公开(公告)号：US20120093241A1

公开(公告)日：2012-04-19

申请号：US13273916

申请日：2011-10-14

申请人： Shailendra K. Singh ,  Kevin D. Fisher

发明人： Shailendra K. Singh ,  Kevin D. Fisher

IPC分类号： H04B15/00

CPC分类号： H04B15/00 ,  H04B3/32

摘要： Alien noise is removed from one or more receptor DSL lines after self-FEXT has been eliminated or reduced. Information about the alien noise in the form of slicer errors can be obtained from one or more donor DSL lines that may or may not be in the same domain (e.g., a vectored DSL system).

摘要翻译： 在自动FEXT被消除或减少之后，外部噪声从一个或多个受体DSL线路上移除。 关于限幅器错误形式的外来噪声的信息可以从一个或多个施主DSL线路获得，该线路可以是或不在同一域（例如矢量DSL系统）。

公开(公告)号：US20120020418A1

公开(公告)日：2012-01-26

申请号：US13189095

申请日：2011-07-22

申请人： Nicholas Philip Sands ,  Stephanie Felicia Pereira ,  Darren Bradley Hutchinson ,  Kevin D. Fisher ,  Amitkumar Mahadevan

发明人： Nicholas Philip Sands ,  Stephanie Felicia Pereira ,  Darren Bradley Hutchinson ,  Kevin D. Fisher ,  Amitkumar Mahadevan

IPC分类号： H04L27/00

CPC分类号： H04B3/32

摘要： The memory storage, transmission and processing demands of a vectored DSL system are reduced by sampling a subset of DSL tones in the DSL tone range used in the vectored system. This data is smoothed (denoised) to further reduce the data's size, sacrificing some fidelity or precision as a result. Finally, lossless entropy coding or the like is performed to encode the FEXT cancellation data for storage and use. The resulting data is less likely to cause transmission bottlenecks in the vectored system, can be stored and used more efficiently for both on-chip and off-chip vectoring implementations, and can be readily updated in various ways.

摘要翻译： 矢量DSL系统的存储器存储，传输和处理需求通过在矢量系统中使用的DSL音调范围中采样DSL音调的子集来减少。 该数据被平滑（去噪），以进一步减少数据的大小，从而牺牲一些保真度或精度。 最后，执行无损熵编码等以对用于存储和使用的FEXT取消数据进行编码。 所得到的数据不太可能导致向量系统中的传输瓶颈，可以在片上和片外向量实现方面更有效地存储和使用，并且可以以各种方式容易地更新。

公开(公告)号：US5600502A

公开(公告)日：1997-02-04

申请号：US600015

申请日：1995-09-15

申请人： Kevin D. Fisher

发明人： Kevin D. Fisher

IPC分类号： G11B5/012 ,  G11B5/09 ,  G11B20/10 ,  H04L7/04

CPC分类号： G11B5/012 ,  G11B20/10009 ,  G11B5/09 ,  H04L7/041

摘要： A method is provided for elimination of periodic inter symbol interference (ISI) resulting in timing phase steps and channel amplitude control steps occurring following a periodic preamble pattern, such as a 1/4 T sine wave pattern and at the beginning of a random pattern user data field in a partial response, maximum likelihood digital magnetic data storage channel. The method comprises the steps of: determining a periodicity of periodic ISI events in relation to main magnetic flux transitions during playback of a periodic signal waveform thereof, writing a new preamble field to the magnetic data storage channel of a periodic signal waveform preceding the user data field in which the phase of the periodic signal waveform is shifted, e.g. 180 degrees, at the determined periodicity of undershoot events, and locking a digital data sampling timing loop and a digital channel gain control circuit to the new preamble field, whereby undershoot-induced ISI timing phase steps and amplitude control steps at the preamble-to-user data field transition region are eliminated.

