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1. 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。

2. 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。

3. 发明授权

US6009549A Disk storage system employing error detection and correction of channel coded data, interpolated timing recovery, and retroactive/split-segment symbol synchronization 失效
标题翻译：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。

4. 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。

5. 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。

6. 发明授权

US5729396A Fault tolerant sync mark detector enabled relative to a frequency of an acquisition preamble for sampled amplitude recording 失效
标题翻译：容错同步标记检测器相对于采样幅度记录的采集前导码的频率启用
公开(公告)号：US5729396A
公开(公告)日：1998-03-17
申请号：US440268
申请日：1995-05-12
申请人： Trent O. Dudley , Richard T. Behrens , Christopher P. Zook
发明人： Trent O. Dudley , Richard T. Behrens , Christopher P. Zook
IPC分类号： G11B5/012 , G11B20/10 , G11B20/14 , G11B27/30 , G11B5/09
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B20/1403 , G11B27/30 , G11B27/3027 , G11B5/012 , G11B2020/1476
摘要： A sampled amplitude read channel reads data from a magnetic medium by detecting digital data from a sequence of discrete time sample values generated by sampling an analog read signal from a read head positioned over the magnetic medium. The digital data comprises a preamble field followed by a sync mark followed by a data field. Timing recovery in the read channel synchronizes to a phase and frequency of the preamble field and a sync detector detects the sync mark in order to frame operation of an RLL decoder for decoding the detected data field. To decrease the probability of early misdetection, the sync mark is chosen to have minimum correlation with shifted versions of the sync mark concatenated with the preamble field. To further increase the fault tolerance, the sync mark detector is enabled by timing recovery relative to the end of the preamble field. A state machine in timing recovery generates expected sample values used to acquire the preamble field, and a current state of the state machine indicates when the preamble ends relative to a predetermined clock interval. In this manner, the search for an appropriate sync mark need only look for minimum correlation during shifts at the predetermined clock interval, thereby increasing the fault tolerant characteristic of the sync mark.
摘要翻译：采样幅度读取通道从通过从位于磁性介质上的读取头采样模拟读取信号而产生的离散时间采样值的序列中检测数字数据，从磁性介质读取数据。数字数据包括前同步码字段，随后是同步标记，后跟数据字段。读通道中的定时恢复与前同步码字段的相位和频率同步，并且同步检测器检测同步标记，以便对RLL解码器进行帧操作，以对检测到的数据字段进行解码。为了降低早期错误检测的可能性，选择同步标记与与前同步码字段连接的同步标记的移位版本具有最小相关性。为了进一步增加容错能力，同步标记检测器通过相对于前同步码字段结束的定时恢复来启用。定时恢复中的状态机产生用于获取前导字段的预期采样值，并且状态机的当前状态指示前导码相对于预定时钟间隔何时结束。以这种方式，搜索适当的同步标记仅需要在预定时钟间隔期间寻找在移位期间的最小相关性，从而增加同步标记的容错特性。

7. 发明授权

US6005727A Servo decoder for decoding an error correcting servo code recorded on a disc storage medium 失效
标题翻译：伺服解码器，用于解码记录在盘存储介质上的纠错伺服码
公开(公告)号：US6005727A
公开(公告)日：1999-12-21
申请号：US790038
申请日：1997-01-28
申请人： Richard T. Behrens , Christopher P. Zook , David E. Reed , Stephen A. Turk
发明人： Richard T. Behrens , Christopher P. Zook , David E. Reed , Stephen A. Turk
IPC分类号： G11B5/55 , G11B5/596 , G11B7/007 , G11B21/08 , G11B21/10 , G11B27/30 , G11B5/09
CPC分类号： G11B7/00745 , G11B21/083 , G11B21/106 , G11B27/3027 , G11B5/553 , G11B5/59655 , G11B5/59688 , G11B5/5547
摘要： A servo decoder is disclosed for disc storage systems that operates according to a novel coding scheme capable of accurately decoding detected codewords representing servo track address during seek operations, even when the recording head flies between two adjacent tracks, and capable of correcting errors in the detected codedwords caused by noise in the read signal, such as inter-symbol interference. In a first embodiment, the coding scheme comprises an error correcting code (ECC) capable of correcting a predetermined number of bit errors in the detected codewords. To achieve the equivalent effect of a conventional Gray code, the codewords are arranged such that adjacent track addresses differ by a number of bits equal to the minimum distance of the ECC code. In a second embodiment, the servo code corrects certain minimum distance error events associated with a trellis type sequence detector. To achieve the equivalent effect of a conventional Gray code in this embodiment, the codewords are arranged such that adjacent track addresses differ by a number of bits relative to the minimum distance error events corrected. In this manner, when the recording head spans two adjacent tracks during a seek operation, the ambiguity in the detected codeword will be resolved in favor of one of the adjacent track addresses. Further, due to the error correcting capabilities of the code, the present invention improves the performance of servo seeking and tracking operations, and allows the servo data to be recorded at a higher density.
摘要翻译：公开了一种用于盘存储系统的伺服解码器，该盘存储系统根据能够在搜索操作期间精确地解码表示伺服轨迹地址的检测码字的新型编码方案进行操作，即使当记录头在两个相邻的轨道之间飞行时，也能够校正检测到的错误读取信号中由噪声引起的编码字，如符号间干扰。在第一实施例中，编码方案包括能够校正检测码字中预定数量的位错误的纠错码（ECC）。为了实现常规格雷码的等效效果，码字被布置成使得相邻轨道地址与等于ECC码的最小距离的位数相差。在第二实施例中，伺服代码校正与网格型序列检测器相关联的某些最小距离误差事件。为了实现本实施例中常规格雷码的等效效果，码字被布置成使得相邻轨道地址相对于校正的最小距离误差事件相差多个位。以这种方式，当在搜索操作期间记录头跨越两个相邻轨道时，检测到的码字中的模糊度将被解析为有利于相邻轨道地址之一。此外，由于代码的纠错能力，本发明提高了伺服寻找和跟踪操作的性能，并允许以更高的密度记录伺服数据。

