Tracking control which avoids lock-up for rotary head reproducin

Details Tracking control which avoids lock-up for rotary head reproducin Tracking control which avoids lock-up for rotary head reproducin

1993-10-06

1995-05-02

Wamsley, Patrick

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7713, 360 64, 360 7307, G11B 558, G11B 5584, G11B 1514, G11B 1546

Patent

active

054125200

ABSTRACT:
In rotary head reproducing apparatus of the type having heads which scan successive tracks on a record medium that is movable at a controllable speed, wherein such tracks contain a pattern of tracking control signals that are used by a servo control arrangement to determine and correct tracking errors, at least one of the tracking control signals that are reproduced from the tracks is detected, and if that tracking control signal is not sensed for a predetermined time interval, the speed at which the record medium is driven is changed to a predetermined speed (e.g. greater or less than the normal speed), thereby forcing tracking errors. This prevents lock-up which could occur when the tracks which are scanned by the heads are precisely out-of-phase from the correct tracks.

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patent: 5233488 (1993-08-01), Yanagihara

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