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. 29, 2006
Filed:
Oct. 18, 2002
Yasuhiro Wada, Onojo, JP;
Keisuke Umeda, Fukuoka, JP;
Yasuhiro Wada, Onojo, JP;
Keisuke Umeda, Fukuoka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A bi-phase mark reproduction apparatus which reduces an error rate of demodulated data by half and improves demodulation ability of ATIP and an optical disk drive device are provided. The bi-phase mark reproduction apparatus includes a data conversion unit which takes out a synchronous code portion, a data portion and an error detection code portion from a bi-phase mark input signal by means of a data separating signal and demodulates data of the data portion and the error detection code portion. The data conversion unit includes a pattern retrieval unit which detects a predetermined error pattern contained in the data portion and a conversion table which decodes the error pattern in accordance with a replacement rule based on bi-phase mark modulation.