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    Filtering a read signal to attenuate secondary pulses caused by pole tips of a thin film magnetic read head
    1.
    发明授权
    Filtering a read signal to attenuate secondary pulses caused by pole tips of a thin film magnetic read head 失效
    滤除读取信号以衰减由薄膜磁头读取头的极尖引起的次脉冲

    公开(公告)号：US5623377A

    公开(公告)日：1997-04-22

    申请号：US222666

    申请日：1994-04-04

    申请人： Richard T. Behrens ,  Neal Glover ,  Trent O. Dudley ,  Alan J. Armstrong ,  Christopher P. Zook ,  William G. Bliss

    发明人： Richard T. Behrens ,  Neal Glover ,  Trent O. Dudley ,  Alan J. Armstrong ,  Christopher P. Zook ,  William G. Bliss

    IPC分类号： G11B5/09 ,  G11B20/10 ,  H03H17/02 ,  H03H17/06 ,  H04B3/06 ,  G11B5/035

    CPC分类号： H03H17/06 ,  G11B20/10009 ,  G11B5/09 ,  H03H17/02

    摘要： A filter for compensating discrete secondary pulse formations associated with a data stream of discrete main pulses produced from data read from magnetic media. The filter's impulse response comprises a center coefficient with side compensating coefficients for attenuating the secondary pulses when the input signal is convolved with the impulse response. The magnitude and delay of the compensation coefficients are programmable and are adaptively adjusted to optimize the impulse response for a given environment. In a traditional FIR embodiment, two delay lines are used to generate the two programmable delays between the center coefficient and side compensation coefficients. In the preferred embodiment, an IIR filter provides the two programmable delays using only one delay line thereby reducing the size and cost of the circuit. Also in the preferred embodiment, the data stream is interleaved into an even and odd data stream and processed in parallel by two filters in order to double the throughput. Further, the pre-cursor correcting portion of the filter can be disabled in order to avoid delaying the data stream while still canceling the post-cursor secondary pulses. The filter also comprises attenuation and adder means to match the coincident sample values in amplitude and add them to substantially eliminate the effect of the secondary pulses in the discrete data stream.

    摘要翻译： 用于补偿与从磁介质读取的数据产生的离散主脉冲的数据流相关联的离散次级脉冲形成的滤波器。 滤波器的脉冲响应包括具有侧补偿系数的中心系数，用于当输入信号与脉冲响应卷积时衰减次级脉冲。 补偿系数的幅度和延迟可编程，并进行自适应调整，以优化给定环境的脉冲响应。 在传统的FIR实施例中，使用两条延迟线来产生中心系数和侧面补偿系数之间的两个可编程延迟。 在优选实施例中，IIR滤波器仅使用一个延迟线提供两个可编程延迟，从而减小电路的尺寸和成本。 同样在优选实施例中，数据流被交织成偶数和奇数数据流，并且由两个滤波器并行处理，以使吞吐量翻倍。 此外，可以禁用滤波器的前光标校正部分，以避免在仍然取消后光标次级脉冲的同时延迟数据流。 滤波器还包括衰减和加法器装置，以使幅度上重合的采样值相匹配，并将它们相加，以基本上消除离散数据流中次级脉冲的影响。

    Disk storage system employing error detection and correction of channel coded data, interpolated timing recovery, and retroactive/split-segment symbol synchronization
    4.
    发明授权
    Disk storage system employing error detection and correction of channel coded data, interpolated timing recovery, and retroactive/split-segment symbol synchronization 失效
    磁盘存储系统采用通道编码数据的错误检测和校正，内插定时恢复和追溯/分段符号同步

    公开(公告)号：US6009549A

    公开(公告)日：1999-12-28

    申请号：US856885

    申请日：1997-05-15

    申请人： William G. Bliss ,  Christopher P. Zook ,  Richard T. Behrens

    发明人： William G. Bliss ,  Christopher P. Zook ,  Richard T. Behrens

    IPC分类号： G11B5/012 ,  G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  G11B27/30 ,  C11C29/00 ,  G11B5/09

