Integrated interface circuit between the RGB matrix and the vide

Details Integrated interface circuit between the RGB matrix and the vide Integrated interface circuit between the RGB matrix and the vide

1982-06-16

1985-01-15

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358168, 358 33, 358 40, H04N 912, H04N 9535

Patent

active

044941374

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.

REFERENCES:
patent: 3701843 (1972-10-01), Hepner
patent: 4167751 (1979-09-01), Wilcox
patent: 4270139 (1981-05-01), Flamm
patent: 4347528 (1982-08-01), Johnson
Vollstandiger Pal-Decoder Mit Der Integrierten Schaltung TDA 3560 Dec. 1979, Valvo-Entwicklungsmitteilungen.

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