Servo tracking for helical scan recorder

Details Servo tracking for helical scan recorder Servo tracking for helical scan recorder

1989-11-09

1991-11-26

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 5588

Patent

active

050687573

ABSTRACT:
In a servo tracking method and apparatus, a servo head (S) of a helical scan recorder (30) endeavors to travel equidistant between two servo signal-bearing stripes recorded on the tape (32). The recorder (30) determines a reference-crossing time at which the servo head (S) begins to cross a horizontal reference line (606) drawn with respect to the beginning of a stripe on the tape (32). The servo head (S) samples the amplitude of a servo signal provided on the tape (32) at a plurality of predetermined times after the reference-crossing time. A servo tracking circuit (175) uses the amplitude of the servo signal at the predetermined sampling times to determine how to adjust the position of said head (S) relative to the pitch of said stripe.

REFERENCES:
patent: 4651239 (1987-03-01), Omori et al.
patent: 4665447 (1987-05-01), Odaka
patent: 4677504 (1987-06-01), Yamazaki
patent: 4714971 (1987-12-01), Sigiki et al.
patent: 4739420 (1988-04-01), Odaka et al.
patent: 4835628 (1989-05-01), Hinz et al.
patent: 4843495 (1989-06-01), Georgis
patent: 4845577 (1989-07-01), Georgis et al.

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