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    SERVO PATTERN OF A TAPE STORAGE MEDIUM
    1.
    发明申请
    SERVO PATTERN OF A TAPE STORAGE MEDIUM 审中-公开
    磁带存储介质的伺服模式

    公开(公告)号：WO2014083508A3

    公开(公告)日：2014-07-24

    申请号：PCT/IB2013060436

    申请日：2013-11-27

    Applicant: IBM ,  IBM RES GMBH

    Inventor： CHERUBINI GIOVANNI ,  ENGELEN JOHAN B C ,  FURRER SIMEON ,  JELITTO JENS ,  LANTZ MARK ALFRED

    IPC: G11B5/584

    CPC classification number: G11B5/584

    Abstract: A tape storage medium comprises at least one servo band (SB) along a longitudinal extension (x) of the tape storage medium (TP) for supporting to determine positional information. The servo band (SB) comprises a first servo subband (SB1) extending along the longitudinal extension (x) of the tape storage medium (1) and a second servo subband (SB2) extending along the longitudinal extension (x) of the tape storage medium (TP) next to the first servo subband (SB1). The first servo subband (SB1) comprises a frame servo pattern containing a set of servo frames (FR), wherein each servo frame (FR) of the set comprises a first burst (A) comprising at least two servo stripes (SP1) inclined at a first angle ( α) with respect to a direction orthogonal to the longitudinal extension (x) of the tape medium (TP), followed by a second burst (B) comprising at least two servo stripes (SP2) inclined at a second angle (&bgr;) with respect to the direction orthogonal to the longitudinal extension (x) of the tape medium (TP), which second angle (α) is different from the first angle (&bgr;). The second servo subband (SB2) contains a set of servo tracks (STx) extending along the longitudinal extension (x) of the tape storage medium (TP) and arranged next to each other, wherein each servo track (STx) of the set contains a servo pattern of magnetic transitions representing a waveform when being read, and wherein the waveforms of adjacent servo tracks (STx) are orthogonal to each other.

    Abstract translation: 磁带存储介质包括沿着磁带存储介质（TP）的纵向延伸（x）的至少一个伺服带（SB），用于支持确定位置信息。 伺服带（SB）包括沿带存储介质（1）的纵向延伸（x）延伸的第一伺服子带（SB1）和沿着带存储器（1）的纵向延伸（x）延伸的第二伺服子带 介质（TP）紧挨着第一伺服子带（SB1）。 第一伺服子带（SB1）包括含有一组伺服帧（FR）的帧伺服模式，其中该组的每个伺服帧（FR）包括第一脉冲串（A），该第一脉冲串包括至少两个伺服条纹（SP1） （TP）的与纵向延伸（x）正交的方向的第一角度（α），接着是包括以第二角度倾斜的至少两个伺服条纹（SP2）的第二脉冲（B）（ （α）与第一角度（β）不同的正交于带式介质（TP）的纵向延伸（x）的方向）。 第二伺服子频带（SB2）包含沿着磁带存储介质（TP）的纵向延伸（x）延伸并且彼此相邻排列的一组伺服磁道（STx），其中该组的每个伺服磁道（STx）包含 当读取时表示波形的磁转变的伺服模式，并且其中相邻伺服轨道（STx）的波形彼此正交。

    SERVO CONTROL IN TAPE DRIVES
    6.
    发明申请
    SERVO CONTROL IN TAPE DRIVES 审中-公开
    磁带驱动器中的伺服控制