摘要翻译： 提供了一种用于消除周期性符号间干扰（ISI）的方法，其导致定时相位步骤和信道幅度控制步骤之后发生在诸如+ E，fra 1/4 + EE T正弦波模式的周期性前导码模式之后，并且在 部分响应中的随机模式用户数据字段的开始，最大似然数字磁数据存储信道。 该方法包括以下步骤：在重放其周期信号波形期间确定与主磁通转换相关的周期性ISI事件的周期性，将新的前导字段写入用户数据之前的周期信号波形的磁数据存储信道 周期信号波形的相位偏移的场，例如 180度，以确定的下冲事件的周期性，并将数字数据采样定时环和数字信道增益控制电路锁定到新的前同步码字段，由此在前同步码到帧的下行诱导的ISI定时相位步长和幅度控制步骤中， 用户数据字段过渡区域被消除。

公开(公告)号：US5576906A

公开(公告)日：1996-11-19

申请号：US320540

申请日：1994-10-11

申请人： Kevin D. Fisher ,  Jim Fitzpatrick ,  Xiaodong Che

发明人： Kevin D. Fisher ,  Jim Fitzpatrick ,  Xiaodong Che

IPC分类号： G11B5/596 ,  G11B21/10

CPC分类号： G11B5/59655

摘要： Synchronous detection of fine position servo burst information with a data transducer having an electrical width not less than about two-thirds a width of a data track within a partial response maximum likelihood (PRML) data channel is disclosed. The servo burst information is recorded on a storage medium as a pair or series of fractional-track-width sinewave concurrent burst patterns and includes an on-track phase generating a position error signal which varies linearly with head displacement about track centerline and at least one off-track phase generating a position error signal which varies linearly with head displacement about a position related to track boundary. The method includes steps of reading the on-track phase and the off-track phase with a head to provide an analog signal stream, amplifying and low pass filtering the signal stream to normalize gain of the signal stream, synchronously quantizing the signal stream to provide synchronous digital burst samples, multiplying the synchronous digital burst samples during servo sampling intervals by a normalization factor generated by a correlation signal generator to provide normalized samples, integrating normalized samples originating during the on-track phase to provide an on-track position error signal, and integrating normalized samples originating during the off-track phase to provide an off-track position error signal. Circuitry implementing the method including a discrete matched filter is also disclosed.

摘要翻译： 公开了具有不小于部分响应最大似然（PRML）数据信道内的数据轨道宽度的大约三分之二的数据换能器的精细位置伺服突发信息的同步检测。 伺服脉冲串信息作为一对或一系列分数轨道宽度正弦波同时脉冲串模式记录在存储介质上，并且包括轨道上相位，其产生与磁道中心线的磁头位移线性变化的位置误差信号，以及至少一个 偏离轨道相位产生与围绕与轨道边界相关的位置的磁头位移线性变化的位置误差信号。 该方法包括以头为单位读取轨道上相位和偏离轨相位的步骤，以提供模拟信号流，对信号流进行放大和低通滤波以对信号流的增益进行归一化，同步量化信号流以提供 同步数字脉冲串采样，在伺服采样间隔期间将同步数字脉冲串采样乘以由相关信号发生器产生的归一化因子，以提供归一化采样，将在轨道相位期间产生的归一化采样积分，以提供在轨位置误差信号， 并且在偏离轨道相位期间积分归一化样本以提供偏离位置误差信号。 还公开了实现包括离散匹配滤波器的方法的电路。

