Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1975-09-24
1977-05-10
Richardson, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 50, H04N 952, H04N 909
Patent
active
040232000
ABSTRACT:
The red, green and blue color signals are, respectively, applied to the base of three transistors, each connected as a common emitter stage. A constant current source has an output terminal connected to that side of the emitter resistors not connected to the respective emitter. The conductivity of the emitter resistors is proportional to the coefficients in the equation Y=k1.sup.. R+k2.sup.. G+k3.sup.. B where Y is the luminance signal. For the PAL system, the color difference signals are then derived from the collector of the emitter follower stage receiving the red and green signals and the luminance signal is derived at the constant current output terminal. For the NTSC system, the same signals are derived from the same terminals, but an additional coupling resistor is added between the emitter of the transistor receiving the blue signal and the other two emitters.
REFERENCES:
patent: 3429987 (1969-02-01), Altmann
patent: 3597639 (1971-08-01), Harwood
patent: 3639685 (1972-02-01), Morio
patent: 3663745 (1972-05-01), O'Toole
patent: 3715470 (1973-02-01), Craig
Psitos Aristotelis M.
Richardson Robert L.
Robert Bosch G.m.b.H.
Striker Michael J.
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