公开(公告)号：US5280489A

公开(公告)日：1994-01-18

申请号：US869570

申请日：1992-04-15

申请人： Lyle J. Fredrickson ,  Razmik Karabed ,  James W. Rae ,  Paul H. Siegel ,  Hemant K. Thapar ,  Roger W. Wood

发明人： Lyle J. Fredrickson ,  Razmik Karabed ,  James W. Rae ,  Paul H. Siegel ,  Hemant K. Thapar ,  Roger W. Wood

IPC分类号： H03M13/31 ,  G06F11/20 ,  H03M13/12

CPC分类号： H03M13/31

摘要： A method and apparatus for detecting spectral null sequences of a spectrally-constrained code on a noisy communications channel. From a Viterbi detector with a trellis structure comprising a plurality of states and edges, predetermined ones of the states and edges in the trellis structure are deleted at preselected times modulo N, such as times .phi. modulo N and/or at intermediate times m modulo N, where m=.phi., thereby to create a time-varying trellis structure for limiting the maximum length of dominant error events. The deleted edges are generally those edges which would have entered or emanated from the deleted states if they were not deleted. The trellis structure may be a so-called systolic structure, in which case the spectral null sequences are preferably DC-free or Nyquist free.

摘要翻译： 一种用于检测噪声通信信道上的频谱约束码的频谱零序列的方法和装置。 从具有包括多个状态和边缘的网格结构的维特比检测器，网格结构中的预定的状态和边缘被预选为时间N，例如时间（phi）模N和/或中间时间m 模N，其中m =（phi），从而产生用于限制主要误差事件的最大长度的时变网格结构。 删除的边通常是那些从删除状态输入或发出的边缘，如果它们没有被删除。 网格结构可以是所谓的收缩结构，在这种情况下，光谱无效序列优选不含DC或奈奎斯特。

公开(公告)号：US5537424A

公开(公告)日：1996-07-16

申请号：US289811

申请日：1994-08-12

申请人： Razmik Karabed ,  James W. Rae ,  Paul H. Siegel ,  Hemant K. Thapar

发明人： Razmik Karabed ,  James W. Rae ,  Paul H. Siegel ,  Hemant K. Thapar

IPC分类号： H03M13/31 ,  H03M13/41 ,  H04L25/497 ,  H03M13/12

CPC分类号： H03M13/6343 ,  H03M13/31 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/4107 ,  H03M13/4169 ,  H03M13/6502 ,  H04L25/497

摘要： Apparatus and method for transmitting spectral null sequences of a spectrally-constrained code over a partial response channel. A Viterbi detector receives the sequences from the channel and has a time-varying detector trellis structure derived from a running-digital-sum (RDS) trellis structure that requires each one of a set of quasicatastrophic sequences to be generated only from a trellis state corresponding to a respective preselected unique RDS value.

摘要翻译： 用于在部分响应信道上发送频谱约束码的频谱零序列的装置和方法。 维特比检测器从信道接收序列，并且具有从运行数字和（RDS）网格结构导出的时变检测器网格结构，其需要仅从对应的网格状态产生一组准基因阵列序列中的每一个 到相应的预选的唯一RDS值。

公开(公告)号：US07743314B2

公开(公告)日：2010-06-22

申请号：US11607492

申请日：2006-12-01

申请人： Heinrich J. Stockmanns ,  William G. Bliss ,  Razmik Karabed ,  James W. Rae

发明人： Heinrich J. Stockmanns ,  William G. Bliss ,  Razmik Karabed ,  James W. Rae

IPC分类号： H03M13/03

CPC分类号： G11B20/10296 ,  G11B20/10009

摘要： An improved Viterbi detector is disclosed in which each branch metric is calculated based on noise statistics that depend on the signal hypothesis corresponding to the branch. Also disclosed is a method of reducing the complexity of the branch metric calculations by clustering branches corresponding to signals with similar signal-dependent noise statistics. A feature of this architecture is that the branch metrics (and their corresponding square difference operators) are clustered into multiple groups, where all the members of each group draw input from a single, shared noise predictive filter corresponding to the group. In recording technologies as practiced today, physical imperfections in the representation of recorded user data in the recording medium itself are becoming the dominate source of noise in the read back data. This noise is highly dependent on what was (intended to be) written in the medium. The disclosed Viterbi detector exploits this statistical dependence of the noise on the signal.

