Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1996-06-24
1999-07-13
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
386 79, G11B 5584
Patent
active
059234938
ABSTRACT:
An information signal reproducing apparatus for reproducing an information signal from a recording medium on which at least one kind of pilot signal component having a predetermined frequency is multiplexed with the information signal on every other track over a multiplicity of parallel tracks. The apparatus is arranged to form a tracking error signal in accordance with the pilot signal component contained in a signal reproduced during a first period by a head for reproducing a signal by periodically tracing the recording medium at a predetermined period, the first period having a length corresponding to that of the predetermined period, and execute a modifying operation for modifying the tracking error signal by using a signal reproduced by the head during a second period immediately before the first period, the second period having a length corresponding to that of the predetermined period. As another arrangement for producing an appropriate tracking control signal while executing the modifying operation, the apparatus includes a forming circuit for forming a tracking error signal in accordance with the pilot signal component contained in the signal reproduced during the predetermined period in which the head mainly reproduces a track on which the pilot signal component is multiplexed, and the forming circuit includes a sampling circuit for sampling the tracking error signal immediately after a start of the predetermined period and immediately before an end of the predetermined period.
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Canon Kabushiki Kaisha
Habermehl James L
Sniezek Andrew L.
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