    公开(公告)号：WO2009153740A3

    公开(公告)日：2010-02-25

    申请号：PCT/IB2009052577

    申请日：2009-06-17

    Applicant: IBM ,  CHERUBINI GIOVANNI ,  JELITTO JENS ,  LANTZ MARK A

    Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  LANTZ MARK A

    IPC: G11B5/58 ,  G11B15/43

    CPC classification number: G11B5/58 ,  G11B5/596 ,  G11B15/093 ,  G11B15/43

    Abstract: Servo control methods and apparatus are provided for a tape drive (1) where a read/write head (2) reads and writes data on magnetic tape (3) with at least one servo track for providing transversal position information. At least two servo readers (S) are associated with the read/write head (2), each arranged for reading a said servo track during read/write operations. The servo readers (S) are operative concurrently to generate respective servo read signals (r). A position estimator (8) processes each servo read signal (r) to generate a series of position values, corresponding to respective time instants, indicative of transversal position of the associated servo reader (S). A servo controller (10) calculates from the position values and time instants a skew value (?), indicative of tape skew relative to the read/write head (2), and a tension variation value (AT) indicative of variation of tape tension from a reference value. The servo controller (10) is adapted to account for cross-coupling between tape skew and tension variation in the joint calculation of the skew and tension variation values. Where three servo readers (S) are operative concurrently, the servo controller (10) can be adapted to account for time dependency of tape skew and tension variation and to calculate respective time derivatives (?\ AT') for the skew and tension variation values (?, AT). The calculated values can then be used to make compensatory adjustments to tape tension and tape skew relative to the read/write head (2).

    Abstract translation: 为磁带驱动器（1）提供伺服控制方法和装置，其中读/写磁头（2）用至少一个用于提供横向位置信息的伺服磁道读取和写入磁带（3）上的数据。 至少两个伺服读取器（S）与读/写头（2）相关联，每个伺服读取器（S）被布置用于在读/写操作期间读取所述伺服轨道。 伺服读取器（S）同时工作以产生相应的伺服读取信号（r）。 位置估计器（8）处理每个伺服读取信号（r）以产生指示相关伺服读取器（S）的横向位置的对应于各个时刻的一系列位置值。 伺服控制器（10）根据位置值和时刻计算指示相对于读/写头（2）的磁带偏斜的偏斜值（θ）和指示磁带张力变化的张力变化值（AT） 从参考值。 伺服控制器（10）适于考虑歪斜和张力变化值的联合计算中的带偏斜和张力变化之间的交叉耦合。 在三个伺服读取器（S）同时操作的情况下，伺服控制器（10）可以适应于考虑到磁带歪斜和张力变化的时间依赖性，并且计算歪斜和张力变化值的相应时间导数（Δ\ AT'） （？， 在）。 然后，计算的值可用于对磁带张力和相对于读/写磁头（2）的磁带歪斜进行补偿性调整。

    HEAD DESIGN FOR WRITING SERVO PATTERNS ON MAGNETIC TAPE
    7.
    发明申请
    HEAD DESIGN FOR WRITING SERVO PATTERNS ON MAGNETIC TAPE 审中-公开
    在磁带上书写伺服模式的主要设计

    公开(公告)号：WO2009136374A3

    公开(公告)日：2009-12-30

    申请号：PCT/IB2009051882

    申请日：2009-05-07

    Applicant: IBM ,  CHERUBINI GIOVANNI ,  CIDECIYAN ROY D ,  ELEFTHERIOU EVANGELOS S ,  JELITTO JENS ,  LANTZ MARK A

    Inventor： CHERUBINI GIOVANNI ,  CIDECIYAN ROY D ,  ELEFTHERIOU EVANGELOS S ,  JELITTO JENS ,  LANTZ MARK A

    IPC: G11B5/584 ,  G11B21/10

    CPC classification number: G11B5/584

    Abstract: A servo write head is provided and is configured to simultaneously write at least two servo patterns in respective servo bands on linear magnetic tape. Centerlines of the servo patterns are substantially uniformly spaced in the lateral direction. In addition, the servo patterns of all adjacent respective servo bands are displaced relative to each other in a longitudinal direction by an amount that is related to a length of a servo frame and a type of the servo patterns.