    CPC分类号： G11B20/10055 ,  G11B20/10009 ,  G11B20/1426 ,  G11B20/1833 ,  G11B27/3027 ,  G11B2020/1476 ,  G11B5/012

    摘要： A disk storage system is disclosed wherein user data received from a host system is first encoded according to a first channel code having a high code rate, and then encoded according to an ECC code, such as a Reed-Solomon code, wherein the ECC redundancy symbols are encoded according to a second channel code having low error propagation. In the preferred embodiment, the first channel code is a RLL (d,k) code having a long k constraint which allows for longer block lengths (and higher code rates). During read back, a synchronous read channel samples the analog read signal a synchronously and interpolates the asynchronous sample values to generate sample values substantially synchronized to the baud rate. In contrast to conventional synchronous-sampling timing recovery, interpolated timing recovery can tolerate a longer RLL k constraint because it is less sensitive to noise in the read signal and not affected by process variations in fabrication. Additionally, a trellis sequence detector detects an estimated binary sequence from the synchronous sample values, wherein a state transition diagram of the trellis detector is configured according to the code constraints of the first and second channel codes. The estimated binary sequence output by the sequence detector is buffered in a data buffer to facilitate the error detection and correction process, and to allow for retroactive and split-segment symbol synchronization using multiple sync marks.

    摘要翻译： 公开了一种磁盘存储系统，其中根据具有高码率的第一信道码首先对从主机系统接收的用户数据进行编码，然后根据诸如Reed-Solomon码的ECC码进行编码，其中ECC冗余 符号根据具有低误差传播的第二信道码进行编码。 在优选实施例中，第一信道码是具有长k约束的RLL（d，k）码，其允许更长的码块长度（和较高码率）。 在读回期间，同步读通道同步地对模拟读取信号进行采样，并内插异步采样值，以生成基本上与波特率同步的采样值。 与传统的同步采样定时恢复相比，内插定时恢复可以容忍较长的RLL k约束，因为它对读取信号中的噪声不太敏感，并且不受制造过程变化的影响。 另外，网格序列检测器根据同步采样值检测估计的二进制序列，其中根据第一和第二信道码的编码约束配置网格检测器的状态转移图。 由序列检测器输出的估计的二进制序列被缓冲在数据缓冲器中，以便于错误检测和校正过程，并允许使用多个同步标记进行追溯和分段符号同步。

    Adaptive equalization and interpolated timing recovery in a sampled amplitude read channel for magnetic recording
    6.
    发明授权
    Adaptive equalization and interpolated timing recovery in a sampled amplitude read channel for magnetic recording 失效
    用于磁记录的采样振幅读通道中的自适应均衡和内插定时恢复

    公开(公告)号：US06819514B1

    公开(公告)日：2004-11-16

    申请号：US08640351

    申请日：1996-04-30

    申请人： Richard T. Behrens ,  Li Du ,  William G. Bliss ,  David E. Reed ,  Mark S. Spurbeck

    发明人： Richard T. Behrens ,  Li Du ,  William G. Bliss ,  David E. Reed ,  Mark S. Spurbeck

    IPC分类号： G11B5035

    CPC分类号： G11B20/10194 ,  G11B20/10037 ,  G11B20/10055 ,  G11B20/1258 ,  G11B20/1876

    摘要： A sampled amplitude read channel for magnetic disk recording which asynchronously samples the analog read signal, adaptively equalizes the resulting discrete time sample values according to a target partial response, extracts synchronous sample values through interpolated timing recovery, and detects digital data from the synchronous sample values using a Viterbi sequence detector is disclosed. To minimize interference from the timing and gain control loops, the phase and magnitude response of the adaptive equalizer filter are constrained at a predetermined frequency using an optimal orthogonal projection operation as a modification to a least mean square (LMS) adaptation algorithm. Further, with interpolated timing recovery, the equalizer filter and its associated latency are removed from the timing recovery loop, thereby allowing a higher order discrete time filter and a lower order analog filter.

    摘要翻译： 用于磁盘记录的采样幅度读取通道，其异步采样模拟读取信号，根据目标部分响应对所得离散时间采样值进行自适应均衡，通过内插定时恢复提取同步采样值，并从同步采样值检测数字数据 公开了使用维特比序列检测器。 为了最小化来自定时和增益控制环路的干扰，使用最佳正交投影操作将自适应均衡器滤波器的相位和幅度响应约束在预定频率，作为对最小均方（LMS）适配算法的修改。 此外，通过内插定时恢复，均衡器滤波器及其相关等待时间从定时恢复环路中移除，从而允许较高阶离散时间滤波器和较低阶模拟滤波器。

    Sampled amplitude read channel employing interpolated timing recovery and a remod/demod sequence detector
    7.
    发明授权
    Sampled amplitude read channel employing interpolated timing recovery and a remod/demod sequence detector 失效
    采用内插定时恢复的采样幅度读取通道和重构/解调序列检测器

