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:
Apr. 19, 1983
Filed:
Dec. 15, 1980
Fumio Miyao, Kanagawa, JP;
Kazumi Tsukioka, Nagano, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A keyed AGC circuit for use in a video data transmitting device such as a facsimile system which operates stably in the presence of external noise. A processing circuit is provided for carrying out digital processing determining whether the synchronizing signal level at an output terminal of the AGC circuit is higher or lower than a pre-set reference level. A multi-stage digital attenuator is controlled in response to outputs of the processing circuit to set the attenuation level. Control of the multi-stage digital attenuator can start with either the most significant bit position of the attenuator prior to video data transmission or with a least significant bit position of the attenuator in a synchronization period after video data transmission has been started.