摘要翻译： 公开了一种改进的维特比检测器，其中基于依赖于与分支对应的信号假设的噪声统计来计算每个分支度量。 还公开了一种通过对与具有相似的信号相关噪声统计信号的信号进行聚类的分支来降低分支度量计算的复杂度的方法。 该架构的一个特点是分支度量（及其对应的平方差运算符）被聚集成多个组，其中每个组的所有成员从与组相对应的单个共享噪声预测滤波器中绘制输入。 在今天所采用的记录技术中，在记录介质本身中记录的用户数据的表示中的物理缺陷正在回读数据中成为主要的噪声源。 这种噪音很大程度上取决于介质中写的内容。 所公开的维特比检测器利用噪声对信号的统计依赖性。

公开(公告)号：US08015477B2

公开(公告)日：2011-09-06

申请号：US12819993

申请日：2010-06-21

申请人： Heinrich J. Stockmanns ,  William G. Bliss ,  Razmik Karabed ,  James W. Rae

发明人： Heinrich J. Stockmanns ,  William G. Bliss ,  Razmik Karabed ,  James W. Rae

IPC分类号： H03M13/03

CPC分类号： G11B20/10296 ,  G11B20/10009

摘要： An improved Viterbi detector is disclosed in which each branch metric is calculated based on noise statistics that depend on the signal hypothesis corresponding to the branch. Also disclosed is a method of reducing the complexity of the branch metric calculations by clustering branches corresponding to signals with similar signal-dependent noise statistics. A feature of this architecture is that the branch metrics (and their corresponding square difference operators) are clustered into multiple groups, where all the members of each group draw input from a single, shared noise predictive filter corresponding to the group. In recording technologies as practiced today, physical imperfections in the representation of recorded user data in the recording medium itself are becoming the dominate source of noise in the read back data. This noise is highly dependent on what was (intended to be) written in the medium. The disclosed Viterbi detector exploits this statistical dependence of the noise on the signal.

摘要翻译： 公开了一种改进的维特比检测器，其中基于依赖于与分支对应的信号假设的噪声统计来计算每个分支度量。 还公开了一种通过对与具有相似的信号相关噪声统计信号的信号进行聚类的分支来降低分支度量计算的复杂度的方法。 该架构的一个特点是分支度量（及其对应的平方差运算符）被聚集成多个组，其中每个组的所有成员从与组相对应的单个共享噪声预测滤波器中绘制输入。 在今天所采用的记录技术中，在记录介质本身中记录的用户数据的表示中的物理缺陷正在回读数据中成为主要的噪声源。 这种噪音很大程度上取决于介质中写的内容。 所公开的维特比检测器利用噪声对信号的统计依赖性。

公开(公告)号：US20100322359A1

公开(公告)日：2010-12-23

申请号：US12819993

申请日：2010-06-21

申请人： Heinrich J. Stockmanns ,  William G. Bliss ,  Razmik Karabed ,  James W. Rae

发明人： Heinrich J. Stockmanns ,  William G. Bliss ,  Razmik Karabed ,  James W. Rae

IPC分类号： H04L27/06

CPC分类号： G11B20/10296 ,  G11B20/10009

摘要： An improved Viterbi detector is disclosed in which each branch metric is calculated based on noise statistics that depend on the signal hypothesis corresponding to the branch. Also disclosed is a method of reducing the complexity of the branch metric calculations by clustering branches corresponding to signals with similar signal-dependent noise statistics. A feature of this architecture is that the branch metrics (and their corresponding square difference operators) are clustered into multiple groups, where all the members of each group draw input from a single, shared noise predictive filter corresponding to the group. In recording technologies as practiced today, physical imperfections in the representation of recorded user data in the recording medium itself are becoming the dominate source of noise in the read back data. This noise is highly dependent on what was (intended to be) written in the medium. The disclosed Viterbi detector exploits this statistical dependence of the noise on the signal.

