公开(公告)号：US20120300599A1

公开(公告)日：2012-11-29

申请号：US13117300

申请日：2011-05-27

申请人： John Contreras ,  Weldon Hanson ,  Barry C. Stipe ,  Rehan Zakai

发明人： John Contreras ,  Weldon Hanson ,  Barry C. Stipe ,  Rehan Zakai

IPC分类号： G11B11/00

CPC分类号： G11B5/02 ,  G11B20/1024 ,  G11B20/10351 ,  G11B2005/0021 ,  G11B2220/2516

摘要： A method and apparatus for generating a laser signal for driving a laser used in thermal-assisted recording. A channel of a hard drive generates a high-frequency component of the laser signal—e.g., a periodic wave or series of pulses—and synchronizes the phase of the laser signal with a corresponding write data signal which controls the magnetization of data bits within the magnetic disk of the hard drive. The channel may be connected to a read/write integrated circuit via a channel interconnect. The read/write circuit may include a second phase control to compensate for any phase shift and an adder circuit to combine the transmitted high-frequency laser with a DC bias. Further, the read/write circuit may include a feedback loop for adjusting the DC bias based on environmental parameters of the hard drive such as temperature.

摘要翻译： 一种用于产生用于驱动用于热辅助记录的激光的激光信号的方法和装置。 硬盘驱动器的通道产生激光信号的高频分量（例如，周期波或一系列脉冲），并将激光信号的相位与相应的写数据信号同步，该对应写数据信号控制激光信号内的数据位的磁化 硬盘的磁盘。 信道可以经由信道互连连接到读/写集成电路。 读/写电路可以包括用于补偿任何相移的第二相位控制和用于将发送的高频激光器与DC偏压组合的加法器电路。 此外，读/写电路可以包括用于基于诸如温度的硬盘驱动器的环境参数来调整DC偏置的反馈回路。

公开(公告)号：US08503125B2

公开(公告)日：2013-08-06

申请号：US13117300

申请日：2011-05-27

申请人： John Contreras ,  Weldon Hanson ,  Barry C. Stipe ,  Rehan Zakai

发明人： John Contreras ,  Weldon Hanson ,  Barry C. Stipe ,  Rehan Zakai

IPC分类号： G11B5/02

CPC分类号： G11B5/02 ,  G11B20/1024 ,  G11B20/10351 ,  G11B2005/0021 ,  G11B2220/2516

摘要： A method and apparatus for generating a laser signal for driving a laser used in thermal-assisted recording. A channel of a hard drive generates a high-frequency component of the laser signal—e.g., a periodic wave or series of pulses—and synchronizes the phase of the laser signal with a corresponding write data signal which controls the magnetization of data bits within the magnetic disk of the hard drive. The channel may be connected to a read/write integrated circuit via a channel interconnect. The read/write circuit may include a second phase control to compensate for any phase shift and an adder circuit to combine the transmitted high-frequency laser with a DC bias. Further, the read/write circuit may include a feedback loop for adjusting the DC bias based on environmental parameters of the hard drive such as temperature.

摘要翻译： 一种用于产生用于驱动用于热辅助记录的激光的激光信号的方法和装置。 硬盘驱动器的通道产生激光信号的高频分量（例如，周期波或一系列脉冲），并将激光信号的相位与相应的写数据信号同步，该对应的写数据信号控制激光信号内的数据位的磁化 硬盘的磁盘。 信道可以经由信道互连连接到读/写集成电路。 读/写电路可以包括用于补偿任何相移的第二相位控制和用于将发送的高频激光器与DC偏压组合的加法器电路。 此外，读/写电路可以包括用于基于诸如温度的硬盘驱动器的环境参数来调整DC偏置的反馈回路。

公开(公告)号：US20060195775A1

公开(公告)日：2006-08-31

申请号：US11067851

申请日：2005-02-28

申请人： Roy Cideciyan ,  Ajay Dholakia ,  Evangelos Eleftheriou ,  Richard Galbraith ,  Weldon Hanson ,  Thomas Mittelholzer ,  Travis Oenning

发明人： Roy Cideciyan ,  Ajay Dholakia ,  Evangelos Eleftheriou ,  Richard Galbraith ,  Weldon Hanson ,  Thomas Mittelholzer ,  Travis Oenning

IPC分类号： G06F11/00 ,  H03M13/00

CPC分类号： H03M13/45 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/1833 ,  G11B2020/1863 ,  H03M13/098 ,  H03M13/6343

摘要： A method and apparatus for providing a read channel having combined parity and non-parity post processing is disclosed. A post-processor combines parity and non-parity post processing to make both parity and non-parity corrections so that error events that cannot be detected by parity may be corrected. Non-parity detectable error events are only kept for consideration if their likelihood is above a set threshold.

