduced to a single Reed-Solomon symbol while keeping a good code rate. The first level decoder generates soft information. The soft information can indicate a most likely error event for each possible syndrome value of the inner component code. The soft information can also include error metric values for each of the most likely error events. The second level decoder generates corrected syndrome values based on the soft information using the outer component code. The most likely trellis path that corresponds to the corrected syndrome values is then selected.

摘要翻译： 使用第一和第二级解码器执行两级纠错解码。 可以使用通过组合内部组件代码和外部组件代码形成的组合代码来解码数据并纠正任何错误。 使用复合代码执行两级解码允许内部奇偶校验块的大小减少到单个Reed-Solomon符号，同时保持良好的代码率。 第一级解码器产生软信息。 软信息可以指示内部组件代码的每个可能的综合征值的最可能的错误事件。 软信息还可以包括每个最可能的错误事件的误差度量值。 第二级解码器使用外部分量代码基于软信息生成校正的校正子值。 然后选择对应于校正的综合征值的最可能的网格路径。

公开(公告)号：US20070043997A1

公开(公告)日：2007-02-22

申请号：US11198943

申请日：2005-08-05

申请人： Shaohua Yang ,  Mario Blaum ,  Richard Galbraith ,  Ksenija Lakovic ,  Yuan Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi

发明人： Shaohua Yang ,  Mario Blaum ,  Richard Galbraith ,  Ksenija Lakovic ,  Yuan Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi

IPC分类号： H03M13/00

CPC分类号： H03M13/29 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/2903 ,  H03M13/2906

摘要： An error correction encoder inserts redundant parity information into a data stream to improve system reliability. The encoder can generate the redundant parity information using a composite code. Dummy bits are inserted into the data stream in locations reserved for parity information generated by subsequent encoding. The error correction code can have a uniform or a non-uniform span. The span corresponds to consecutive channel bits that are within a single block of a smaller parity code that is used to form a composite code. The span lengths can be variant across the whole codeword by inserting dummy bits in less than all of the spans.

摘要翻译： 纠错编码器将冗余奇偶校验信息插入到数据流中，以提高系统的可靠性。 编码器可以使用复合代码生成冗余奇偶校验信息。 在由后续编码生成的奇偶校验信息保留的位置中将虚拟位插入到数据流中。 纠错码可以具有均匀或不均匀的间距。 该跨度对应于用于形成复合代码的较小奇偶码的单个块内的连续通道位。 跨越整个码字的跨度长度可以通过在少于所有跨度的位置插入虚拟位而变化。

公开(公告)号：US20100235718A1

公开(公告)日：2010-09-16

申请号：US12787120

申请日：2010-05-25

申请人： Shaohua Yang ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce A. Wilson

发明人： Shaohua Yang ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce A. Wilson

IPC分类号： H03M13/45 ,  G06F11/10

CPC分类号： H03M13/45 ,  G11B20/1833 ,  G11B2020/1863 ,  G11B2220/2516 ,  H03M13/098 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/256 ,  H03M13/2906 ,  H03M13/2909 ,  H03M13/2945 ,  H03M13/2957 ,  H03M13/3784 ,  H03M13/4146 ,  H03M13/6343

摘要： Two levels of error correction decoding are performed using first and second level decoders. A composite code formed by combining an inner component code and an outer component code can be used to decode the data and correct any errors. Performing two level decoding using a composite code allows the size of the inner parity block to be reduced to a single Reed-Solomon symbol while keeping a good code rate. The first level decoder generates soft information. The soft information can indicate a most likely error event for each possible syndrome value of the inner component code. The soft information can also include error metric values for each of the most likely error events. The second level decoder generates corrected syndrome values based on the soft information using the outer component code. The most likely trellis path that corresponds to the corrected syndrome values is then selected.

摘要翻译： 使用第一和第二级解码器执行两级纠错解码。 可以使用通过组合内部组件代码和外部组件代码形成的组合代码来解码数据并纠正任何错误。 使用复合代码执行两级解码允许内部奇偶校验块的大小减少到单个Reed-Solomon符号，同时保持良好的代码率。 第一级解码器产生软信息。 软信息可以指示内部组件代码的每个可能的综合征值的最可能的错误事件。 软信息还可以包括每个最可能的错误事件的误差度量值。 第二级解码器使用外部分量代码基于软信息生成校正的校正子值。 然后选择对应于校正的综合征值的最可能的网格路径。

公开(公告)号：US07725800B2

公开(公告)日：2010-05-25

申请号：US11198945

申请日：2005-08-05

申请人： Shaohua Yang ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce A. Wilson

发明人： Shaohua Yang ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce A. Wilson

