The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1999
Filed:
Jul. 11, 1995
Tsuguo Sato, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
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.