摘要翻译： 公开了一种用于提供具有组合奇偶校验和非奇偶校验后处理的读通道的方法和装置。 后处理器组合奇偶校验和非奇偶校验后处理以进行奇偶校验和非奇偶校正，从而校正不能被奇偶校验检测到的错误事件。 只有当它们的可能性高于设定的阈值时，才能保持非奇偶校验可检测误差事件。

公开(公告)号：US07424074B2

公开(公告)日：2008-09-09

申请号：US11110187

申请日：2005-04-19

申请人： Yuan Xing Lee ,  Richard Leo Galbraith ,  Travis Oenning ,  Weldon Hanson

发明人： Yuan Xing Lee ,  Richard Leo Galbraith ,  Travis Oenning ,  Weldon Hanson

IPC分类号： H04B1/10

CPC分类号： G11B20/24 ,  G11B20/10009 ,  G11B20/10046

摘要： Embodiments of the invention provide techniques for optimizing the detector target polynomials in read/write channels to achieve the best error rate performance in recording devices. In one embodiment, a method of obtaining a detector target polynomial of a read/write channel to achieve best error rate performance in a recording device comprises: providing an initial detector target for the read/write channel; measuring a noise autocorrelation of the read/write channel at the output of equalizer using channel hardware; computing a noise autocorrelation at the output of the 1st stage target based on the measured noise autocorrelation of the read/write channel at the output of equalizer; calculating optimal coefficients for the noise whitening filter; and obtaining the optimal detector target polynomial of the read/write channel using the calculated coefficients for noise whitening filter.

摘要翻译： 本发明的实施例提供了用于优化读/写通道中的检测器目标多项式以在记录装置中实现最佳误码率性能的技术。 在一个实施例中，获得读/写通道的检测器目标多项式以在记录装置中实现最佳误码率性能的方法包括：为读/写通道提供初始检测器目标; 使用信道硬件测量均衡器输出处的读/写通道的噪声自相关; 基于在均衡器的输出处的读/写通道的测量的噪声自相关来计算第1阶段目标的输出处的噪声自相关; 计算噪声增白滤波器的最优系数; 并使用所计算的噪声增白滤波器的系数来获得读/写信道的最佳检测器目标多项式。

公开(公告)号：US20060235919A1

公开(公告)日：2006-10-19

申请号：US11110187

申请日：2005-04-19

申请人： Yuan Xing Lee ,  Richard Galbraith ,  Travis Oenning ,  Weldon Hanson

发明人： Yuan Xing Lee ,  Richard Galbraith ,  Travis Oenning ,  Weldon Hanson

IPC分类号： G06F17/15

CPC分类号： G11B20/24 ,  G11B20/10009 ,  G11B20/10046

摘要： Embodiments of the invention provide techniques for optimizing the detector target polynomials in read/write channels to achieve the best error rate performance in recording devices. In one embodiment, a method of obtaining a detector target polynomial of a read/write channel to achieve best error rate performance in a recording device comprises: providing an initial detector target for the read/write channel; measuring a noise autocorrelation of the read/write channel at the output of equalizer using channel hardware; computing a noise autocorrelation at the output of the 1st stage target based on the measured noise autocorrelation of the read/write channel at the output of equalizer; calculating optimal coefficients for the noise whitening filter; and obtaining the optimal detector target polynomial of the read/write channel using the calculated coefficients for noise whitening filter.

