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公开(公告)号：GB2581108A
公开(公告)日：2020-08-05
申请号：GB202007886
申请日：2018-10-25
Applicant: IBM
Inventor： KAZUHIRO TSURUTA , NHAN XUAN BUI , GIOVANNI CHERUBINI , SIMEON FURRER , MARK ALFRED LANTZ
IPC: G11B5/584
Abstract: A tape drive-implemented method includes: determining a servo band configuration of servo bands on a magnetic tape, using servo readers on a magnetic tape head to read one or more of the servo bands based on the determined servo band configuration, and using information read from the one or more of the servo bands to position the magnetic tape head relative to the magnetic tape. An array of data transducers is positioned along the magnetic tape head, the array extending perpendicular to a direction of travel of the magnetic tape. Moreover, a group of the servo readers is positioned at each end of the array of data transducers, and a distance between each of the immediately adjacent servo readers in each of the groups of servo readers is less than or equal to one third of a prespecified width of each of the servo bands.
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公开(公告)号：MY124046A
公开(公告)日：2006-06-30
申请号：MYPI20002027
申请日：2000-05-10
Applicant: IBM
Inventor： NHAN XUAN BUI , GLEN ALAN JAQUETTE , KAZUHIRO TSURUTA , JOHN ALEXANDER KOSKI
IPC: G11B27/28 , G11B27/32 , G11B15/087 , G11B27/10 , G11B27/36
Abstract: A SYSTEM AND METHOD FOR PRECISELY REGISTERING AND SYNCHRONIZING DATA SETS ON A RECORDING MEDIA HAVING A PRERECORDED SERVO PATTERN.THE RECORDING MEDIA IS SUBJECT TO CONTINUING MOVEMENT FOR READING AND/OR WRITING THE DATA SETS, INTERRUPTED BY STOPPING AT THE END OF A SELECTED DATA SET AND RESTARTING. DURING THE CONTINUING MOVEMENT OF THE RECORDING MEDIA, A DETECTOR (102) COUPLED TO THE SERVO SYSTEM CONTINUOUSLY READS LINEAR POSITION REGISTRATION DATA MODULATED INTO THE PRERECORDED SERVO PATTERN. AN INTERPOLATOR (106) INTERPOLATES THE PRERECORDED REGISTRATION DATA TO PROVIDE PRECISION REGISTRATION INFORMATION FOR THE DATA SETS. UPON THE DRIVE (12) STOPPING THE RECORDING MEDIA, THEN BACK HITCHING THE MEDIA AND THE MOVEMENT RESTARTING, SELECTED READ AND INTERPOLATED REGISTRATION INFORMATION IS PROVIDED. THE DETECTOR AGAIN READS AND INTERPOLATES THE PRERECORDED REGISTRATION DATA, AND A COMPARATOR (150) COMPARES THE AGAIN READ AND INTERPOLATED REGISTRATION INFORMATION TO THE PROVIDED READ AND INTERPOLATED REGISTRATION INFORMATION AND ANY PREDETERMINED OFFSET, AND INDICATES A COMPARISON MATCH. A DATA FORMATTER (54) COUPLED TO THE COMPARATOR, RESPONSIVE TO THE COMPARISION MATCH INDICATION, SYNCHRONIZES THE READING AND/OR WRITING OF DATA SETS ON THE RECORDING MEDIA.(FIG 10)
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公开(公告)号：GB2496553B
公开(公告)日：2016-12-14
申请号：GB201302780
申请日：2011-07-14
Applicant: IBM
Inventor： REED ALAN HANCOCK , RANDY CLARK INCH , NHAN XUAN BUI , KAZUHIRO TSURUTA , EIJI OGURA , SHUHEI NADE-HARA
Abstract: In accordance with the present invention, a method of operating a magnetic tape drive, a magnetic tape drive and a servo control system are provided for obtaining and maintaining velocity control in a magnetic tape drive. In one embodiment, a method is provided for operating a magnetic tape drive. The tape drive includes a plurality of DC motors, and each DC motor has a plurality of Hall sensors. The DC motors are under the control of a servo system which is configured to read location information from the magnetic tape, and compute a primary tape velocity from the location information, and sense a secondary and tertiary velocity signal and compute a tape velocity based on one of the sensed secondary velocity signal and tertiary velocity. The method includes detecting if the primary velocity location information is available. In response to detecting that the primary velocity location information is available the primary velocity is employed to control the servo system. In response to detecting the primary velocity location information is unavailable then one of a secondary or a tertiary velocity signal is employed. The secondary velocity signal is employed when an absolute value of a term related to tape velocity is less than a predetermined value. The tertiary velocity signal is employed when the absolute value of the term related to tape velocity is greater than the predetermined value.
