专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US06345074B1 Maximum likelihood servo detector for detecting an error correcting servo code recorded on a disc storage medium 失效
标题翻译：用于检测记录在盘存储介质上的纠错伺服码的最大似然伺服检测器
公开(公告)号：US06345074B1
公开(公告)日：2002-02-05
申请号：US09045612
申请日：1998-03-20
申请人： Stephen A. Turk , David E. Reed , Richard T. Behrens
发明人： Stephen A. Turk , David E. Reed , Richard T. Behrens
IPC分类号： H03D100
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B20/1426 , G11B20/1866 , G11B2020/10916 , H04L1/0054
摘要： A disc storage system servo code detector is disclosed that provides enhanced error correction capabilities during both tracking and seeking by increasing a minimum distance dmin between valid codewords and by increasing a minimum distance {circumflex over ( )}dmin from the signal space between adjacent codewords to the decision boundaries of all other valid codewords. The signal space with respect to the minimum distances is not a limiting aspect of the invention; however, in the preferred embodiment the codewords are selected to maximize the minimum distances in Euclidean space. Thus, the read signal is sampled and equalized according to a partial response spectrum, and maximum likelihood detection is employed to detect the servo codewords in Euclidean space. The code rate is selected according to certain design criteria such as the amount of error correction desired, the data density, and the cost and complexity of the encoder/decoder circuitry. After selecting the code rate and number of bits per codeword, a computer search is carried out to find a subset of codewords large enough to encode the track addresses while providing large minimum distance values for dmin and {circumflex over ( )}dmin.
摘要翻译：公开了一种盘存储系统伺服代码检测器，其通过增加有效代码字之间的最小距离dmin和通过相邻代码字之间的信号空间增加最小距离{circumflex over（）} dmin来在跟踪和寻找期间提供增强的纠错能力，所有其他有效码字的决定边界。相对于最小距离的信号空间不是本发明的限制性的方面; 然而，在优选实施例中，选择码字以使欧几里德空间中的最小距离最大化。因此，读取信号根据部分响应频谱进行采样和均衡，并且采用最大似然检测来检测欧几里得空间中的伺服码字。根据某些设计标准选择码率，例如所需的纠错量，数据密度以及编码器/解码器电路的成本和复杂度。在选择码率和每个码字的比特数之后，执行计算机搜索以找到足够大的码字的子集，以对轨道地址进行编码，同时为dmin和{circumflex over（）} dmin提供较大的最小距离值。

2. 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。

3. 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。

4. 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。

5. 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。

6. 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。

7. 发明授权

US5862161A Sampled amplitude read channel with simplified sequence detector matched to partial erasure 失效
标题翻译：采样幅度读通道与简化的序列检测器匹配部分擦除
公开(公告)号：US5862161A
公开(公告)日：1999-01-19
申请号：US697694
申请日：1996-08-28
申请人： David E. Reed , Richard T. Behrens
发明人： David E. Reed , Richard T. Behrens
IPC分类号： G06F11/00 , H03M13/00
CPC分类号： H03M13/6343 , G11B20/10277 , H03M13/41 , H03M5/145 , G11B20/10064 , G11B20/10074 , G11B20/10175 , G11B20/1426 , G11B2220/2516
摘要： This invention provides apparatus for reliably and efficiently reading data from a magnetic storage medium under the condition that adjacent magnetization regions are partially erased. A simplified nonlinear description of a read signal resulting from such partially erased magnetization regions is used to derive a state machine model of the read signal. The state machine model implicitly defines a sequence detector for demodulating recorded data from received samples. For a PR4 signal, the state machine has ten states; for an EPR4 signal, the state machine has eighteen states; and for an EEPR4 signal, the state machine has twenty-six states. The PR4 machine is further simplified using squaring and state sharing to provide state machine models with six and four states.
摘要翻译：本发明提供了在相邻磁化区域被部分擦除的条件下可靠且有效地从磁存储介质读取数据的装置。使用由这种部分擦除的磁化区域产生的读取信号的简化的非线性描述来导出读取信号的状态机器模型。状态机模型隐含地定义用于解调来自接收样本的记录数据的序列检测器。对于PR4信号，状态机有十个状态; 对于EPR4信号，状态机有十八个状态; 对于EEPR4信号，状态机有二十六个状态。 PR4机器使用平方和状态共享进一步简化，以提供具有六个和四个状态的状态机模型。

8. 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。

9. 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。

10. 发明申请

US20110230158A1 Partitioned radio-frequency apparatus and associated methods 有权
公开(公告)号：US20110230158A1
公开(公告)日：2011-09-22
申请号：US13104822
申请日：2011-05-10
申请人： Donald A. Kerth , Richard T. Behrens , Jeffrey W. Scott , G. Diwakar Vishakhadatta , G. Tyson Tuttle , Vishnu Shankar Srinivasan
发明人： Donald A. Kerth , Richard T. Behrens , Jeffrey W. Scott , G. Diwakar Vishakhadatta , G. Tyson Tuttle , Vishnu Shankar Srinivasan
IPC分类号： H04B1/16
CPC分类号： H04B1/109 , H04B1/0003 , H04B1/28 , H04B1/406 , H04B15/02 , H04B15/04 , H04B2215/064 , H04L27/2649
摘要： Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式