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:
Nov. 08, 1983
Filed:
Jan. 13, 1982
Applicant:
Inventors:
Kazuo Tokuda, Tokyo, JP;
Tokio Sawataishi, Tokyo, JP;
Assignee:
Nippon Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358153 ; 328139 ;
Abstract
The present invention provides a transistor circuit suited for a synchronizing signal separator. More particularly, the transistor circuit can separate the noise-free synchronizing signal from a composite video signal. The transistor circuit comprises a transistor having an emitter coupled to an input terminal through a capacitor and to a constant current source, a base applied with a bias voltage and a collector connected to an output terminal, a comparator comparing the emitter voltage with a reference voltage, and means for turning the transistor off in response to the comparator output. A current charging circuit is preferably added.