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1. 发明授权

US5771127A Sampled amplitude read channel employing interpolated timing recovery and a remod/demod sequence detector 失效
标题翻译：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。

2. 发明授权

US5987634A Channel quality circuit in a sampled amplitude read channel 失效
标题翻译：通道质量电路采样振幅读通道
公开(公告)号：US5987634A
公开(公告)日：1999-11-16
申请号：US897339
申请日：1997-07-21
申请人： Richard T. Behrens , William G. Bliss , William R. Foland, Jr.
发明人： Richard T. Behrens , William G. Bliss , William R. Foland, Jr.
IPC分类号： G11B20/10 , G11C29/00
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037
摘要： A channel quality circuit, incorporated within a sampled amplitude read channel utilized in a magnetic storage system, for processing and accumulating performance data from the individual read channel components, wherein the performance data is used to calibrate the read channel to operate in a particular environment, to estimate the bit error rate of the storage system, and to detect defects in the magnetic medium. The channel quality circuit generates a test pattern of digital data which is written to the storage system. Then, as the test pattern is read from the storage system, the channel quality circuit accumulates performance data from the read channel components. The test pattern is used to generate expected samples and expected sample errors relative to the samples read by the read channel. Gating logic is programmed to accumulate only the particular performance data of interest. The channel quality circuit computes auto and cross-correlations, squared errors, and threshold comparisons. A defect detection filter detects particular defects in the media. In order to predict the bit error rate of the storage system, the channel quality circuit accumulates noise auto-correlation data, confidence metrics from a sequence detector, and cross-correlation of expected sample errors with actual sample errors.
摘要翻译：一种信道质量电路，其被并入在磁存储系统中使用的采样幅度读取信道中，用于处理和累积来自各个读取信道分量的性能数据，其中，所述性能数据用于校准所述读取信道以在特定环境中操作，估计存储系统的误码率，并检测磁介质中的缺陷。信道质量电路产生写入存储系统的数字数据的测试模式。然后，当从存储系统读取测试图案时，信道质量电路从读取的信道分量累积性能数据。测试模式用于产生相对于读通道读取的样本的预期样本和预期样本误差。门控逻辑被编程为仅累积感兴趣的特定性能数据。信道质量电路计算自动和互相关，平方误差和阈值比较。缺陷检测滤波器检测介质中的特定缺陷。为了预测存储系统的误码率，信道质量电路将噪声自相关数据，序列检测器的置信度量度以及预期样本误差与实际样本误差的互相关累积。

3. 发明授权

US06819514B1 Adaptive equalization and interpolated timing recovery in a sampled amplitude read channel for magnetic recording 失效
标题翻译：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。

4. 发明授权

US6108151A Sampled amplitude read channel for reading user data and embedded servo data from a magnetic medium 失效
标题翻译：采样幅度读通道，用于从磁介质读取用户数据和嵌入式伺服数据
公开(公告)号：US6108151A
公开(公告)日：2000-08-22
申请号：US846140
申请日：1997-04-25
申请人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
发明人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
IPC分类号： G11B5/012 , G11B5/09 , G11B5/55 , G11B5/58 , G11B5/596 , G11B19/28 , G11B20/10 , G11B20/12 , G11B20/14 , G11B15/12 , G11B21/02
CPC分类号： G11B20/10055 , G11B19/28 , G11B20/10009 , G11B20/10037 , G11B20/1403 , G11B5/012 , G11B5/09 , G11B5/5526 , G11B5/553 , G11B5/5547 , G11B5/58 , G11B5/59605 , G11B5/59622 , G11B5/59633 , G11B5/59688 , G11B20/1258 , G11B5/5534 , G11B5/5965
摘要： A sampled amplitude read channel is disclosed for reading data recorded on a disk storage medium by detecting an estimated binary sequence from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a read head positioned over the disk storage medium. The read channel comprises a sampling device, such as an analog-to-digital converter (A/D), for sampling the analog read signal to generate the discrete time sample values and for sampling at least one other auxillary analog input signal, such as a servo control signal. In this manner, performance characteristics of the read channel can be measured, such as the driving current applied to the servo control voice coil motor (VCM), without requiring additional hardware.
摘要翻译：公开了一种采样幅度读取通道，用于通过从位于盘存储介质上的读取头的模拟读取信号中通过采样脉冲产生的离散时间采样值序列检测估计的二进制序列来读取记录在盘存储介质上的数据。读取通道包括采样装置，例如模拟 - 数字转换器（A / D），用于对模拟读取信号进行采样以产生离散时间采样值，并用于对至少一个其他辅助模拟输入信号进行采样，例如伺服控制信号。以这种方式，可以测量读取通道的性能特性，例如施加到伺服控制音圈电机（VCM）的驱动电流，而不需要额外的硬件。

