Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-01-16
1999-09-07
Edun, Muhammad
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7706, 360 7814, G11B 5596
Patent
active
059496029
ABSTRACT:
A data for measuring deviation between a recording head and a playback head easily for correctly reproducing data despite such deviation. A playback signal amplitude detection circuit 23 detects the amplitude of playback signals of test data from a playback amplifier 15, while adders 51, 52 cumulatively sum the amplitude values of playback signals in a pre-set group of sectors and those in another pre-set sector of groups on a magnetic disc 21 supplied from the playback signal amplitude detection circuit 23. A subtractor 50 computes a difference between a first sum value from the adder 51 and a second sum value from the adder 52 and routes the difference to a controller 11. The controller detects deviation between the recording head and the playback head from the difference value. When recording or reproducing actual data, the controller 11 causes the position of the recording head or the playback head to be corrected on the basis of the detected deviation.
REFERENCES:
patent: 5617388 (1997-04-01), Ishioka et al.
patent: 5703846 (1997-12-01), Saito et al.
Ishioka Hideaki
Onuki Yoshikazu
Seko Satoru
Takeda Toru
Edun Muhammad
Sony Corporation
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