Multitransducer head positioning servo for use in a bi-direction

Details Multitransducer head positioning servo for use in a bi-direction Multitransducer head positioning servo for use in a bi-direction

1989-09-19

1992-06-09

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 49, 360 7712, 360134, G11B 558, G11B 578

Patent

active

051212706

ABSTRACT:
In a multichannel recording/playback apparatus, a bi-directional transport longitudinally moves a magnetic tape past a multitransducer magnetic head for recording and/or playback. The magnetic head is positionable to selected tracks in a stepwise manner across the width of the tape. A head positioning servo utilizes binary patterns pre-recorded on the tape, consisting of magnetized blocks and non magnetized blocks which are read by a servo transducer integral with the multitransducer head stack. For each centerline corresponding to a specified track location, the servo tranducer straddles the line between adjacent, longitudinally recorded patterns and when the servo transducer is "on track" two conditions are met: 1) the played back code is the track address included in the track location identifier stored in a controlling microcontroller, 2) the amplitudes of the "1 bits" of the played back code are all the same and equal to 1/2 the amplitude of a full track width output. When "on track", the servo transducer straddles the line between adjacent lines of magnetized blocks and non magnetized blocks, and therefore plays back 1/2 amplitude signals from the magnetized blocks on one side of the "on track" line and 1/2 amplitude signal from the magnetized blocks on the other side of the "on track" line.

REFERENCES:
patent: 4048660 (1977-09-01), Dennison et al.
patent: 4409628 (1983-10-01), Frimet et al.
patent: 4472750 (1984-09-01), Klumpp et al.
patent: 4977472 (1990-12-01), Volz et al.
IBM Technical Disclosure Bulletin, vol. 25, No. 2, "Re-Recordable Servo System for Multi-Track Tape", Schwartz, Jul. 1982, pp. 778-779.

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