公开(公告)号：US5384671A

公开(公告)日：1995-01-24

申请号：US174895

申请日：1993-12-23

申请人： Kevin D. Fisher

发明人： Kevin D. Fisher

IPC分类号： G11B20/12 ,  G11B5/55 ,  G11B20/10 ,  G11B21/08 ,  G11B21/10 ,  G11B27/30 ,  G11B5/09

CPC分类号： G11B27/3027 ,  G11B20/10009 ,  G11B5/5526 ,  G11B20/1258 ,  G11B2220/20

摘要： A synchronous servo data detection subsystem for a PRML sampled data channel of a hard disk drive including a plurality of radially extending servo sectors embedded on a rotating data storage surface. Each servo sector includes a servo synchronization field, a synchronous servo address mark field, and fields providing coarse and fine head position information. A data head reads and writes data signals from and to the storage surface, and a voice coil actuator structure positions the head at each selected data track under control of a head position servo loop. The sampled data channel receives, synchronously samples and decodes analog signals into digital data. and reads the servo fields as the data head passes over each servo sector. The servo detection system includes a timing loop for synchronizing the sampled data channel to the servo synchronization field to provide synchronous samples from the servo sector, a synchronous servo address mark pattern detector connected to an output of the sampled data channel for detecting the unique recording pattern and for thereupon generating a servo address mark found signal, a synchronous coarse head position information detector connected to an output of the sampled data channel responsive to the address mark found signal for detecting and accumulating coarse bits comprising the coarse head position information, and a synchronous fine head position detector connected to the sampled data channel for detecting the fine head position information. Preferably, the synchronous servo address mark pattern bears low correlation to the synchronization field and to the position information fields.

摘要翻译： 一种用于包括嵌入在旋转数据存储表面上的多个径向延伸的伺服扇区的硬盘驱动器的PRML采样数据通道的同步伺服数据检测子系统。 每个伺服扇区包括伺服同步字段，同步伺服地址标志字段以及提供粗略和精细的头部位置信息的字段。 数据头从存储表面读取和写入数据信号，并且音圈致动器结构在头位置伺服环路的控制下将头部定位在每个选定的数据轨道处。 采样数据通道同步采样和解码模拟信号为数字数据。 并在数据头通过每个伺服扇区时读取伺服字段。 伺服检测系统包括用于将采样数据信道同步到伺服同步字段的定时环，以提供来自伺服扇区的同步采样，连接到采样数据信道的输出的同步伺服地址标记模式检测器，用于检测独特的记录模式 为了产生伺服地址标识发现信号，同步粗略头位置信息检测器响应于地址标识发现信号连接到采样数据信道的输出，用于检测和累加包括粗略头位置信息的粗略位，并且同步 连接到采样数据通道的精细头位置检测器用于检测细头位置信息。 优选地，同步伺服地址标志模式与同步字段和位置信息字段的相关性低。

公开(公告)号：US08848504B2

公开(公告)日：2014-09-30

申请号：US13273916

申请日：2011-10-14

申请人： Shailendra K. Singh ,  Kevin D. Fisher

发明人： Shailendra K. Singh ,  Kevin D. Fisher

IPC分类号： H04M1/74 ,  H04B3/32 ,  H04B15/00

CPC分类号： H04B15/00 ,  H04B3/32

摘要： Alien noise is removed from one or more receptor DSL lines after self-FEXT has been eliminated or reduced. Information about the alien noise in the form of slicer errors can be obtained from one or more donor DSL lines that may or may not be in the same domain (e.g., a vectored DSL system).

摘要翻译： 在自动FEXT被消除或减少之后，外部噪声从一个或多个受体DSL线路上移除。 关于限幅器错误形式的外来噪声的信息可以从一个或多个施主DSL线路获得，该线路可以是或不在同一域（例如矢量DSL系统）。

公开(公告)号：US20130148796A1

公开(公告)日：2013-06-13

申请号：US13493914

申请日：2012-06-11

申请人： Massimo Sorbara ,  William J. Santulli ,  Clark B. Woodworth ,  Kachung Wong ,  Kevin D. Fisher

发明人： Massimo Sorbara ,  William J. Santulli ,  Clark B. Woodworth ,  Kachung Wong ,  Kevin D. Fisher

IPC分类号： H04M3/00

CPC分类号： H04M3/002 ,  H04B3/32 ,  H04M11/062

摘要： DSL backchannel data and/or information is transported upstream in a vectored, bonded line DSL system. Backchannel data (e.g., error samples or the like from downstream-end DSL equipment) is encapsulated/packetized using Layer 2 encapsulation. Upstream user data is packetized into Ethernet packets or the like. The backchannel data and upstream user data are combined and the combined data transmitted to an upstream-end DSL apparatus, such as an access node. The combined data are separated in the upstream-end DSL apparatus so that the upstream user data can be processed further. The Layer 2 encapsulated backchannel data is decapsulated and then routed to a vectoring control entity or the like for use in operating the DSL system, for example in mitigating FEXT crosstalk in the DSL system's operation.

