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    DATA INTERLEAVING IN TAPE DRIVES
    1.
    发明申请
    DATA INTERLEAVING IN TAPE DRIVES 有权
    磁带驱动器中的数据交互

    公开(公告)号：US20100232047A1

    公开(公告)日：2010-09-16

    申请号：US12720711

    申请日：2010-03-10

    申请人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Thomas Mittelholzer

    发明人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Thomas Mittelholzer

    IPC分类号： G11B5/09 ,  G06F13/28

    CPC分类号： G11B20/1202 ,  G11B20/1833 ,  G11B20/1866 ,  G11B2020/1836 ,  G11B2020/1853 ,  G11B2220/93

    摘要： Methods and apparatus for interleaving data in a multitrack tape drive and for writing data on a multitrack tape in the tape drive. One method includes: partitioning the data into m(2n+k) data blocks, where each data block has a logical array of rows and columns of data bytes; error-correction coding a row and a column of the logical array to produce an encoded block; assigning the coded row to a respective location in a logical interleave array having L rows and 2n+k columns of locations; and writing a sequence of assigned coded rows simultaneously in respective data tracks on the multitrack tape. The coded row is assigned such that the minimum Euclidean distance on the multitrack tape between the coded rows is maximized. The apparatus includes units for performing the methods and the computer program product includes a program code means for causing a computer to perform the methods.

    摘要翻译： 用于在多轨磁带驱动器中交织数据并在磁带驱动器中的多轨磁带上写入数据的方法和装置。 一种方法包括：将数据划分为m（2n + k）个数据块，其中每个数据块具有数据字节的行和列的逻辑阵列; 对逻辑阵列的行和列进行纠错编码以产生编码块; 将编码行分配给具有L行和2n + k列位置的逻辑交错阵列中的相应位置; 以及在多轨磁带上的相应数据轨道中同时写入分配的编码行序列。 分配编码行使得编码行之间的多轨磁带上的最小欧几里得距离最大化。 所述装置包括用于执行所述方法的单元，并且所述计算机程序产品包括用于使计算机执行所述方法的程序代码装置。

    Data interleaving in tape drives
    2.
    发明授权
    Data interleaving in tape drives 有权
    磁带驱动器中的数据交织

    公开(公告)号：US08144414B2

    公开(公告)日：2012-03-27

    申请号：US12720711

    申请日：2010-03-10

    申请人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S Eleftheriou ,  Thomas Mittelholzer

    发明人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S Eleftheriou ,  Thomas Mittelholzer

    IPC分类号： G11B5/09 ,  H03M13/03

    CPC分类号： G11B20/1202 ,  G11B20/1833 ,  G11B20/1866 ,  G11B2020/1836 ,  G11B2020/1853 ,  G11B2220/93

    摘要： Methods and apparatus for interleaving data in a multitrack tape drive and for writing data on a multitrack tape in the tape drive. One method includes: partitioning the data into m(2n+k) data blocks, where each data block has a logical array of rows and columns of data bytes; error-correction coding a row and a column of the logical array to produce an encoded block; assigning the coded row to a respective location in a logical interleave array having L rows and 2n+k columns of locations; and writing a sequence of assigned coded rows simultaneously in respective data tracks on the multitrack tape. The coded row is assigned such that the minimum Euclidean distance on the multitrack tape between the coded rows is maximized. The apparatus includes units for performing the methods and the computer program product includes a program code means for causing a computer to perform the methods.

    摘要翻译： 用于在多轨磁带驱动器中交织数据并在磁带驱动器中的多轨磁带上写入数据的方法和装置。 一种方法包括：将数据划分为m（2n + k）个数据块，其中每个数据块具有数据字节的行和列的逻辑阵列; 对逻辑阵列的行和列进行纠错编码以产生编码块; 将编码行分配给具有L行和2n + k列位置的逻辑交错阵列中的相应位置; 以及在多轨磁带上的相应数据轨道中同时写入分配的编码行序列。 分配编码行使得编码行之间的多轨磁带上的最小欧几里得距离最大化。 所述装置包括用于执行所述方法的单元，并且所述计算机程序产品包括用于使计算机执行所述方法的程序代码装置。

    WORD SYNCHRONIZATION FOR SERVO READ SIGNALS IN TAPE DRIVES
    3.
    发明申请
    WORD SYNCHRONIZATION FOR SERVO READ SIGNALS IN TAPE DRIVES 有权
    用于伺服读取信号在磁带驱动器中的字同步

