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. 29, 2008
Filed:
Jul. 09, 2003
Yuji Tawaragi, Tokorozawa, JP;
Yuji Tawaragi, Tokorozawa, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A combined signal Spc in which a pre-pit signal is superposed on a wobble signal is generated based on a radial push-pull signal Spp with a noise component having been removed therefrom. Based on the combined signal Spc, a wobble signal Swith the phase θnot having time fluctuation and a pre-pit signal Sare generated with the phases compared to each other, and then a phase adjustment signal Scorresponding to a phase difference θe is generated. The phase differences θe are stored, and an average value θr thereof generated, the phase difference θe is compared to the average value θr, the phase θis shifted according to only by the phase difference θe only when the phase difference θe is within the range of (θr±W), and then a wobble signal Swith the phase θsynchronized to the pre-pit signal Sis generated.