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. 16, 2011
Filed:
Jun. 27, 2008
Dai Ichiryu, Osaka, JP;
Mitsuru Sakai, Osaka, JP;
Dai Ichiryu, Osaka, JP;
Mitsuru Sakai, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
There is provided an optical disc recording/reproducing apparatus which can reduce the chip size using the high-miniaturization process and can enhance the detection accuracy. A signal which is obtained by amplitude-adjusting a header region in a reproduced signal detected by an optical pickup () is digitized, and peak detection or bottom detection from the reproduced signal in each of a first section and a second section in the header region is performed by detection circuits () to (), respectively. Then, amplitude data in the first section and the second section are obtained by subtracters () and () from the detected values in the respective detection circuits. A difference in amplitude between the first section and the second section in the header region is obtained by a subtracter () based on the amplitude data, and the amplitude difference is outputted as an off-track error signal. The respective detection circuits () to () perform detection operations in the first and second sections, and hold the detection operations in the sections other than the first and second sections.