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:
Dec. 20, 1988
Filed:
Sep. 17, 1986
Sadayuki Narusawa, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
A vertical synchronizing signal detection circuit detects a vertical synchronizing signal from a television signal by detecting level of the television signal by sampling the television signal at a plurality of sample points established in a plurality of successive horizontal scanning periods and comparing a pattern of level of the television signal during the successive horizontal scanning periods with a reference pattern on the condition that synchronizing signals each discriminating a horizontal scanning period are accurately detected during these horizontal scanning periods. An erroneous detection of a false vertical synchronizing signal caused by noise or dropout can be prevented.