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:
Apr. 30, 2002
Filed:
Dec. 17, 1998
Takamichi Yamakoshi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
In a phase synchronizing apparatus and a phase synchronizing method, a plurality of sine-wave signals synchronizing with the rotation of a discoid recording medium and having phases different from each other are generated, amplitudes of the plurality of sine waveforms are successively corrected in accordance with the output of phase comparator, and thereafter the correction results are supplied to a closed loop composed of phase comparison means and clock signal generator. Thereby, even if a phase fluctuation occurs in a time reference signal due to the eccentricity of a discoid recording medium, it is possible to correct a phase error generated in the output of the phase comparator correspondingly to the phase fluctuation and thus, realize a phase synchronizing apparatus and a phase synchronizing method capable of outputting a clock signal accurately following the eccentricity of a discoid recording medium.