    公开(公告)号：US20090316773A1

    公开(公告)日：2009-12-24

    申请号：US12487050

    申请日：2009-06-18

    申请人： Roy Daron Cideciyan ,  Giovanni Cherubini ,  Evangelos S. Eleftheriou ,  Jens Jelitto

    发明人： Roy Daron Cideciyan ,  Giovanni Cherubini ,  Evangelos S. Eleftheriou ,  Jens Jelitto

    IPC分类号： H03K9/04

    CPC分类号： G11B5/584

    摘要： Methods and apparatus for detecting L-bit sync words occurring at N-bit intervals in PPM-encoded servo pattern read signals read in magnetic tape drives. A soft output detector processes the PPM-encoded servo pattern read signal to produce a series of soft output samples corresponding to respective bits encoded in the servo pattern. A sync word detector then produces block correlation values for respective positions of a sliding L-sample block in the series of soft output samples by (i) calculating at each block position bit correlation values indicating correlation between respective samples and corresponding bits of the sync word and (ii) summing each bit correlation value minus a predetermined function of the corresponding sample value. The sync word detector then detects a sync word at the block position with the maximum block correlation value in an (N+L−1)-sample sequence of the series of soft output samples.

    摘要翻译： 用于检测在磁带驱动器中读取的PPM编码的伺服模式读取信号中以N位间隔发生的L位同步字的方法和装置。 软输出检测器处理PPM编码的伺服模式读取信号以产生与伺服模式中编码的各个位对应的一系列软输出样本。 同步字检测器然后通过以下步骤产生一系列软输出样本中的滑动L样本块的相应位置的块相关值：（i）在每个块位置计算指示相应采样和同步字的相应位之间的相关性的位相关值 和（ii）将每个比特相关值减去减去对应样本值的预定函数。 同步字检测器随后在软输出样本序列的（N + L-1） - 采样序列中检测具有最大块相关值的块位置处的同步字。

    SERVO CHANNEL FOR TAPE DRIVE SYSTEMS
    4.
    发明申请
    SERVO CHANNEL FOR TAPE DRIVE SYSTEMS 有权
    用于磁带驱动系统的伺服通道

    公开(公告)号：US20090174964A1

    公开(公告)日：2009-07-09

    申请号：US11969184

    申请日：2008-01-03

    申请人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Robert Allen Hutchins ,  Jens Jelitto

    发明人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Robert Allen Hutchins ,  Jens Jelitto

    IPC分类号： G11B5/584

    CPC分类号： G11B5/584

    摘要： Provided are techniques for synchronous servo channel for a data tape drive. A servo reader is configured to read servo bursts from a data tape. An anti-aliasing filter is operable to output a bandlimited signal and is coupled to receive a servo channel signal comprising servo bursts from the servo reader. An analog-to-digital converter (ADC) is operable to output signal samples and is coupled to receive the bandlimited signal from the anti-aliasing filter. An interpolation and control unit is operable to output interpolated signal samples and control signals, has a first input coupled to receive the signal samples from the ADC, and has a second input coupled to receive the correlation signal samples from the dibit correlator. A dibit correlator is operable to output correlation signal samples and is coupled to receive the interpolated signal samples and control signals from the interpolation and control unit.

    摘要翻译： 提供了用于数据磁带驱动器的同步伺服通道的技术。 伺服读取器被配置为从数据磁带读取伺服脉冲串。 抗混叠滤波器可操作以输出带限信号，并且耦合以接收包括来自伺服读取器的伺服脉冲串的伺服信道信号。 模数转换器（ADC）可操作以输出信号采样并被耦合以从抗混叠滤波器接收带限信号。 内插和控制单元可操作以输出内插信号样本和控制信号，具有耦合以从ADC接收信号样本的第一输入，并具有耦合以从双位相关器接收相关信号样本的第二输入。 双向相关器可操作以输出相关信号样本，并被耦合以从内插和控制单元接收内插的信号样本和控制信号。

    Error correction coding of longitudinal position information
    5.
    发明授权
    Error correction coding of longitudinal position information 有权
    纵向位置信息的纠错编码