5. 发明授权

US06208481B1 Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording 有权
标题翻译：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。

6. 发明授权

US5623377A Filtering a read signal to attenuate secondary pulses caused by pole tips of a thin film magnetic read head 失效
标题翻译：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。

7. 发明授权

US5999355A Gain and phase constrained adaptive equalizing filter in a sampled amplitude read channel for magnetic recording 失效
标题翻译：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：US5999355A
公开(公告)日：1999-12-07
申请号：US640410
申请日：1996-04-30
申请人： Richard T. Behrens , William G. Bliss , Li Du , Mark S. Spurbeck , German S. Feyh , Trent O. Dudley
发明人： Richard T. Behrens , William G. Bliss , Li Du , Mark S. Spurbeck , German S. Feyh , Trent O. Dudley
IPC分类号： G11B5/012 , G11B5/035 , G11B5/09 , G11B20/10 , G11B20/14 , G11B20/18 , H03H15/00 , H03H17/02 , H03H17/06 , H04L7/00 , H04L7/02 , H04L25/03
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B20/1403 , G11B5/09 , G11B5/012 , G11B5/035 , 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。

8. 发明授权

US5796535A Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer 失效
标题翻译：采用用户数据频率合成器和伺服数据频率合成器的采样幅度读取通道
公开(公告)号：US5796535A
公开(公告)日：1998-08-18
申请号：US440515
申请日：1995-05-12
申请人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
发明人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
IPC分类号： G11B5/012 , G11B5/09 , G11B5/55 , G11B5/58 , G11B5/596 , G11B19/28 , G11B20/10 , G11B20/12 , G11B20/14
CPC分类号： G11B20/10055 , G11B19/28 , G11B20/10009 , G11B20/10037 , G11B20/1403 , G11B5/012 , G11B5/09 , G11B5/5526 , G11B5/553 , G11B5/5547 , G11B5/58 , G11B5/59605 , G11B5/59622 , G11B5/59633 , G11B5/59688 , G11B20/1258 , G11B5/5534 , G11B5/5965
摘要： A sampled amplitude read channel incorporated within a magnetic disk storage system for reading data recorded in concentric tracks on a magnetic medium, where the data comprises user data sectors recorded at varying data rates across a plurality of predefined zones and embedded servo data sectors recorded at the same data rate across the zones. The sampled amplitude read channel comprises a timing recovery component for synchronous sampling of a read signal from a magnetic read head positioned over the magnetic medium, a gain control component for adjusting the amplitude of the read signal, and a DC offset component for cancelling a DC offset in the read signal. These components are dynamically configured to operate according to whether the read channel is processing user data or embedded servo data. A user data frequency synthesizer and a servo data frequency synthesizer lock the timing recovery component to a reference frequency and provide a coarse center frequency control signal corresponding to the user data or servo data mode. The read channel further employs pipelined reads to reduce the physical gap between sectors on the medium. In addition, an improved sync mark detector and an improved asynchronous servo address mark detector increase the accuracy and reliability of the read channel.
摘要翻译：一个结合在磁盘存储系统内的采样幅度读取通道，用于读取记录在磁介质上的同心磁道中的数据，其中数据包括以多个预定义区域中记录的不同数据速率记录的用户数据扇区，以及记录在相同的数据速率跨区域。采样振幅读通道包括定时恢复组件，用于对位于磁介质上的磁读头进行读信号的同步采样，用于调整读信号振幅的增益控制部件和用于消除DC的直流偏移分量在读信号中偏移。这些组件被动态配置为根据读通道是处理用户数据还是嵌入式伺服数据进行操作。用户数据频率合成器和伺服数据频率合成器将定时恢复组件锁定到参考频率，并提供对应于用户数据或伺服数据模式的粗略的中心频率控制信号。读通道还采用流水线读取来减少介质上扇区之间的物理差距。此外，改进的同步标记检测器和改进的异步伺服地址标记检测器增加读取通道的精度和可靠性。