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公开(公告)号：SG91275A1
公开(公告)日：2002-09-17
申请号：SG200002521
申请日：2000-05-09
Applicant: IBM
Inventor： NHAN XUAN BUI , JUNICHI FUKUDA , GLEN ALAN JAQUETTE , JOHN ALEXANDER KOSKI , KAZUHIRO TSURUTA
Abstract: Disclosed are a method and a detector for adaptively detecting servo gaps in a timing based servo pattern (50) prerecorded on a variable velocity media. The timing based servo pattern has groups of repeated pairs of non-parallel transition stripes arranged in bursts (52,54,55), the bursts separated by servo gaps whose (70-75) length is variable. A servo system sensor (26) senses the transition stripes in the longitudinal direction of the media. A group interval detector coupled to the sensor detects the timing interval between the same slope transition stripes of two sequential groups of bursts (BX,BY). A divider (170) divides the detected group timing interval by a predetermined divisor to provide a divided timing interval gap detection threshold (181). A sequential stripe interval detector coupled to the sensor measures the timing interval between stripes, and a comparator (110) compares the divided timing interval and the timing interval, identifying a servo gap upon the measured timing interval at least equaling the gap threshold. The detector responds to "valid" signals (BXOK,BYOK) which indicate the validity of the detected group timing interval, repeating operation of the divider to update the gap threshold, and repeating operation of the comparator with the updated gap threshold to continue to identify the servo gaps.
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公开(公告)号：GB2578076B
公开(公告)日：2021-05-26
申请号：GB202000832
申请日：2018-06-20
Applicant: IBM
Inventor： ANGELIKI PANTAZI , GIOVANNI CHERUBIN , TOMOKO TAKETOMI , NHAN XUAN BUI , MARK ALFRED LANTZ
Abstract: Embodiments of the present invention provide a tape transport control system with enhanced regulation of tape tension and velocity over the entire length of the tape. The tape transport control system comprises of circuitry adapted to output and circuitry adapted to receive one or more signals representing a tape velocity, at least one radius of either the first tape reel or the second tape reel, and a tape tension, and based on the received signals, generate at least one control signal to control at least one of the first reel motor or the second reel motor so as to reduce a tension disturbance at a minimum, one frequency corresponding to a time-varying reel-rotation frequency, based on controller parameters that depend on the tape velocity and on the at least one radius of either the first tape reel or the second tape reel.
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Patent Agency Ranking
公开(公告)号：GB2578076A
公开(公告)日：2020-04-15
申请号：GB202000832
申请日：2018-06-20
Applicant: IBM
Inventor： ANGELIKI PANTAZI , GIOVANNI CHERUBIN , TOMOKO TAKETOMI , NHAN XUAN BUI , MARK ALFRED LANTZ
Abstract: Embodiments of the present invention provide a tape transport control system with enhanced regulation of tape tension and velocity over the entire length of the tape. The tape transport control system comprises of circuitry adapted to output and circuitry adapted to receive one or more signals representing a tape velocity, at least one radius of either the first tape reel or the second tape reel, and a tape tension, and based on the received signals, generate at least one control signal to control at least one of the first reel motor or the second reel motor so as to reduce a tension disturbance at a minimum, one frequency corresponding to a time-varying reel-rotation frequency, based on controller parameters that depend on the tape velocity and on the at least one radius of either the first tape reel or the second tape reel.
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公开(公告)号：MY127261A
公开(公告)日：2006-11-30
申请号：MYPI20012652
申请日：2001-06-06
Applicant: IBM
Inventor： NHAN XUAN BUI , KAZUHIRO TSURUTA , JOHN ALEXANDER KOSKI , AKIMITSU SASAKI
