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:
May. 08, 2007
Filed:
Dec. 25, 2003
Ryusuke Horibe, Hirakata, JP;
Kazutoshi Aida, Hirakata, JP;
Ryusuke Horibe, Hirakata, JP;
Kazutoshi Aida, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A feedback loop structure including an operational amplifier unit () for amplifying a reproduction signal of recorded information and a gain/offset control unit () for controlling an amplitude and an offset of an output of the operational amplifier unit () so that each of the amplitude and the offset becomes a predetermined value is adopted, and accurate information for an asymmetry amount is obtained by a binarization unit () for receiving the output of the operational amplifier unit () and performing binarization while adjusting a slice level by feedback control so that a duty ratio after the binarization substantially becomes a predetermined value. Based on the asymmetry amount information, a judgment level of a Viterbi decoding unit () is changed, thereby reducing a reproduction error rate.