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:
Jan. 15, 1985
Filed:
Jun. 16, 1982
Laurin C Freyberger, Bahlingen, DE;
Bernd Novotny, Gundelfingen, DE;
ITT Industries, Inc., New York, NY (US);
Abstract
The interface circuit contains a single operational amplifier (OR, OG, OB) per chrominance channel, with a resistance network (WR, WG, WB) for white-level adjustment connected between the inverting input and the output of this amplifier. The output resistances of the matrix output amplifiers (MR, MG, MB) must be low, and a low-value resistor (RR, RG, RB) is connected between the output of each output amplifier and the noninverting input of each operational amplifier (OR, OG, OB). Video-signal, brightness-, blanking, and external-signal-control currents (ISR, ISG, ISB; IHR, IHG, IHB; IBR, IBG, IBB; IER, IEG, IEB) are applied to the non-inverting input of the respective operational amplifier. The control currents permit the white-level adjustment and the blanking-voltage adjustment to be made independently of each other and eliminate any interaction between brightness adjustment, blanking, and external-signal gating. Compared with prior art arrangements, a simpler circuit is obtained.