Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1984-03-19
1986-01-07
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 556
Patent
active
045637148
ABSTRACT:
In a method and device for controlling the tracking in a playback mode in accordance with at least four pilot signals of different frequencies f1, f2, f3 and f4 which are sequentially recorded together with information signals on tracks of a recording medium in a predetermined cyclic sequence and which satisfy a relationship .vertline.f1-f2.vertline.:.vertline.f2-f3.vertline.:.vertline.f3-f4.vertli ne.=A:B:A, an extraction section extracts pilot signal components from reproduced signals obtained by playing back the recording medium. A reference signal supplying section supplies four reference signals which have the same relationship those of the four pilot signal frequencies f1, f2, f3 and f4 and a different cyclic sequence from that of the four pilot signals. A comparing and detecting section compares the extracted pilot signal components with the corresponding reference signals and detects differences between the two pilot signal components extracted from the right and left tracks adjacent to the reproduced track and the corresponding reference signals so as to obtain two difference frequency signal components which respectively have predetermined constant frequencies in any track. A detecting and generating section detects a level difference between the two difference frequency signal components and generates a tracking control signal having a polarity and level which correspond to a tracking error.
REFERENCES:
patent: 4297733 (1981-10-01), Sanderson
Stellar George G.
Tokyo Shibaura Denki Kabushiki Kaisha
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