    公开(公告)号：US07787204B2

    公开(公告)日：2010-08-31

    申请号：US12052688

    申请日：2008-03-20

    申请人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Robert Allen Hutchins

    发明人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Robert Allen Hutchins

    IPC分类号： G11B5/09 ,  G11B5/584

    CPC分类号： G11B20/1201 ,  G11B5/584 ,  G11B20/14 ,  G11B20/1833 ,  G11B20/1866 ,  G11B2020/1281 ,  G11B2020/1284 ,  G11B2020/1287 ,  G11B2020/1484 ,  G11B2020/1836 ,  G11B2220/90 ,  G11B2220/93 ,  G11B2220/95

    摘要： A sequential data storage medium, comprising a sequence of plurality of servo patterns that provide lateral position information and longitudinal position information, wherein each of the plurality of servo patterns comprises a first burst comprising a first plurality of pulses, a second burst comprising a second plurality of pulses, a third burst comprising a third plurality of pulses, and a fourth burst comprising a fourth plurality of pulses. The spacings between the first plurality of pulses, in combination with the spacings between the second plurality of pulses, encode a first bit without affecting the recovery of lateral position information. The spacings between the third plurality of pulses, in combination with the spacings between the fourth plurality of pulses, encode a second bit without affecting the recovery of lateral position information. The sequence of plurality of servo patterns comprises a sequence of the first bits and a sequence of the second bits to form an error-correction codeword providing error-correction capability.

    摘要翻译： 一种顺序数据存储介质，包括提供横向位置信息和纵向位置信息的多个伺服模式的序列，其中所述多个伺服模式中的每一个包括包括第一多个脉冲的第一脉冲串，包括第二多个脉冲的第二脉冲串 的脉冲，包括第三多个脉冲的第三脉冲串，以及包括第四多个脉冲的第四脉冲串。 所述第一多个脉冲之间的间隔与所述第二多个脉冲之间的间隔结合，对第一位进行编码，而不影响横向位置信息的恢复。 第三多个脉冲之间的间隔与第四多个脉冲之间的间隔结合，对第二位进行编码，而不影响横向位置信息的恢复。 多个伺服模式的序列包括第一比特的序列和第二比特的序列，以形成提供纠错能力的纠错码字。

    Servo channel for tape drive systems
    6.
    发明授权
    Servo channel for tape drive systems 有权
    磁带驱动系统的伺服通道

    公开(公告)号：US07742254B2

    公开(公告)日：2010-06-22

    申请号：US11969184

    申请日：2008-01-03

    申请人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Robert Allen Hutchins ,  Jens Jelitto

    发明人： Giovanni Cherubini ,  Roy Daron Cideciyan ,  Evangelos S. Eleftheriou ,  Robert Allen Hutchins ,  Jens Jelitto

    IPC分类号： G11B5/584

    CPC分类号： G11B5/584

    摘要： Provided are techniques for synchronous servo channel for a data tape drive. A servo reader is configured to read servo bursts from a data tape. An anti-aliasing filter is operable to output a bandlimited signal and is coupled to receive a servo channel signal comprising servo bursts from the servo reader. An analog-to-digital converter (ADC) is operable to output signal samples and is coupled to receive the bandlimited signal from the anti-aliasing filter. An interpolation and control unit is operable to output interpolated signal samples and control signals, has a first input coupled to receive the signal samples from the ADC, and has a second input coupled to receive the correlation signal samples from the dibit correlator. A dibit correlator is operable to output correlation signal samples and is coupled to receive the interpolated signal samples and control signals from the interpolation and control unit.

    摘要翻译： 提供了用于数据磁带驱动器的同步伺服通道的技术。 伺服读取器被配置为从数据磁带读取伺服脉冲串。 抗混叠滤波器可操作以输出带限信号，并且耦合以接收包括来自伺服读取器的伺服脉冲串的伺服信道信号。 模数转换器（ADC）可操作以输出信号采样并被耦合以从抗混叠滤波器接收带限信号。 内插和控制单元可操作以输出内插信号样本和控制信号，具有耦合以从ADC接收信号样本的第一输入，并具有耦合以从双位相关器接收相关信号样本的第二输入。 双向相关器可操作以输出相关信号样本，并被耦合以从内插和控制单元接收内插的信号样本和控制信号。

    Word synchronization for servo read signals in tape drives
    7.
    发明授权
    Word synchronization for servo read signals in tape drives 有权
    磁带驱动器中伺服读取信号的字同步

