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:
Jul. 07, 2009
Filed:
Apr. 06, 2004
Hideaki Sasahara, Kawasaki, JP;
Nobuyoshi Ukaji, Hachioji, JP;
Ken Ishihara, Atsugi, JP;
Asahi Kasei EMD Corporation, Tokyo, JP;
Abstract
An AGC control section () has a first operation mode for controlling the gain of a variable gain amplifier () to maintain the amplitude of the sync signal measured by a sync signal amplitude measuring circuit () at a constant value, and a second operation mode for preventing the gain from being increased even when the amplitude of the sync signal measured by the video signal processing circuit () is smaller than the predetermined first reference value and reducing the gain of the variable gain amplifier () only when the amplitude of the video signal exceeds a predetermined second reference value. During operation in the first operation mode, when the amplitude of the sync signal is smaller than the predetermined first reference value and the amplitude of the video signal is greater than the predetermined second reference value, the mode is switched to the second operation mode. During operation in the second operation mode, when the amplitude of the sync signal becomes not less than the predetermined first reference value, the mode is switched from the second operation mode to the first operation mode.