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:
Mar. 30, 2010
Filed:
Jul. 01, 2005
Yasumasa Hayakawa, Gunma, JP;
Yasumasa Hayakawa, Gunma, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A signal processing apparatus for an optical disk system which apparatus has a variable gain amplifier that amplifies with a variable gain a light-detected signal obtained from an optical disk on which to perform playback processing so as to make a level of the light-detected signal coincide with a first reference level. The apparatus comprises a comparator that compares the level of the light-detected signal amplified by the variable gain amplifier with the first reference level; a gain adjuster that generates and supplies a control signal to adjust the variable gain according to a result of the comparing to the variable gain amplifier; and a gain adjustment controller that, when the level of the light-detected signal amplified is within a level range including the first reference level, controls a level of the control signal of the gain adjuster to be held at its preceding value.