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:
Feb. 06, 2007
Filed:
Sep. 03, 2004
Kuniaki Arai, Kanagawa, JP;
Kuniaki Arai, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A wobbling signal demodulation method is disclosed that is capable of fast and precisely demodulating a wobbling signal without increasing cost of the circuit. The wobbling signal is obtained based on light reflected from a recording surface of an optical disk having a wobbling track formed thereon, and includes a carrier portion having a predetermined basic period and a phase demodulated wave portion including predetermined information. The wobbling signal demodulation method includes a first step of respectively integrating a portion of the wobbling signal corresponding to a first half of the basic period and a portion of the wobbling signal corresponding to a second half of the basic period in synchronization with a clock signal generated from the carrier portion; a second step of generating a digital signal based on a first integration result corresponding to the first half of the basic period and a second integration result corresponding to the second half of the basic period; and a third step of performing a phase demodulation on the phase demodulated wave portion of the wobbling signal based on the digital signal and the clock signal.