摘要翻译： 本发明的实施例提供了用于优化读/写通道中的检测器目标多项式以在记录装置中实现最佳误码率性能的技术。 在一个实施例中，获得读/写通道的检测器目标多项式以在记录装置中实现最佳误码率性能的方法包括：为读/写通道提供初始检测器目标; 使用信道硬件测量均衡器输出处的读/写通道的噪声自相关; 基于在均衡器的输出处的读/写通道的测量的噪声自相关来计算第1阶段目标的输出处的噪声自相关; 计算噪声增白滤波器的最优系数; 并使用所计算的噪声增白滤波器的系数来获得读/写信道的最佳检测器目标多项式。

公开(公告)号：US20050213241A1

公开(公告)日：2005-09-29

申请号：US10809230

申请日：2004-03-25

申请人： Roy Cideciyan ,  Ajay Dholakia ,  Evangelos Eleftheriou ,  Richard Galbraith ,  Weldon Hanson ,  Thomas Mittelholzer ,  Travis Oenning ,  Michael Ross ,  David Stanek

发明人： Roy Cideciyan ,  Ajay Dholakia ,  Evangelos Eleftheriou ,  Richard Galbraith ,  Weldon Hanson ,  Thomas Mittelholzer ,  Travis Oenning ,  Michael Ross ,  David Stanek

IPC分类号： G11B20/10 ,  G11B5/035 ,  G11B5/09

CPC分类号： G11B5/035

摘要： An apparatus for providing dynamic equalizer optimization is disclosed. The present invention solves the above-described problems by providing equalizer coefficient updates that converge towards the same solution as the direct method without having to first write a known pattern to the disk or requiring any prior knowledge of the data already written on the disk. The adaptive cosine function may be used to modify only a DFIR tap set, only the j and k parameters of a cosine equalizer or to modify both the tap set for a DFIR filter and the j and k parameters of the cosine equalizer. Another algorithm, such as the LMS algorithm, may be used to modify parameters not modified by the cosine algorithm.

摘要翻译： 公开了一种用于提供动态均衡器优化的装置。 本发明通过提供均衡器系数更新来解决上述问题，所述均衡器系数更新收敛于与直接方法相同的解决方案，而不必首先将已知模式写入盘或需要任何已经写入盘中的数据的任何知识。 自适应余弦函数可用于仅修改DFIR抽头集，仅修改余弦均衡器的j和k参数，或者修改DFIR滤波器的抽头集合和余弦均衡器的j和k参数。 可以使用诸如LMS算法的另一种算法来修改未被余弦算法修改的参数。

公开(公告)号：US20050138518A1

公开(公告)日：2005-06-23

申请号：US10739966

申请日：2003-12-18

申请人： Roy Cideciyan ,  Ajay Dholakia ,  Evangelos Eleftheriou ,  Richard Galbraith ,  Weldon Hanson ,  Thomas Mittelholzer ,  Travis Oenning

发明人： Roy Cideciyan ,  Ajay Dholakia ,  Evangelos Eleftheriou ,  Richard Galbraith ,  Weldon Hanson ,  Thomas Mittelholzer ,  Travis Oenning

IPC分类号： G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  H03M13/00

CPC分类号： G11B20/1833

摘要： A data storage system includes an encoder subsystem comprising an error correction code encoder, a modulation encoder, and a precoder, and a decoder subsystem similarly comprising a detector, an inverse precoder, a channel decoder, and an error correction code decoder. The error correction encoder applies an error correction code to the incoming user bit stream, and the modulation encoder applies so-called modulation or constrained coding to the error correction coded bit stream. The precoder applies so-called precoding to the modulation encoded bit stream. However, this precoding is applied to selected portions of the bit stream only. There can also be a permutation step where the bit sequence is permuted after the modulation encoder before precoding is applied by the precoder. The decoder subsystem operates in the inverse manner.

摘要翻译： 数据存储系统包括编码器子系统，包括纠错码编码器，调制编码器和预编码器，以及类似地包括检测器，逆预编码器，信道解码器和纠错码解码器的解码器子系统。 误差校正编码器对输入用户比特流应用纠错码，并且调制编码器将所谓的调制或约束编码应用于纠错编码比特流。 预编码器将所谓的预编码应用于调制编码比特流。 然而，该预编码仅应用于位流的选定部分。 还可以存在一个置换步骤，其中在由预编码器施加预编码之前，该位序列在调制编码器之后被置换。 解码器子系统以相反的方式运行。