摘要翻译： 公开了一种改进的维特比检测器，其中基于依赖于与分支对应的信号假设的噪声统计来计算每个分支度量。 还公开了一种通过对与具有相似的信号相关噪声统计信号的信号进行聚类的分支来降低分支度量计算的复杂度的方法。 该架构的一个特点是分支度量（及其对应的平方差运算符）被聚集成多个组，其中每个组的所有成员从与组相对应的单个共享噪声预测滤波器中绘制输入。 在今天所采用的记录技术中，在记录介质本身中记录的用户数据的表示中的物理缺陷正在回读数据中成为主要的噪声源。 这种噪音很大程度上取决于介质中写的内容。 所公开的维特比检测器利用噪声对信号的统计依赖性。

公开(公告)号：US06594094B2

公开(公告)日：2003-07-15

申请号：US10025001

申请日：2001-12-18

申请人： James W. Rae ,  William Bliss ,  Jonathan Ashley ,  Razmik Karabed ,  Stephen J. Franck ,  Fritz Mistlberger ,  Matthias Driller ,  Heinrich Stockmanns ,  Dominik Margraf

发明人： James W. Rae ,  William Bliss ,  Jonathan Ashley ,  Razmik Karabed ,  Stephen J. Franck ,  Fritz Mistlberger ,  Matthias Driller ,  Heinrich Stockmanns ,  Dominik Margraf

IPC分类号： G11B502

CPC分类号： G11B20/10055 ,  G11B5/012 ,  G11B5/09 ,  G11B5/59688 ,  G11B5/6076 ,  G11B20/10009 ,  G11B20/10037

摘要： An improved sampled amplitude read/write channel is provided. The system is an integrated Generalized Partial Response Maximum Likelihood (GPRML) read channel incorporating Read, Write, and Servo modes of operation. One implementation includes a 32/34 rate parity code and matched Viterbi detector, a 32 state Viterbi detector optimal parity processor, robust frame synchronization, self-adaptive equalization, thermal asperity detection and compensation, adaptive magneto-resistive asymmetry compensation, low latency interpolated timing recovery and programmable write precompensation.

摘要翻译： 提供了一种改进的采样幅度读/写通道。 该系统是集成了读，写和伺服操作模式的集成广义部分响应最大似然（GPRML）读通道。 一个实现包括32/34速率奇偶校验码和匹配维特比检测器，32状态维特比检测器最佳奇偶校验处理器，鲁棒帧同步，自适应均衡，热粗糙度检测和补偿，自适应磁阻不对称补偿，低延迟内插时序 恢复和可编程预写。

公开(公告)号：US06809894B2

公开(公告)日：2004-10-26

申请号：US09896135

申请日：2001-06-29

申请人： William G. Bliss ,  Razmik Karabed ,  James W. Rae ,  Heiner Stockmanns ,  Kaichi Zhang

发明人： William G. Bliss ,  Razmik Karabed ,  James W. Rae ,  Heiner Stockmanns ,  Kaichi Zhang

IPC分类号： G11B509

CPC分类号： G11B20/1217 ,  G11B20/10009 ,  G11B2220/2516

摘要： A method and apparatus for handling end of data processing in a data storage device. The method includes receiving a plurality of user data bits at a write channel. The method further includes appending primary padding bits to user data bits if the plurality of user data bits is less than a multiple of an input block length of an encoder in the write channel and encoding the plurality of user data bits and any primary padding bits into a plurality of encoded data bytes. Additionally, the method includes appending an end of data marker to an end of the plurality of encoded data bytes, wherein the end of data marker has a length of no more than one byte, and writing the plurality of encoded data bytes and the end of data marker to the data store.

