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. 16, 2006
Filed:
Mar. 26, 2003
Takaaki Akiyama, Tokyo, JP;
Takaaki Akiyama, Tokyo, JP;
Oki Electric Co., Ltd., Tokyo, JP;
Abstract
A vertical synchronous signal detection circuit includes an analog-digital converter, an average calculation circuit and a compare circuit. The analog-digital converter receives a composite video signal and converts the video signal into a digital signal having a vertical synchronizing pulse. The average calculation circuit is coupled to receive the digital signal. The average calculation circuit calculates an average level of the vertical synchronizing pulse within a predetermined period. The compare circuit is connected to the average calculation circuit. The compare circuit compares a threshold level received thereto with the average level and outputs a synchronous detect signal when the average level falls below the threshold level.