    公开(公告)号：US08027111B2

    公开(公告)日：2011-09-27

    申请号：US12487050

    申请日：2009-06-18

    申请人： Roy Daron Cideciyan ,  Giovanni Cherubini ,  Evangelos S. Eleftheriou ,  Jens Jelitto

    发明人： Roy Daron Cideciyan ,  Giovanni Cherubini ,  Evangelos S. Eleftheriou ,  Jens Jelitto

    IPC分类号： G11B20/10

    CPC分类号： G11B5/584

    摘要： Methods and apparatus for detecting L-bit sync words occurring at N-bit intervals in PPM-encoded servo pattern read signals read in magnetic tape drives. A soft output detector processes the PPM-encoded servo pattern read signal to produce a series of soft output samples corresponding to respective bits encoded in the servo pattern. A sync word detector then produces block correlation values for respective positions of a sliding L-sample block in the series of soft output samples by (i) calculating at each block position bit correlation values indicating correlation between respective samples and corresponding bits of the sync word and (ii) summing each bit correlation value minus a predetermined function of the corresponding sample value. The sync word detector then detects a sync word at the block position with the maximum block correlation value in an (N+L−1)-sample sequence of the series of soft output samples.

    摘要翻译： 用于检测在磁带驱动器中读取的PPM编码的伺服模式读取信号中以N位间隔发生的L位同步字的方法和装置。 软输出检测器处理PPM编码的伺服模式读取信号以产生与伺服模式中编码的各个位对应的一系列软输出样本。 同步字检测器然后通过以下步骤产生一系列软输出样本中的滑动L样本块的相应位置的块相关值：（i）在每个块位置计算指示相应采样和同步字的相应位之间的相关性的位相关值 和（ii）将每个比特相关值减去减去对应样本值的预定函数。 同步字检测器随后在软输出样本序列的（N + L-1） - 采样序列中检测具有最大块相关值的块位置处的同步字。

    Method and apparatus for viterbi detection of generalized partial response signals using partial matched filter and matched filter metrics
    9.
    发明授权
    Method and apparatus for viterbi detection of generalized partial response signals using partial matched filter and matched filter metrics 有权
    使用部分匹配滤波器和匹配滤波器度量的维特比检测广义部分响应信号的方法和装置

    公开(公告)号：US06377635B1

    公开(公告)日：2002-04-23

    申请号：US09697467

    申请日：2000-10-26

    申请人： Roy Daron Cideciyan ,  Jonathan Darrel Coker ,  Evangelos S. Eleftheriou ,  Richard Leo Galbraith ,  David James Stanek

    发明人： Roy Daron Cideciyan ,  Jonathan Darrel Coker ,  Evangelos S. Eleftheriou ,  Richard Leo Galbraith ,  David James Stanek

    IPC分类号： H03D100

    CPC分类号： H04L1/0054 ,  H04L25/497

    摘要： Methods and apparatus are provided for implementing high-speed and area efficient architectures for Viterbi detection of generalized partial response signals using both partial matched filter and matched filter metrics. In the method of the invention, branch metric terms are transformed to shift all time varying terms and some constant terms after an add compare select (ACS) unit. The total number of non-zero constants on trellis branches is minimized. The shifted time varying terms and the shifted constant terms are added directly to state metric terms. The time varying terms are expressed as outputs Zn of a partial matched filter or as outputs Wn of a matched filter. For a given generalized partial response target, the time-invariance property of the Viterbi detector enables identifying the minimum number of non-zero constants on trellis branches without resorting to heuristics. The time-invariance property holds for Viterbi detectors that process multiple samples per trellis-branch, thus allowing implementations at any desired speed.

    摘要翻译： 提供了用于实现高速和区域有效的架构的方法和装置，用于使用部分匹配滤波器和匹配滤波器度量来维持广义部分响应信号的维特比检测。 在本发明的方法中，在加法比较选择（ACS）单元之后，分支度量项被变换以移位所有时变项和一些常数项。 网格分支上的非零常数的总数最小化。 移位的时变项和移位的常数项直接添加到状态度量项。 时变项表示为部分匹配滤波器的输出Zn或匹配滤波器的输出Wn。 对于给定的广义部分响应目标，维特比检测器的时间不变特性使得能够在不采用启发式的情况下识别网格分支上的非零常数的最小数量。 维特比检测器的时不变性属性适用于每个网格分支处理多个样本，从而允许以任何所需速度进行实现。