8. 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。

9. 发明授权

US5903857A Method and apparatus for calibrating an analog filter in a sampled amplitude read channel 失效
标题翻译：用于校准采样振幅读通道中的模拟滤波器的方法和装置
公开(公告)号：US5903857A
公开(公告)日：1999-05-11
申请号：US751832
申请日：1996-11-18
申请人： Richard T. Behrens , Tyson Tuttle , Kent D. Anderson , Trent O. Dudley , William G. Bliss
发明人： Richard T. Behrens , Tyson Tuttle , Kent D. Anderson , Trent O. Dudley , William G. Bliss
IPC分类号： G11B20/10 , G06F17/10 , G11B5/035
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B20/10481
摘要： A method and apparatus for calibrating an analog equalizer in a sampled amplitude read channel is disclosed wherein the filter's frequency response is measured and calibrated directly. This is accomplished by injecting a known periodic signal into the analog filter and measuring a spectrum value at a predetermined frequency. The filter parameters are adjusted accordingly until the spectrum reaches a predetermined target value. In the preferred embodiment, the analog filter comprises at least one second order low pass filter (referred to as a biquad filter), and the filter's spectrum is adjusted relative to the well known parameters f.sub.o and Q. Specifically, the parameters f.sub.o and Q are optimized relative to a power measurement at predetermined harmonics of the input signal. In this manner, the present invention enables auto-calibration of the analog equalizer without reading any data from the disc. Furthermore, the calibration process can be executed during the storage system's normal operation without significantly degrading its overall performance.
摘要翻译：公开了一种用于校准采样振幅读通道中的模拟均衡器的方法和装置，其中滤波器的频率响应被直接测量和校准。这是通过将已知的周期信号注入模拟滤波器并以预定频率测量频谱值来实现的。相应地调整滤波器参数，直到频谱达到预定的目标值。在优选实施例中，模拟滤波器包括至少一个二阶低通滤波器（称为双二阶滤波器），并且相对于众所周知的参数fo和Q调节滤波器的频谱。具体地，参数fo和Q是相对于输入信号的预定谐波处的功率测量而优化。以这种方式，本发明能够在不从盘读取任何数据的情况下自动校准模拟均衡器。此外，可以在存储系统的正常操作期间执行校准过程，而不会显着降低其整体性能。

10. 发明授权

US5802118A Sub-sampled discrete time read channel for computer storage systems 失效
标题翻译：用于计算机存储系统的子采样离散时间读通道
公开(公告)号：US5802118A
公开(公告)日：1998-09-01
申请号：US681578
申请日：1996-07-29
申请人： William G. Bliss , David E. Reed , Richard T. Behrens
发明人： William G. Bliss , David E. Reed , Richard T. Behrens
IPC分类号： G11B20/10 , G11B20/14 , H04B1/10
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B20/1426
摘要： A sampled amplitude read channel is disclosed for reading binary data from a computer disk storage system, wherein the read channel sub-samples an analog read signal at a rate lower than the baud rate and detects the binary data from the sub-sampled values using a sequence detector. In one embodiment, the sub-sampled values are interpolated to generate synchronous sample values which are processed by a conventional sequence detector. In another embodiment, the sequence detector is modified to detect the binary data directly from the sub-sampled values. In yet another embodiment, the sequence detector comprises a remodulator and an error pattern detector for detecting and correcting bit errors in the detected binary data. In addition, for the various embodiments a channel code increases the distance property of the sequence detector in order to compensate for the degradation in performance caused by sub-sampling.
摘要翻译：公开了一种用于从计算机磁盘存储系统读取二进制数据的采样幅度读取通道，其中读取通道以低于波特率的速率对模拟读取信号进行子采样，并使用以下方式从子采样值检测二进制数据：序列检测器。在一个实施例中，子采样值被内插以产生由常规序列检测器处理的同步采样值。在另一个实施例中，修改序列检测器以直接从子采样值检测二进制数据。在另一个实施例中，序列检测器包括重调制器和用于检测和校正检测到的二进制数据中的比特错误的错误模式检测器。此外，对于各种实施例，信道码增加了序列检测器的距离特性，以便补偿由次采样引起的性能下降。

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