    Abstract translation: 伺服写入头被提供并被配置为在线性磁带上的相应伺服带中同时写入至少两个伺服模式。 伺服图案的中心线在横向上基本均匀地间隔开。 另外，所有相邻的各个伺服带的伺服图案在纵向上相对于彼此移位与伺服帧的长度和伺服图案的类型有关的量。

    SYNCHRONIZATION OF SYMMETRIC TIMING BASED SERVO BURSTS
    8.
    发明申请
    SYNCHRONIZATION OF SYMMETRIC TIMING BASED SERVO BURSTS 审中-公开
    基于对称时序的伺服脉冲同步

    公开(公告)号：WO2011104050A2

    公开(公告)日：2011-09-01

    申请号：PCT/EP2011050674

    申请日：2011-01-19

    Applicant: IBM ,  CHERUBINI GIOVANNI ,  JELITTO JENS ,  LANTZ MARK ALFRED ,  HUTCHINS ROBERT ALLEN

    Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  LANTZ MARK ALFRED ,  HUTCHINS ROBERT ALLEN

    CPC classification number: G11B5/584 ,  G11B5/09

    Abstract: Timing based servo bursts of servo frames, in which the frames are arranged to be symmetric with the same number of servo stripes in each burst of a frame, are synchronized by shifting selected bits. For example, servo frames are arranged with four servo bursts with an equal number of servo stripes in each burst, the servo frames comprising two symmetric sub-frames, each sub-frame comprising two bursts of servo stripes that are parallel to each other within a burst, and the bursts are non-parallel with respect to each other; each servo burst is arranged to comprise at least one reference servo stripe; and each servo burst is arranged to comprise at least one shifted servo stripe, wherein the shift is in the same longitudinal direction with respect to at least one reference servo stripe for each burst of a frame and the opposite longitudinal direction for bursts of sequentially adjacent frames.

    Abstract translation: 伺服帧的基于时序的伺服脉冲串通过移位所选位来同步，其中帧被布置为在帧的每个突发中具有相同数量的伺服条带对称。 例如，伺服帧被布置成具有在每个突发中具有相等数量的伺服条带的四个伺服脉冲串，伺服帧包括两个对称子帧，每个子帧包括在一个内部的彼此平行的两个脉冲串的伺服条带 突发，并且突发是相互不平行的; 每个伺服脉冲串被布置成包括至少一个参考伺服条纹; 并且每个伺服脉冲串被布置成包括至少一个移位的伺服条带，其中相对于帧的每个脉冲串相对于至少一个参考伺服条带的移位在相同的纵向方向上，并且相反的纵向方向用于顺序相邻帧的突发 。

    CONTROL METHOD AND APPARATUS FOR A DUAL-CHANNEL WEIGHTED LPOS COMBINING SCHEME
    10.
    发明专利
    CONTROL METHOD AND APPARATUS FOR A DUAL-CHANNEL WEIGHTED LPOS COMBINING SCHEME 未知

    公开(公告)号：CA2765148C

    公开(公告)日：2017-09-19

    申请号：CA2765148

    申请日：2010-06-02

    Applicant: IBM

    Inventor： JELITTO JENS ,  CHERUBINI GIOVANNI ,  HUTCHINS ROBERT ALLEN ,  SANDBERG MELANIE JEAN

    IPC: G11B5/584

    Abstract: A method for monitoring a plurality of servo channels, providing a finite state machine ("FSM") comprising a single servo channel mode and a combined servo channel mode, and moving a sequential information storage medium comprising a plurality of servo bands across a read/write head comprising a corresponding plurality of servo sensors. The method further asserts an acquisition flag by a servo channel if that servo channel is tracking a servo pattern, and asserts a bit flag by a servo channel if a new LPOS bit is decoded. If at least one acquisition flag is asserted, the method determines if a bit flag is asserted by a servo channel associated with said asserted acquisition flag, and if an acquisition flag and a bit flag are asserted by a servo channel, the method determines a relative positioning of each servo sensor with respect to an associated servo pattern.

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