摘要翻译： DSL后向信道数据和/或信息在向量的绑定线路DSL系统中向上游传送。 使用第2层封装来封装/分组来自下行端DSL设备的反向信道数据（例如，错误样本等）。 上行用户数据被分组成以太网数据包等。 组合后向通道数据和上行用户数据，并将组合的数据发送到诸如接入节点的上游DSL设备。 组合数据在上游DSL设备中分离，从而可以进一步处理上游用户数据。 层2封装的反向信道数据被解封装，然后被路由到矢量控制实体等以用于操作DSL系统，例如在DSL系统的操作中减轻FEXT串扰。

公开(公告)号：US20110142111A1

公开(公告)日：2011-06-16

申请号：US13058477

申请日：2009-08-08

申请人： Nicholas P. Sands ,  Kevin D. Fisher

发明人： Nicholas P. Sands ,  Kevin D. Fisher

IPC分类号： H04B1/38

CPC分类号： H04B3/32 ,  H04B3/487 ,  H04M11/062 ,  Y02D50/44

摘要： A vectored DSL system reduces or eliminates correlated alien interference in active DSL lines in the vectored system by collecting pseudo signals from inactive lines that do not carry upstream DSL transmissions and/or from common-mode voltage signals from active lines. The collected pseudo signals contain in-domain interference, such as FEXT interference from the active DSL lines in the vectored system, and correlated alien interference. After removing the in-domain interference from the pseudo signals, the remaining alien interference data can be used to generate FEXT cancellation coefficients or the like that are used in DSL vectoring to remove the correlated alien interference from upstream DSL user signals from the active DSL lines. The generated FEXT cancellation coefficients are used in a manner analogous to in-domain FEXT data collected from the active lines during training, tracking, etc. The vectored DSL system can include modems coupled to a private vectoring data routing apparatus to one or more vectoring modules The vectoring modules can employ vector processors that include processing units configured to process collected user data on the basis of all modems' data for a given DSL tone grouping, thus removing FEXT effects from the user data and returning vectored user data to the modems using the routing apparatus, which can be a specialized data transmission network utilizing one or more vector routers.

摘要翻译： 矢量DSL系统通过从不带有上行DSL传输和/或来自有源线路的共模电压信号的非活动线路收集伪信号来减少或消除向量系统中活动DSL线路中的相关外来干扰。 所收集的伪信号包含域内干扰，例如来自向量系统中的活动DSL线路的FEXT干扰以及相关的外部干扰。 在从伪信号中去除域内干扰之后，剩余的外来干扰数据可用于产生用于DSL矢量化中的FEXT消除系数等，以消除来自有源DSL线路的上游DSL用户信号的相关外来干扰 。 生成的FEXT消除系数以类似于在训练，跟踪等期间从有效行收集的域内FEXT数据的方式使用。矢量DSL系统可以包括耦合到专用向量化数据路由装置的调制解调器到一个或多个矢量模块 矢量化模块可以使用矢量处理器，其包括被配置为基于用于给定DSL音调分组的所有调制解调器的数据来处理所收集的用户数据的处理单元，从而从用户数据中消除FEXT效应，并使用 路由设备，其可以是利用一个或多个向量路由器的专用数据传输网络。