    公开(公告)号：US5771127A

    公开(公告)日：1998-06-23

    申请号：US681678

    申请日：1996-07-29

    申请人： David E. Reed ,  William R. Foland, Jr. ,  William G. Bliss ,  Richard T. Behrens ,  Lisa C. Sundell

    发明人： David E. Reed ,  William R. Foland, Jr. ,  William G. Bliss ,  Richard T. Behrens ,  Lisa C. Sundell

    IPC分类号： G11B20/10 ,  G11B20/14 ,  G11B5/09

    CPC分类号： G11B20/10055 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/1426

    摘要： In a computer disk storage system for recording binary data, a sampled amplitude read channel comprises a sampling device for asynchronously sampling pulses in an analog read signal from a read head positioned over a disk storage medium, interpolated timing recovery for generating synchronous sample values, and a sequence detector for detecting the binary data from the synchronous sample values. The sequence detector comprises a demodulator for detecting a preliminary binary sequence which may contain bit errors, a remodulator for remodulating to estimated sample values, a means for generating sample error values, an error pattern detector for detecting the bit errors, an error detection validator, and an error corrector for correcting the bit errors. The remodulator comprises a partial erasure circuit which compensates for the non-linear reduction in amplitude of a primary pulse caused by secondary pulses located near the primary pulse. The error pattern detector comprises a peak error pattern detector and, if an error pattern is detected, a means for disabling the error pattern detector until the detected error pattern has been fully processed. The error detection validator checks the validity of a detected error event and, if valid, enables operation of the error corrector.

    摘要翻译： 在用于记录二进制数据的计算机磁盘存储系统中，采样幅度读取通道包括用于从位于盘存储介质上的读取头的模拟读取信号中异步采样脉冲的采样装置，用于产生同步采样值的内插定时恢复，以及 序列检测器，用于从同步样本值检测二进制数据。 序列检测器包括用于检测可能包含位错误的初步二进制序列的解调器，用于重新调制到估计样本值的再调制器，用于产生采样误差值的装置，用于检测位错误的误差模式检测器，错误检测验证器， 以及用于校正位错误的纠错器。 再调制器包括部分擦除电路，其补偿由位于主脉冲附近的次级脉冲引起的初级脉冲的幅度的非线性减小。 误差模式检测器包括峰值误差模式检测器，并且如果检测到错误模式，则用于禁止错误模式检测器的装置，直到检测到的错误模式被完全处理为止。 错误检测验证器检查检测到的错误事件的有效性，如果有效，则允许错误校正器的操作。

    Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording
    8.
    发明授权
    Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording 有权
    用于磁记录的采样振幅读通道中的增益和相位约束自适应均衡滤波器

    公开(公告)号：US06208481B1

    公开(公告)日：2001-03-27

    申请号：US09342167

    申请日：1999-06-28

    申请人： Mark S. Spurbeck ,  Li Du ,  Trent O. Dudley ,  William G. Bliss ,  German S. Feyh ,  Richard T. Behrens

    发明人： Mark S. Spurbeck ,  Li Du ,  Trent O. Dudley ,  William G. Bliss ,  German S. Feyh ,  Richard T. Behrens

    IPC分类号： G11B5035

    CPC分类号： G11B20/10055 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/1403 ,  H04L7/0029 ,  H04L7/0062

    摘要： A sampled amplitude read channel for magnetic disk recording which asynchronously samples the analog read signal, adaptively equalizes the resulting discrete time sample values according to a target partial response, extracts synchronous sample values through interpolated timing recovery, and detects digital data from the synchronous sample values using a Viterbi sequence detector is disclosed. To minimize interference from the timing and gain control loops, the phase and magnitude response of the adaptive equalizer filter are constrained at a predetermined frequency using an optimal orthogonal projection operation as a modification to a least mean square (LMS) adaptation algorithm. Further, with interpolated timing recovery, the equalizer filter and its associated latency are removed from the timing recovery loop, thereby allowing a higher order discrete time filter and a lower order analog filter.

    摘要翻译： 用于磁盘记录的采样幅度读取通道，其异步采样模拟读取信号，根据目标部分响应对所得离散时间采样值进行自适应均衡，通过内插定时恢复提取同步采样值，并从同步采样值检测数字数据 公开了使用维特比序列检测器。 为了最小化来自定时和增益控制环路的干扰，使用最佳正交投影操作将自适应均衡器滤波器的相位和幅度响应约束在预定频率，作为对最小均方（LMS）适配算法的修改。 此外，通过内插定时恢复，均衡器滤波器及其相关等待时间从定时恢复环路中移除，从而允许较高阶离散时间滤波器和较低阶模拟滤波器。