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:
Dec. 13, 2005
Filed:
Mar. 15, 2000
Kenji Narumi, Osaka, JP;
Tetsuya Akiyama, Osaka, JP;
Kenichi Nishiuchi, Osaka, JP;
Shigeaki Furukawa, Osaka, JP;
Kenji Narumi, Osaka, JP;
Tetsuya Akiyama, Osaka, JP;
Kenichi Nishiuchi, Osaka, JP;
Shigeaki Furukawa, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A method by which, in an optical disk recording and reproducing device, the time required for a test recording performed prior to an actual information recording can be reduced according to characteristics of an optical disk. A random pattern signal is transmitted from a random pattern signal generating circuitand recorded on a test track on an optical disk, and a bit error rate of a reproduction signal is measured. Only when a value of the bit error rate is not less than a fixed value, test pattern signals are transmitted from a test pattern signal generating circuitand recorded. An edge timing of a reproduction signal is measured by an edge timing detecting circuit. Based on a result of the measurement, edge positions of a front-end pulse and a back-end pulse are corrected.