Signal recording and/or reproducing apparatus, method, and mediu

Details Signal recording and/or reproducing apparatus, method, and mediu Signal recording and/or reproducing apparatus, method, and mediu

1998-01-14

2000-10-10

Faber, Alan T.

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

061307998

ABSTRACT:
A method and apparatus for recording and/or reproducing signal on or from a recording medium, wherein correct tracking servo signals 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.o.

REFERENCES:
patent: 4843493 (1989-06-01), Furuhata et al.
patent: 4860130 (1989-08-01), Yokosawa et al.
patent: 5191491 (1993-03-01), Zweighaft
patent: 5325246 (1994-06-01), Guisinger
patent: 5959802 (1999-09-01), Sato

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