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:
Sep. 25, 2006
Filed:
Feb. 24, 2004
Shinichi Konishi, Nara, JP;
Takeshi Nakajima, Nara, JP;
Harumitsu Miyashita, Osaka, JP;
Toshihiko Takahashi, Osaka, JP;
Toshiya Akagi, Osaka, JP;
Yuji Hisakado, Osaka, JP;
Yukihiro Yamasaki, Osaka, JP;
Shinichi Konishi, Nara, JP;
Takeshi Nakajima, Nara, JP;
Harumitsu Miyashita, Osaka, JP;
Toshihiko Takahashi, Osaka, JP;
Toshiya Akagi, Osaka, JP;
Yuji Hisakado, Osaka, JP;
Yukihiro Yamasaki, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical disc drive usable with discs to which data is continuously recorded and discs having a sector format can quickly resume playback signal output after passing imperfection causing potential reading errors, and plays disc with few read errors. A detection signal generator detects DC level fluctuation in the playback signal read from the disc and generates a detection signal tracking the DC level fluctuation. A selector selects a detection signal or a null signal without valid polarity based on the detection signal generated by the detection signal generator and input to the selector. A clamping unit performs a clamping process to suppress DC level fluctuation in the playback signal based on the detection signal when the selection unit selects the detection signal, and does not perform the clamping process when the selection unit selects the null signal. A signal processor performs specific signal processes based on clamping unit output.