公开(公告)号：DE69029833D1

公开(公告)日：1997-03-13

申请号：DE69029833

申请日：1990-11-01

Applicant: IBM

Inventor： GLASER THOMAS WILLIAM ,  GREENBERG RICHARD ,  OTTESEN HJALMAR HOLMBOE

IPC: G06F3/06 ,  G06F11/20 ,  G11B19/12 ,  G11B19/28 ,  G11B20/12 ,  G11B27/00 ,  G11B27/10 ,  G11C29/00

公开(公告)号：DE2657266A1

公开(公告)日：1977-07-07

申请号：DE2657266

申请日：1976-12-17

Applicant: IBM

Inventor： DENNISON JAMES CLIFFORD ,  OTTESEN HJALMAR HOLMBOE

IPC: G11B21/08 ,  G11B5/596 ,  G11B21/10

Abstract: RECORD TRACK FOLLOWING AND SEEKING An improved servo block pattern bands a plurality of parallel record tracks into a track seek and follow band. Servo block positions in the record tracks, plus the longitudinal duration of the signal bursts enable simultaneous track seeking and following within a band of tracks. Servo apparatus operable with such patterns adapt to amplitude variations of the servo readback signal to reduce the effect of amplitude variations on servo performance. The servo blocks may have differing frequencies or correlation patterns for enhancing track seek and follow functions.

公开(公告)号：DE69029833T2

公开(公告)日：1997-07-17

申请号：DE69029833

申请日：1990-11-01

Applicant: IBM

Inventor： GLASER THOMAS WILLIAM ,  GREENBERG RICHARD ,  OTTESEN HJALMAR HOLMBOE

IPC: G06F3/06 ,  G06F11/20 ,  G11B19/12 ,  G11B19/28 ,  G11B20/12 ,  G11B27/00 ,  G11B27/10 ,  G11C29/00

公开(公告)号：DE68919884D1

公开(公告)日：1995-01-26

申请号：DE68919884

申请日：1989-03-28

Applicant: IBM

Inventor： OTTESEN HJALMAR HOLMBOE ,  NAKAGAWA YUZO ,  ONO SHYUNJI

IPC: G11B21/10 ,  G11B21/08 ,  H02P25/06

公开(公告)号：DE68919884T2

公开(公告)日：1995-07-13

申请号：DE68919884

申请日：1989-03-28

Applicant: IBM

Inventor： OTTESEN HJALMAR HOLMBOE ,  NAKAGAWA YUZO ,  ONO SHYUNJI

IPC: G11B21/10 ,  G11B21/08 ,  H02P25/06

公开(公告)号：DE2644013A1

公开(公告)日：1977-05-26

申请号：DE2644013

申请日：1976-09-30

Applicant: IBM

Inventor： OTTESEN HJALMAR HOLMBOE

IPC: G11B20/14 ,  G11B20/10 ,  G11B5/02

Abstract: A magnetic recorder employs a feedback phase equalizer for adjusting the readback signal to enhance detection capability. Phase errors are measured and used as criteria for dynamically and adaptively adjusting phase compensation of the read-back signal. In a preferred form, averaging phase errors over a predetermined signal characteristic of the readback signal controls adjustment of phase equalization.