Color selection circuit for color television

Details Color selection circuit for color television Color selection circuit for color television

1979-06-25

1981-02-03

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

042492009

ABSTRACT:
A color selection circuit for color television, for example for chroma-keying signal generation. The signal generation is done independent of the luminance and depends only on the color with which a given combination of input signals corresponds. This is effected by the use of an equal-signal detection behind amplifier circuits to which input signals, having a predetermined peak-peak value are applied and at least two of these input signals have been set with a given attenuation factor with respect to a third, which setting determines the color at which the keying or switching signal is generated.

REFERENCES:
patent: 3560638 (1971-02-01), Skrydstrup
patent: 3678182 (1972-07-01), Boxman
patent: 3959813 (1976-05-01), Legler
patent: 4051520 (1977-09-01), Davidse
patent: 4183045 (1980-01-01), Herrmann
A Mixer-Keyer Amplifier for Color Television, Naitoh, et al., Jul. 1971, Journal of SMPTE, vol. 80, No. 7, pt. 1, pp. 545-551. _
A Chroma-Key System Insensitive to Variations of Background Ill. Daidse, SMPTE Journal, Mar. 1977, vol. 86, p. 140-143. _

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