IPC分类号： H03M13/00 ,  H03M13/03

CPC分类号： H03M13/45 ,  G11B20/1833 ,  G11B2020/1863 ,  G11B2220/2516 ,  H03M13/098 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/256 ,  H03M13/2906 ,  H03M13/2909 ,  H03M13/2945 ,  H03M13/2957 ,  H03M13/3784 ,  H03M13/4146 ,  H03M13/6343

摘要： Two levels of error correction decoding are performed using first and second level decoders. A composite code formed by combining an inner component code and an outer component code can be used to decode the data and correct any errors. Performing two level decoding using a composite code allows the size of the inner parity block to be reduced to a single Reed-Solomon symbol while keeping a good code rate. The first level decoder generates soft information. The soft information can indicate a most likely error event for each possible syndrome value of the inner component code. The soft information can also include error metric values for each of the most likely error events. The second level decoder generates corrected syndrome values based on the soft information using the outer component code. The most likely trellis path that corresponds to the corrected syndrome values is then selected.

摘要翻译： 使用第一和第二级解码器执行两级纠错解码。 可以使用通过组合内部组件代码和外部组件代码形成的组合代码来解码数据并纠正任何错误。 使用复合代码执行两级解码允许内部奇偶校验块的大小减少到单个Reed-Solomon符号，同时保持良好的代码率。 第一级解码器产生软信息。 软信息可以指示内部组件代码的每个可能的综合征值的最可能的错误事件。 软信息还可以包括每个最可能的错误事件的误差度量值。 第二级解码器使用外部分量代码基于软信息生成校正的校正子值。 然后选择对应于校正的综合征值的最可能的网格路径。

公开(公告)号：US08423873B2

公开(公告)日：2013-04-16

申请号：US12787120

申请日：2010-05-25

申请人： Shaohua Yang ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce A. Wilson

发明人： Shaohua Yang ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi ,  Bruce A. Wilson

IPC分类号： H03M13/00

CPC分类号： H03M13/45 ,  G11B20/1833 ,  G11B2020/1863 ,  G11B2220/2516 ,  H03M13/098 ,  H03M13/1102 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/256 ,  H03M13/2906 ,  H03M13/2909 ,  H03M13/2945 ,  H03M13/2957 ,  H03M13/3784 ,  H03M13/4146 ,  H03M13/6343

摘要： Two levels of error correction decoding are performed using first and second level decoders. A composite code formed by combining an inner component code and an outer component code can be used to decode the data and correct any errors. Performing two level decoding using a composite code allows the size of the inner parity block to be reduced to a single Reed-Solomon symbol while keeping a good code rate. The first level decoder generates soft information. The soft information can indicate a most likely error event for each possible syndrome value of the inner component code. The soft information can also include error metric values for each of the most likely error events. The second level decoder generates corrected syndrome values based on the soft information using the outer component code. The most likely trellis path that corresponds to the corrected syndrome values is then selected.

摘要翻译： 使用第一和第二级解码器执行两级纠错解码。 可以使用通过组合内部组件代码和外部组件代码形成的组合代码来解码数据并纠正任何错误。 使用复合代码执行两级解码允许内部奇偶校验块的大小减少到单个Reed-Solomon符号，同时保持良好的代码率。 第一级解码器产生软信息。 软信息可以指示内部组件代码的每个可能的综合征值的最可能的错误事件。 软信息还可以包括每个最可能的错误事件的误差度量值。 第二级解码器使用外部分量代码基于软信息生成校正的校正子值。 然后选择对应于校正的综合征值的最可能的网格路径。

公开(公告)号：US07590920B2

公开(公告)日：2009-09-15

申请号：US11198943

申请日：2005-08-05

申请人： Shaohua Yang ,  Mario Blaum ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi

发明人： Shaohua Yang ,  Mario Blaum ,  Richard Leo Galbraith ,  Ksenija Lakovic ,  Yuan Xing Lee ,  Travis Oenning ,  Jongseung Park ,  Hideki Sawaguchi

IPC分类号： H03M13/00

CPC分类号： H03M13/29 ,  H03M13/1515 ,  H03M13/152 ,  H03M13/2903 ,  H03M13/2906

摘要： An error correction encoder inserts redundant parity information into a data stream to improve system reliability. The encoder can generate the redundant parity information using a composite code. Dummy bits are inserted into the data stream in locations reserved for parity information generated by subsequent encoding. The error correction code can have a uniform or a non-uniform span. The span corresponds to consecutive channel bits that are within a single block of a smaller parity code that is used to form a composite code. The span lengths can be variant across the whole codeword by inserting dummy bits in less than all of the spans.

