Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1995-07-11
1999-09-28
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7713, 360 31, 386 79, G11B 5584
Patent
active
059598026
ABSTRACT:
A method and apparatus for recording and/or reproducing signal on or from a recording medium includes correct tracking servo signals which may be produced so that tracking errors may be detected correctly. The pilot signal from a recording amplifier 3, produced by frequency-dividing system clocks by a frequency divider 2, is recorded on the recording medium by a servo head 21 at the timing of a timing signal GP.sub.1. A tracking servo signal, obtained by reproducing the pilot signal by a recording/reproducing head 22, delaying the resulting signal by a delay circuit 4 and phase-shifting the resulting delayed signal by a phase shifting unit 5, is recorded at the timing of a timing signal GP.sub.2. The pilot signal and the tracking servo signal are reproduced by the recording/reproducing head 22 and the pilot signal is delayed by the delay circuit 4. An XOR circuit 11 takes an XOR between the reproduced tracking servo signal and the delayed pilot signal and the resulting signal of the XOR circuit is sampled and held by a sampling hold circuit 13 for detecting a servo error signal D.sub.0.
REFERENCES:
patent: 4843493 (1989-06-01), Furuhata
patent: 4860130 (1989-08-01), Yokosawa
patent: 5191491 (1993-03-01), Zweighaft
patent: 5325246 (1994-06-01), Guisinger
Faber Alan
Maioli Jay H.
Sony Corporation
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