9. 发明授权

US5754352A Synchronous read channel employing an expected sample value generator for acquiring a preamble 失效
标题翻译：采用预期采样值发生器的同步读通道用于获取前导码
公开(公告)号：US5754352A
公开(公告)日：1998-05-19
申请号：US701572
申请日：1996-08-22
申请人： Richard T. Behrens , Trent Dudley , William G. Bliss
发明人： Richard T. Behrens , Trent Dudley , William G. Bliss
IPC分类号： G11B20/10 , G11B20/14 , H03L7/085 , H03L7/091 , H04L7/02 , H04L7/033 , H04L7/10 , G11B5/09
CPC分类号： H04L7/0062 , G11B20/10009 , G11B20/10055 , G11B20/1403 , H03L7/085 , H03L7/091 , H04L7/0334 , H04L7/10
摘要： An improved timing recovery phase-locked loop in a partial response recording channel comprising a means for generating a frequency error and a means for generating a phase error represented by a timing gradient. The frequency error is not affected by a DC offset in the input reference signal and is less susciptible to noise due to an increase in sensitivity. A state machine for generating expected samples is used to generate the timing gradient, rather than estimated signal samples, which results in a shorter acquisition preamble. When tracking arbitrary user data, the timing gradient is smoothed to reduce variations in the gain of the loop.
摘要翻译：部分响应记录通道中的改进的定时恢复锁相环，包括用于产生频率误差的装置和用于产生由定时梯度表示的相位误差的装置。频率误差不受输入参考信号中的直流偏移影响，并且由于灵敏度的增加而对噪声不太敏感。用于产生预期样本的状态机用于产生定时梯度，而不是估计的信号样本，这导致较短的采集前导码。当跟踪任意用户数据时，平滑定时梯度以减少环路增益的变化。

10. 发明授权

US06646822B1 Sampled amplitude read channel employing pipelined reads to reduce the gap between sectors 失效
标题翻译：取样幅度读通道采用流水线读数，以减少扇区之间的差距
公开(公告)号：US06646822B1
公开(公告)日：2003-11-11
申请号：US08815894
申请日：1997-03-12
申请人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
发明人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
IPC分类号： G11B509
CPC分类号： G11B20/10055 , G11B5/012 , G11B5/09 , G11B5/5526 , G11B5/553 , G11B5/5534 , G11B5/5547 , G11B5/58 , G11B5/59605 , G11B5/59622 , G11B5/59633 , G11B5/5965 , G11B5/59688 , G11B19/28 , G11B20/10009 , G11B20/10037 , G11B20/1258 , G11B20/1403
摘要： A sampled amplitude read channel incorporated within a magnetic disk storage system for reading data recorded tracks on a magnetic medium, where the data comprises user data sectors recorded at varying data rates across a plurality of predefined zones and embedded servo data sectors recorded at the same data rate across the zones. The read channel comprises a timing recovery component for synchronous sampling of a read signal from a magnetic read head positioned over the magnetic medium, a gain control component for adjusting the amplitude of the read signal, and a DC offset component for canceling a DC offset in the read signal. These components are dynamically configured to operate according to whether the read channel is processing user data or embedded servo data.
摘要翻译：包含在磁盘存储系统内的采样幅度读取通道，用于读取在磁性介质上记录的轨道上的数据，其中数据包括以相同数据记录的多个预定义区域和嵌入式伺服数据扇区以变化的数据速率记录的用户数据扇区率跨越区域。读取通道包括用于对位于磁介质上的磁读头的读信号进行同步采样的定时恢复组件，用于调整读信号幅度的增益控制部件和用于消除读信号的DC偏移的DC偏移分量读信号。这些组件被动态配置为根据读通道是处理用户数据还是嵌入式伺服数据进行操作。

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