公开(公告)号：CA2717616C

公开(公告)日：2017-04-11

申请号：CA2717616

申请日：2009-06-09

Applicant: IBM

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

IPC: G11B5/584

Abstract: Methods and apparatus are provided for detecting L-bit sync words occurring at N-bit intervals in PPM-encoded servo pattern read signals read from magnetic tape (3) in tape drives (1). A soft output detector (11) 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 (12) then produces block correlation values for respective positions of a sliding L-sample block in the soft output sample series. The block correlation values are produced by calculating, at each block position, bit correlation values indicating correlation between respective samples and corresponding bits of the sync word, and summing each bit correlation value minus a predetermined function of the corresponding sample value. The sync word detector (12) then detects a sync word at the block position with the maximum block correlation value in an (N+L-1)-sample sequence of the soft output sample series.

公开(公告)号：GB2530788A

公开(公告)日：2016-04-06

申请号：GB201417461

申请日：2014-10-02

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  HURLEY PAUL T ,  OECAL ORHAN

IPC: H04H60/41 ,  H01Q3/28 ,  H04B7/08

Abstract: A device for receiving signals by a plurality of receiving arrays, particularly large-scale radio telescope arrays, comprises: plural receiving (antenna) arrays 10, each including a respective number L1, L2,...,LL of receiving elements and generating time series output data signals based on received signals; a randomizing unit 20 to generate a randomized matrix W1, W2, W3 for each of the receiving arrays of the plural receiving arrays, each randomized matrix having a respective a dimensionality M 1, M2,...,ML, wherein M1

公开(公告)号：DE102012218531B4

公开(公告)日：2016-02-04

申请号：DE102012218531

申请日：2012-10-11

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  CIDECIYAN ROY DARON

IPC: G11B5/584

Abstract: Magnetbandmedium zum Speichern von Daten, aufweisend: – mindestens ein Servoband, das sich entlang des Magnetbandmediums erstreckt und Servodaten aufweist, um zu ermöglichen, dass eine seitliche Abweichung eines die Servodaten lesenden Servolesers von einer seitlichen Bezugsposition auf dem Servoband ermittelt wird, – in die Servodaten integrierte zusätzliche Daten, wobei die zusätzlichen Daten – durch ein M-näres Alphabet A codiert sind, das M > 2 unterschiedliche Symbole aufweist, – in einer Wortmenge angeordnet sind, wobei jedes Wort der Wortmenge enthält – eine Anzahl von p Symbolen Si mit 0 ≤ i 0 zum Darstellen von Synchronisationsdaten, wobei die Synchronisationsdaten eine Bezugsposition innerhalb des jeden Worts darstellen, wobei jedes Symbol, das zum Darstellen der Synchronisationsdaten verwendet wird, aus einer Menge B von m Symbolen stammt, wobei es sich bei der Menge B um eine echte Teilmenge der Symbole in dem Alphabet A handelt, sodass 1 ≤ m 0 zum Darstellen von Längspositionsdaten, wobei die Längspositionsdaten das Ableiten einer vorliegenden Längsposition auf dem Magnetbandmedium ermöglichen, wobei jedes Symbol, das zum Darstellen der Längspositionsdaten verwendet wird, aus einer Menge C von M – m Symbolen stammt, wobei es sich bei der Menge C um eine Ergänzungsmenge zur Menge B handelt, sodass das Alphabet A die Vereinigung der Symbole in den Mengen B und C ist und die Schnittmenge der Symbole in den Mengen B und C eine leere Menge ist; und – eine Anzahl von j Symbolen Ti mit 0 ≤ i 0 zum Darstellen anderer Daten, wobei jedes zum Darstellen der anderen Daten verwendete Symbol aus der Menge C von M – m Symbolen stammt; wobei die Symbole L0, ..., Lk-1 einen Längspositionswert ...

公开(公告)号：GB2517714A

公开(公告)日：2015-03-04

申请号：GB201315325

申请日：2013-08-29

Applicant: IBM

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

IPC: G11B5/584

Abstract: A tape storage medium TP comprising a servo band SB along a longitudinal extension x of the tape. The servo band comprises a set of servo tracks STx of width wST extending along the longitudinal extension of the tape and arranged next to each other. A total of two different servo patterns PN_A, PN_B are contained in the set of servo tracks and servo patterns of adjacent servo tracks are different from each other. A tape head comprises two servo readers SR1 and SR2 for reading the servo band. A width wSR1, wSR2 of each servo reader orthogonal to the longitudinal extension of the tape is at least half the width of a servo track. The two servo readers are offset oR from each other orthogonal to the longitudinal extension of the tape by d*wST+n*wST with 0

公开(公告)号：GB2516579A

公开(公告)日：2015-01-28

申请号：GB201419858

申请日：2013-04-24

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  PANTAZI ANGELIKI

IPC: G11B5/584

Abstract: An apparatus for operating a tape storage device comprises a first tape skew determination unit (DUS1) for providing a first tape skew value (DTS1) concerning a skew of a tape (TP) in the tape storage device, and a second tape skew determination unit (DUS2) for providing a second tape skew value (DTS2) concerning the skew of the tape (TP). An actuator (SA) adjusts one or more of a rotational orientation of a tape head (TH) of the tape storage device which tape head (TH) is provided for reading and/or writing data from/to the tape (TP), and a motion direction (TMD) of the tape (TP) dependent on the first tape skew value (DTS1) and the second tape skew value (DTS2).

