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:
Aug. 31, 1999
Filed:
Apr. 23, 1997
Isao Okada, Chofu, JP;
Tsuyoshi Hirabuki, Chofu, JP;
Mitsumi Electric Co., Ltd., Tokyo, JP;
Abstract
A speed error detecting portion detects a speed error which is a frequency difference between a reproduced clock signal which is reproduced from a recording medium and a reference clock signal. A first phase error detecting portion detects a phase error which is a phase difference between the reproduced clock signal and the reference clock signal. A servo signal generating portion generates a servo signal which is used for eliminating the speed error and phase error. A second phase error detecting portion detects a phase error which is a phase difference between a reproduced synchronization signal reproduced from the recording medium separately from the reproduced clock signal and a reference synchronization signal. A reference phase changing portion changes the phase of the reference clock signal based on the phase error detected by the second phase error detecting portion. A reference frequency changing portion changes the frequency of the reference clock signal based on the phase error detected by the second phase error detecting portion.