Color tone control device in color television receiver

Details Color tone control device in color television receiver Color tone control device in color television receiver

1975-01-27

1977-05-03

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

040218430

ABSTRACT:
Red, blue and green color difference signals are supplied to the bases of first, second and third transistors amplifying the tri-color signals of red, blue and green, and a luminance signal is introduced to the emitter of each transistor through a parallel circuit of two resistors. One of the resistors in each parallel circuit is connected through a switch. The switches are associatively operated so that the on-off operation of the switch connected to the emitter of the first transistor is opposite to that of the switches connected to the emitters of the second and the third transistor. By operating the switches, the amplification degree of the first transistor is increased and simultaneously the amplification degrees of the second and third transistors are decreased, and therefore an image with red emphasized can be obtained with no change in luminance.

REFERENCES:
patent: 3328517 (1967-06-01), Davidse
patent: 3612754 (1971-10-01), Altmanshofer
patent: 3617621 (1971-11-01), Cochran
patent: 3639685 (1972-02-01), Morio
patent: 3737562 (1953-06-01), Matzek
patent: 3749825 (1973-07-01), Moore
patent: 3764826 (1973-10-01), Okada
patent: 3783186 (1974-01-01), Slavik
patent: 3812524 (1974-05-01), Ivas et al.
patent: 3843958 (1974-10-01), Furrey
patent: 3864723 (1975-02-01), Carpenter

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