摘要翻译： 一种处理数据存储装置中的数据处理结束的方法和装置。 该方法包括在写入通道处接收多个用户数据位。 该方法还包括：如果多个用户数据位小于写通道中编码器的输入块长度的倍数，并将多个用户数据位和任何主填充位编码为多个，则将主填充位附加到用户数据位 多个编码数据字节。 此外，该方法包括将数据标记的结尾附加到多个编码数据字节的末尾，其中数据标记的结尾具有不超过一个字节的长度，并写入多个编码数据字节和结束 数据标记到数据存储。

公开(公告)号：US06788482B2

公开(公告)日：2004-09-07

申请号：US09896134

申请日：2001-06-29

申请人： William G. Bliss ,  Razmik Karabed ,  James W. Rae ,  Heiner Stockmanns

发明人： William G. Bliss ,  Razmik Karabed ,  James W. Rae ,  Heiner Stockmanns

IPC分类号： G11B509

CPC分类号： H03M13/6343 ,  G11B20/10009 ,  H03M13/3961 ,  H03M13/4107 ,  H03M13/6502 ,  H03M13/6583

摘要： A method and apparatus for Viterbi detector state metric re-normalization. The method includes fabricating a Viterbi detector (138) having a predetermined number of states, wherein the Viterbi detector (138) stores a state metric value and a branch metric value for each state, and wherein the Viterbi detector (138) implements a trellis diagram. The method includes constructing a Viterbi detector (138) which can support a state metric value having g+h′ number of bits. The number of bits needed to represent the branch metric value is represented by (g) and the additional number of bits needed to represent the state metric value is represented by (h′). The additional number of bits (h′) is less than the additional number of bits (h) determined using the following inequality: 2h−1−h≧K−1, wherein K represent the constraint length of the trellis diagram.

摘要翻译： 一种用于维特比检测器状态度量重新归一化的方法和装置。 该方法包括制造具有预定数量状态的维特比检测器（138），其中维特比检测器（138）存储每个状态的状态度量值和分支度量值，并且其中维特比检测器（138）实现格状图 。 该方法包括构造可支持具有g + h'比特数的状态度量值的维特比检测器（138）。 表示分支量度值所需的位数由（g）表示，表示状态量度值所需的附加位数由（h'）表示。 附加位数（h'）小于使用以下不等式确定的附加位数（h）：2 -h> = K-1，其中K表示网格图的约束长度 。

公开(公告)号：US5327440A

公开(公告)日：1994-07-05

申请号：US776142

申请日：1991-10-15

申请人： Lyle J. Fredrickson ,  James W. Rae

发明人： Lyle J. Fredrickson ,  James W. Rae

IPC分类号： G11B20/18 ,  H03M13/23 ,  H03M13/41 ,  G06F11/10

CPC分类号： H03M13/6343 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/4107 ,  H03M13/6502

摘要： Viterbi trellis coding methods and Viterbi detector apparatus are provided for detecting trellis coded data. A systolic array Viterbi detector recursively calculates path metrics and partial sums of metric update equations to determine codeword sequences having minimum mean squared error for Viterbi-type maximum-likelihood data detection. The systolic array Viterbi detector is arranged to eliminate redundant calculations and simplify hardware requirements. Modified butterfly trellis geometries and rotating state metrics arrangements are provided for simplifying the Viterbi detector.

摘要翻译： 提供了维特比网格编码方法和维特比检测器装置，用于检测网格编码数据。 收缩阵列维特比检测器递归地计算度量更新方程的路径度量和部分和以确定维特比型最大似然数据检测具有最小均方误差的码字序列。 收缩阵列维特比检测器被设置为消除冗余计算并简化硬件要求。 提供了改进的蝶形网格几何形状和旋转状态度量布置，以简化维特比检测器。

公开(公告)号：US5121263A

公开(公告)日：1992-06-09

申请号：US429750

申请日：1989-10-31

申请人： Gregory J. Kerwin ,  James W. Rae

发明人： Gregory J. Kerwin ,  James W. Rae

IPC分类号： G11B20/10 ,  G11B20/18 ,  G11B27/36

CPC分类号： G11B20/10055 ,  G11B20/10009 ,  G11B20/1816 ,  G11B27/36

摘要： In a disk drive providing amplitude sampling data detection, the amplitude of an analog read back signal is sampled at data clock intervals. The resulting analog values are converted to digital equivalent values. The digital equivalent values are each compared to an expected digital values that is representative of the data that was originally recorded on the disk, to thereby generate a different value. The resulting collection of difference values are magnitude segregated, and then stored in a plurality of registers, for later use in providing a histogram that is a measure of the disk drive's read error rate.