公开(公告)号：GB2513179A

公开(公告)日：2014-10-22

申请号：GB201307094

申请日：2013-04-19

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  OGURA EIJI ,  PANTAZI ANGELIKI

IPC: G11B15/46 ,  G11B15/43

Abstract: A controller 100 controls the transport of a tape 208 within a tape transport system 200, the tape transport system 200 having a read/write head 203, inboard reel 207 and outboard reel 206. The control device is adapted to generate control signals 104, 105 to control the velocity of the outboard and inboard reels as a function of a primary velocity 101 of the tape at the head and a secondary velocity 102 of the tape at the inboard reel and/or a secondary velocity 112 of the tape at the outboard reel. The velocity of the supply reel may be controlled based on the primary velocity and the velocity of the take-up reel may be controlled based on the secondary velocity. The primary velocity may be measured at the head using servo track information SI. Hall sensors 201 and 202 can be arranged at the reels for measuring the secondary velocity and a further secondary velocity. Tension of the tape can also be controlled.

公开(公告)号：DE112012004103T5

公开(公告)日：2014-07-17

申请号：DE112012004103

申请日：2012-07-04

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  LANTZ ALFRED MARK

IPC: G11B5/584

Abstract: In einem Verfahren zum Betreiben eines Bandspeichersystems wird während des Bewegens eines Bandes (1) in einem Bandlaufwerk über einen Bandkopf (2) für eine oder mehrere Vorgänge des Lesens und Schreibens von Benutzerdaten aus einer/in eine Datenspur des Bandes (1) ein der Datenspur zugewiesenes Leseelement (R1) des Bandkopfes (2) quer zu einer Bewegungsrichtung (MD) des Bandes (1) um eine Strecke von mehr als einer Breite (w) der Datenspur bewegt. Eine Querposition (TP) von einem oder mehreren der folgenden Elemente ist abhängig von einem vom Leseelement (R1) während seiner Querbewegung gelieferten Signal: dem Leseelement (R1); einem anderen der Datenspur zugewiesenes Leseelement (R1); und einem der Datenspur zugewiesenen Schreibelement (W1).

公开(公告)号：GB2503483A

公开(公告)日：2014-01-01

申请号：GB201211473

申请日：2012-06-28

Applicant: IBM

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

IPC: G11B5/584 ,  G11B5/265

Abstract: A magnetic tape servo band comprises servo patterns organized in servo frames FR for determining positional information. The servo frames comprise a first burst A comprising at least two servo stripes 111 inclined at a first angle α followed by a second burst B comprising at least two servo stripes inclined at a second angle β with respect to a direction orthogonal to the longitudinal extension of the tape medium. The second angle being different to the first angle. At least one of the stripes of the first burst has a first magnetic polarity and at least one of the stripes of the second burst has a second magnetic polarity different from the first magnetic polarity. A servo write head has first and second ring structures with a gap in each ring structure where the magnetic flux is oriented in opposite direction across the gaps.

公开(公告)号：GB2495356A

公开(公告)日：2013-04-10

申请号：GB201212290

申请日：2012-07-11

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  JELITTO JENS ,  HUTCHINS ROBERT ALLEN

IPC: G11B5/584 ,  G11B20/10

Abstract: A tape drive system 700 includes a magnetic head having a servo sensor 702 to read servo pulses from servo bursts of a servo track. The servo bursts representing an encoded data symbol. An analog-to-digital converter 704 provides a sequence of samples of the read back servo signal. A digital correlator 708 computes a correlation signal between the sequence and a reference waveform. A timing reference module 714 provides a reference timing model having interpolation instants to the digital correlator. A correlation interpolator 710 interpolates the correlation signal at the interpolation instants and computes a longitudinal position (LPOS) detection metric. An LPOS detector 712 decodes the encoded data symbol of the servo bursts using the computed LPOS detection metric and estimates a reliability of the decoded data symbol. The system may include a servo signal interpolator 706. The system provides a signal to distortion ratio of the LPOS metric which is similar in the tape velocity range of 1 m/s to 12 m/s.

公开(公告)号：GB2490778A

公开(公告)日：2012-11-14

申请号：GB201207690

申请日：2011-02-18

Applicant: IBM

Inventor： HANCOCK REED ALAN ,  BUI NHAN XUAN ,  JELITTO JENS ,  CHERUBINI GIOVANNI ,  TSURUTA KAZUHIRO

IPC: G11B5/584

Abstract: An alternative time interval is taken of a timing based servo band to determine lateral position of a servo read head. The servo band is arranged in a sequence bursts with non- parallel servo stripes in sequentially adjacent sub-frames of a linear tape. The timing intervals comprise at least a first time interval (A) between a first pair of non-parallel servo stripes of a sub-frame; and an alternative time interval (C) between a pair of non-parallel servo stripes intermediate the first time intervals (A), the alternative interval servo stripes of sequentially adjacent sub-frames comprising a second servo stripe of the first pair, and a first servo stripe of a sequentially succeeding first pair. Position signals are ratios involving the first and second time intervals.