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公开(公告)号：GB2283851B
公开(公告)日：1997-12-17
申请号：GB9422420
申请日：1994-11-07
Applicant: IBM
Inventor： CHEUNG WAYNE LEUNG , CHIANG CHENHUEI J , NGUYEN THINH
Abstract: A disk head position control system having a disk head controller that moves a disk head relative to a surface of a magnetic media disk encoded with a plurality of tracks of a quadrature burst pattern includes a burst pattern that comprises an asynchronous, multi-frequency track address code having burst pattern transitions that extend across the width of a track and are arranged in staggered fashion in alternate tracks such that no transitions between adjacent tracks are aligned in the disk radial direction.
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公开(公告)号：GB2284688A
公开(公告)日：1995-06-14
申请号：GB9423247
申请日：1994-11-17
Applicant: IBM
Inventor： MUELLER FRANCIS EDWARD , CHEUNG WAYNE LEUNG , LIU CHUNG CHUAN
Abstract: A digital servo control system for a disk drive provides asynchronous servo information signal demodulation. The system includes a digital demodulator having a digital squarer 164 that removes any phase component of the digitized servo information signal and includes a burst signal accumulator 168 that accumulates the squared terms according to respective burst timing intervals to produce a digital, quadrature position error signal (PES). The demodulator also can include a filter 154 comprising a harmonic notch filter preferably implemented as a Hilbert Transform filter. In another embodiment the demodulator does not include a filter and squarer and, instead, the squarer comprises a sum-and-squarer that sums the squares of odd and even digitized samples. A split burst servo pattern for the servo control system is comprised of half-width transitions that can be written in a single pass of a recording head and therefore has no phase misalignment between adjacent flux patterns.
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公开(公告)号：GB2284688B
公开(公告)日：1997-12-10
申请号：GB9423247
申请日：1994-11-17
Applicant: IBM
Inventor： MUELLER FRANCIS EDWARD , CHEUNG WAYNE LEUNG , LIU CHUNG CHUAN
Abstract: A digital servo control system for a disk drive provides asynchronous servo information signal demodulation. The system includes a digital demodulator having a digital squarer that removes any phase component of the digitized servo information signal and includes a burst signal accumulator that accumulates the squared terms according to respective burst timing intervals to produce a digital, quadrature position error signal (PES). The demodulator also can include a filter comprising a harmonic notch filter preferably implemented as a Hilbert Transform filter. Alternatively, the demodulator does not include a filter and squarer and, instead, the squarer comprises a sum-and-squarer that sums the squares of odd and even digitized samples. A split burst servo pattern for the servo control system is comprised of half-width transitions that can be written in a single pass of a recording head and therefore has no phase misalignment between adjacent flux patterns.
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公开(公告)号：GB2283851A
公开(公告)日：1995-05-17
申请号：GB9422420
申请日：1994-11-07
Applicant: IBM
Inventor： CHEUNG WAYNE LEUNG , CHIANG CHENHUEI J , NGUYEN THINH
Abstract: A disk head position control system having a disk head controller that moves a disk head relative to a surface of a magnetic media disk encoded with a plurality of tracks of a quadrature burst pattern includes a burst pattern that comprises an asynchronous, multi-frequency track address code having burst pattern transitions that extend across the width of a track and are arranged in staggered fashion in alternate tracks such that no transitions between adjacent tracks are aligned in the disk radial direction.
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