公开(公告)号：CA1079846A

公开(公告)日：1980-06-17

申请号：CA268527

申请日：1976-12-22

Applicant: IBM

Inventor： DENNISON JAMES C ,  OTTESEN HJALMAR H

IPC: G11B21/08 ,  G11B5/596 ,  G11B21/10 ,  G11B5/58 ,  G11B17/00

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：FR2347742A1

公开(公告)日：1977-11-04

申请号：FR7634824

申请日：1976-11-12

Applicant: IBM

Inventor： DENNISON JAMES C ,  OTTESEN HJALMAR H

IPC: G11B5/596 ,  G11B21/10 ,  G11B21/08 ,  G11B5/58 ,  G06K7/015

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.