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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：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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公开(公告)号：SG109018A1
公开(公告)日：2005-02-28
申请号：SG200404686
申请日：2004-07-29
Applicant: IBM
Inventor： NHAN XUAN BUI , JAMES HOWARD EATON , JUNICHI FUKUDA , GLEN ALAN JAQUETTE , EIJI OGURA , MARK ALLAN TAYLOR , KAZUHIRO TSURUTA
Abstract: In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to patterns of another of the separate servo bands. The differentiating characteristic allows identification of the separate servo bands. For example, the patterns of a separate servo band have differing azimuthal orientations of detectable transitions with respect to another servo band, such as being laterally inverted. In another, variations in the width of gaps of patterns are made with respect to another servo band. In another, variations are made in the number of the detectable transitions of patterns with respect to the patterns of another servo band.
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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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