Head positioning in a multi-track magnetic tape recorder/player

Details Head positioning in a multi-track magnetic tape recorder/player Head positioning in a multi-track magnetic tape recorder/player

1994-07-06

1998-03-10

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7701, G11B 5584

Patent

active

057268240

ABSTRACT:
A method of positioning the read/write head onto a desired data track in a multi-track recorder/player utilizes a plurality of registration stripes to find the central axis of a data track. In one embodiment, each registration stripe has associated with it a recorded identification pattern or tone which may be sensed and used for identification purposes. Then, based upon the read amplitude output of the read head, the appropriate edge of a registration stripe may be detected and, from there, the read/write head moved directly onto the desired data track without any subsequent open-loop movement. In an alternative embodiment, multiple edges are sensed and used in a calculation to determine the lateral displacement associated with the longitudinal centerline of a desired data track. Preferably, a threshold value is chosen which allows the read head to sense a slight overlap between the read head and the magnetization associated with the registration stripe and the lateral displacement associated therewith, this being used in a mathematical calculation to determine an exact lateral positioning.

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