Abstract: A SERVO SYSTEM (170) AND METHOD POSITION A HEAD LATERALLY WITH RESPECT TO DEFINED SERVO TRACKS, EMPLOYING FINE AND COARSE ACTUATORS (180, 182). A SERVO CONTROL INTEGRATES THE POSITION ERROR BETWEEN THE HEAD AND A DESIRED POSITION IN ACCORDANCE WITH A PREDETERMINED FUNCTION, AND OPERATES THE COARSE ACTUATOR TO TRANSLATE THE FINE ACTUATOR AND THE HEAD IN ACCORDANCE WITH THE INTEGRATED POSITION ERROR. A POSITION ERROR SIGNAL LOOP IS COUPLED TO A SERVO SENSOR (171) FOR DETERMINING POSITION ERROR FOR OPERATING THE FINE ACTUATOR TO TRANSLATE THE HEAD IN A MANNER TO REDUCE THE POSITION ERROR. THE POSITION ERROR SIGNAL LOOP MAY HAVE A COMPENSATOR FUNCTION (185) WITH BOTH INTEGRATION AND OTHER FUNCTIONS. A COARSE SERVO CONTROL COMPRISES A CONNECTION COUPLED TO THE COMPENSATOR FUNCTION FOR PROVIDING AN INTEGRATION CONTROL REPRESENTING THE INTEGRATION FUNCTION OF THE POSITION ERROR SIGNAL LOOP; AND A DRIVER (211) COUPLED TO THE CONNECTION, OPERATING THE COARSE ACTUATOR TO TRANSLATE THE FINE ACTUATOR AND THE HEAD IN ACCORDANCE WITH THE INTEGRATION SIGNAL. (FIG. 6)
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公开(公告)号：SG85717A1
公开(公告)日：2002-01-15
申请号：SG200004134
申请日：2000-07-24
Applicant: IBM
Inventor： NHAN XUAN BUI , JUNICHI FUKUDA , GLEN ALAN JAQUETTE , JOHN ALEXANDER KOSKI , KAZUHIRO TSURUTA
Abstract: A detector and method for detecting data modulated into a timing based servo pattern prerecorded on a media, comprising shifts of pairs of non-parallel transition stripes arranged in a frame of two bursts. Timing intervals between sequential transition stripes are detected. Interval comparison logic compares selected timing intervals and indicates whether the compared intervals represent a "0", or a "1". First and second counters respectively increment the number of the compared intervals representing a "0" and representing a "1" in each frame. Bit comparison logic compares, for each frame, the incremented numbers representing a "0" and a "1" to a predetermined criteria and, upon one of the numbers meeting the criteria, identifies the corresponding "0" or "1" as the bit value for the frame. The bits are data comprising longitudinal position words arranged in a linear sequence. Sequence logic calculates the next sequential position word from an immediately preceding word and determines whether the detected word is in the linear sequence as a validity check, and provides the calculated word as the output. Thus, the correct position word is provided at the output even if the detected word is invalid.
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公开(公告)号：GB2487135B
公开(公告)日：2018-05-09
申请号：GB201200428
申请日：2010-09-13
Applicant: IBM
Inventor： ANGELIKI PANTAZI , EVANGELOS ELEFTHERIOU , JENS JELITTO , NHAN XUAN BUI
IPC: G11B5/584
Abstract: Various embodiments for addressing time-varying periodic disturbances in a servo control system are provided. Each of a plurality of coefficients is updated based on an estimation of at least one disturbance frequency. The updated plurality of coefficients is provided to at least one peak filter modifying an input signal of the servo control system. The peak filter is operable in view of the updated plurality of coefficients to cancel at least one of the time-varying periodic disturbances.
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公开(公告)号：MY126603A
公开(公告)日：2006-10-31
申请号：MYPI20003412
申请日：2000-07-26
Applicant: IBM
Inventor： NHAN XUAN BUI , GLEN ALAN JAQUETTE , JUNICHI FUKUDA , KAZUHIRO TSURUTA , JOHN ALEXANDER KOSKI
Abstract: A DETECTOR AND METHOD FOR DETECTING DATA MODULATED INTO A TIMING BASED SERVO PATTERN PRERECORDED ON A MEDIA, COMPRISING SHIFTS OF PAIRS OF NON-PARALLEL TRANSITION STRIPES ARRANGED IN A FRAME TWO BURSTS. TIMING INTERVALS BETWEEN SEQUENTIAL TRANSITION STRIPES ARE DETECTED. INTERVAL COMPARISON LOGIC COMPARES SELECTED TIMING INTERVALS AND INDICATES WHETHER THE COMPARED INTERVALS REPRESENT A "0" OR A "1". FIRST AND SECOND COUNTERS RESPECTIVELY INCREMENT THE NUMBER OF THE COMPARED INTERVAL REPRESENTING A "0" AND REPRESENTING A "1" IN EACH FRAME. BIT COMPARISONLOGIC COMPARES, FOR EACH FRAME, THE INCREMENTED NUMBERS REPRESENTING A "0" AND A "1" TO A PREDETERMINED CRITERIA AND, UPON ONE OF THE NUMBER MEETING THE CRITERIA, IDENTIFIES THE CORRESPONDING "0" OR "1" AS THE BIT VALUE FOR THE FRAME. THE BITS ARE DATA COMPRISING LONGTUDINAL POSITION WORDS ARRANGED IN A LINEAR SEQUENCE. SEQUENCE LOGIC CALCULATES THE NEXT SEQUENTIAL POSITION WORD FROM AN IMMEDIATELY PRECEDING WORD AND DETERMINES WHETHER THE DETECTED WORD IS IN THE LINEAR SEQUENCE AS A VALIDITY CHECK, AND PROVIDED THE CALCULATED WORD AS THE OUTPUT.THUS, THE CORRECT POSITION WORD IS PROVIDED AT THE OUTPUT EVEN IF THE DETECTED WORD IS INVALID.FIGURE 6
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