公开(公告)号：US20110110409A1

公开(公告)日：2011-05-12

申请号：US13002213

申请日：2009-06-30

申请人： Nicholas P. Sands ,  Kevin D. Fisher

发明人： Nicholas P. Sands ,  Kevin D. Fisher

IPC分类号： H04L29/02 ,  H04B1/38

CPC分类号： H04B3/487 ,  H04B3/32

摘要： A reduced-memory vectored DSL system includes methods and apparatus for reducing the bandwidth and memory storage demands on a vectored DSL system in which FEXT data is transmitted and stored. An upstream-end device such as a DSLAM communicates with a plurality of downstream-end devices such as CPE modems. When test signal data, such as training and/or tracking data, is sent to determine FEXT characteristics of the DSL system, error signals are available for all or substantially all of the upstream and/or downstream frequency band DSL tones used in the system. Dividing a frequency band into sub-bands, only a subset of tones in each sub-band is used for deriving FEXT data, such as a FEXT channel response, FEXT channel coefficients and/or FEXT cancellation coefficients. For tones in the sub-band subsets, full-precision FEXT data values can be derived. For other tones, approximations of the FEXT data can be derived. Alternatively, FEXT data can be defined as a base point and associated differential/incremental values that define full-precision and/or approximation FEXT data with fewer bits by utilizing a Δ value relative to either a sub-band base point or relative to another tone's value. Memory is reduced in both the transmission of such FEXT data (between upstream and downstream ends of the DSL system) as well as within an upstream-end device such as a DSLAM that performs vectoring using a separate or internal vectoring processing apparatus. Memory also is reduced in the storage of such FEXT data in or off of the DSLAM or other upstream-end device.

摘要翻译： 减少存储器向量的DSL系统包括用于减少其中发送和存储FEXT数据的向量DSL系统的带宽和存储器存储需求的方法和装置。 诸如DSLAM的上游设备与多个下游端设备（例如CPE调制解调器）通信。 当测试信号数据（例如训练和/或跟踪数据）被发送以确定DSL系统的FEXT特性时，错误信号可用于系统中使用的所有或基本上所有上游和/或下游频带DSL音调。 将频带划分成子带，每个子带中只有一个音调子集用于导出FEXT数据，例如FEXT信道响应，FEXT信道系数和/或FEXT抵消系数。 对于子带子集中的音调，可以导出全精度FEXT数据值。 对于其他色调，可以导出FEXT数据的近似值。 或者，FEXT数据可以被定义为通过利用＆Dgr来定义具有较少位的全精度和/或近似FEXT数据的基点和相关联的差分/增量值。 相对于子带基点或相对于另一个音调的值。 在这种FEXT数据（在DSL系统的上游和下游端之间）的传输以及诸如使用单独的或内部的向量化处理设备执行向量化的DSLAM的上游设备中，存储器都被减少。 将这样的FEXT数据存储在DSLAM或其他上游设备中或之外的存储器也减少了。

公开(公告)号：US5862005A

公开(公告)日：1999-01-19

申请号：US724977

申请日：1996-10-03

申请人： Michael D. Leis ,  Ara Patapoutian ,  Mathew P. Vea ,  Richard M. Ehrlich ,  Kevin D. Fisher ,  James A. Henson ,  William R. Akin, Jr.

发明人： Michael D. Leis ,  Ara Patapoutian ,  Mathew P. Vea ,  Richard M. Ehrlich ,  Kevin D. Fisher ,  James A. Henson ,  William R. Akin, Jr.

IPC分类号： G11B20/14 ,  G11B5/55 ,  G11B5/596 ,  G11B20/10 ,  G11B20/18 ,  G11B21/08 ,  G11B21/10 ,  G11B27/30 ,  H03M13/23 ,  H04L25/49 ,  G11B5/02 ,  G11B5/09

CPC分类号： G11B20/10009 ,  G11B20/1833 ,  G11B21/083 ,  G11B27/3027 ,  G11B5/5526 ,  G11B5/59655 ,  G11B5/59688 ,  H04L25/4904 ,  G11B2220/20 ,  G11B5/59627 ,  G11B5/5965

摘要： A magnetic disk drive data storage disk defines recording tracks divided into data sectors by narrow servo spokes. A data sector lying between servo spokes is recorded with user data encoded in accordance with a code having a predetermined distance and user data code rate. Each servo spoke of the recording area has at least one servo information field encoded in a wide bi-phase code pattern. The disk drive further includes a synchronous sampling data detection channel having a data transducer head positioned by a servo-controlled actuator over the recording track, a preamplifier for receiving electrical analog signals magnetically induced by the data transducer head from flux transitions present in at least the servo information field, a digital sampler for synchronously sampling the electrical analog signals to produce digital samples, and wide bi-phase decoding circuitry coupled to receive digital samples from the synchronous sampling data detection channel for decoding the wide bi-phase code pattern.