摘要翻译： 纠错编码器将冗余奇偶校验信息插入到数据流中，以提高系统的可靠性。 编码器可以使用复合代码生成冗余奇偶校验信息。 在由后续编码生成的奇偶校验信息保留的位置中将虚拟位插入到数据流中。 纠错码可以具有均匀或不均匀的间距。 该跨度对应于用于形成复合代码的较小奇偶码的单个块内的连续通道位。 跨越整个码字的跨度长度可以通过在少于所有跨度的位置插入虚拟位而变化。

公开(公告)号：US20110013306A1

公开(公告)日：2011-01-20

申请号：US12923307

申请日：2010-09-14

申请人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Hisashi Takano ,  Hiroyuki Tsuchinaga

发明人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Hisashi Takano ,  Hiroyuki Tsuchinaga

IPC分类号： G11B5/09

CPC分类号： G11B20/10009 ,  G11B5/09 ,  G11B20/10203 ,  G11B2005/0016 ,  G11B2005/0029

摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.

摘要翻译： 为了有效地抑制中等噪声和信号失真集中的低频区域中的信号，为了有效地利用低频区域中的再现信号的检测分量，将垂直方向的部分响应均衡的目标 记录再现信号被设定为使得直流电流周围的低频分量被抑制到有效抑制和有效利用两者的规定量。 因此，通过部分响应均衡的目标来执行最大似然解码处理。 数据检测的可靠性进一步提高，信噪比得到改善，从而可以进一步降低来自记录介质的噪声，并且可以提供高密度的磁记录/重放装置。

公开(公告)号：US07443625B2

公开(公告)日：2008-10-28

申请号：US11404780

申请日：2006-04-17

申请人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Hisashi Takano ,  Yohji Maruyama ,  Hiroshi Ide ,  Hideki Sawaguchi ,  Futoshi Tomiyama

发明人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Hisashi Takano ,  Yohji Maruyama ,  Hiroshi Ide ,  Hideki Sawaguchi ,  Futoshi Tomiyama

IPC分类号： G11B5/02

CPC分类号： G11B5/012 ,  G11B5/4886 ,  G11B27/02

摘要： In the present invention, by making the width of the write element larger than the track pitch and securing a write magnetic field strong enough to reverse the magnetization of the magnetic layer, and further by writing while shifting a write head comprising the write element, a magnetic disk drive, of which the track width is narrower than the write element width, and the storage capacity is large, is realized.

摘要翻译： 在本发明中，通过使写入元件的宽度大于轨道间距，并且确保写入磁场足够强以反转磁性层的磁化，并且进一步通过在包括写入元件的写入头的移位的同时进行写入， 磁盘驱动器，其轨道宽度比写入元件宽度窄，并且存储容量大。

公开(公告)号：US07092181B2

公开(公告)日：2006-08-15

申请号：US11196385

申请日：2005-08-04

申请人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi

发明人： Yasutaka Nishida ,  Takehiko Hamaguchi ,  Hideki Sawaguchi

IPC分类号： G11B5/09

CPC分类号： G11B20/10046 ,  G11B5/012 ,  G11B5/09 ,  G11B5/59633 ,  G11B20/10009 ,  G11B20/10481 ,  G11B27/3027 ,  G11B2005/0029 ,  G11B2220/20

摘要： A method of enhancing the thermal stability of gray codes is disclosed. The gray code block in a servo area is recorded with a combination of two different magnetization directions. When the two different magnetization directions are expressed as “+” and “−”, the information “1” is recorded as “++−−” or “−−++” with the information “0” recorded as “+−+−” or “−+−+”. Since the filter for gray code demodulation is provided with a perpendicular recording mode, the servo area does not use long-wavelength signals that are susceptible to thermal demagnetization. As a result, thermal stability is enhanced.

公开(公告)号：US07027248B2

公开(公告)日：2006-04-11

申请号：US10633621

申请日：2003-08-05

申请人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hideki Sawaguchi

发明人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hideki Sawaguchi

IPC分类号： G11B5/02

CPC分类号： G11B5/6005 ,  G11B5/012 ,  G11B5/105 ,  G11B5/127 ,  G11B5/1272 ,  G11B5/2654 ,  G11B5/4886 ,  G11B5/56 ,  G11B2005/001 ,  G11B2005/0021

摘要： In a thermal assisted type magnetic disk apparatus having a head holding a heat element and a write element, in which coercivity of a disk is locally reduced by temperature-increasing the disk and writing is performed by the write element, along with a seek operation to move the head by a rotary actuator in a radial direction, a yaw angle is changed and a heat area and the write element are track-shifted. A mechanism to offset one of the heat area and the write element in a width direction of a slider, to array the heat element and the write element in a track running direction in correspondence with the yaw angle of the head.

摘要翻译： 在具有保持加热元件的头部和写入元件的热辅助型磁盘装置中，通过写入元件，通过写入元件执行盘的矫顽力局部减小并且进行寻道操作 通过旋转致动器在径向方向上移动头部，改变偏航角，并且对热区域和写入元件进行轨道移动。 一种抵消滑块的宽度方向上的加热区域和写入元件中的一个的机构，用于使加热元件和写入元件沿与磁头的偏航角相对应的磁道行进方向排列。