Color hue control circuit for color television receiver

Details Color hue control circuit for color television receiver Color hue control circuit for color television receiver

1977-04-08

1978-05-23

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

040914119

ABSTRACT:
A color television receiver having a color picture tube with a screen for displaying a color picture in response to the reception of a composite color television signal which includes a phase reference signal, such as, the chrominance reference portion of a VIR signal, is provided with a circuit for generating variable reference color signals and for causing the color picture tube to display, on at least a portion of its screen, areas of respective colors corresponding to the variable reference color signals, a demodulating circuit for demodulating the phase reference signal and the chrominance component of the color television signal for obtaining demodulated color signals from such chrominance component, a hue correction circuit responsive to the demodulated phase reference signal for correcting errors in the hue of the color picture displayed on the screen in correspondence to the demodulated color signals due to phase distortions in the chrominance component of the received color television signal, and a manually actuable hue adjuster for simultaneously and correspondingly varying the relation of the demodulated color signals to each other and the relation of the variable reference color signals to each other so that the hue of the areas of colors displayed on said screen will correspond to the hue of the color picture displayed on the screen. The color television receiver is further provided with a circuit for generating fixed standard color signals having a relation to each other representing a predetermined standard hue, and for causing the color picture tube to display, on a second portion of its screen adjacent the first mentioned portion of the screen, areas of primary colors corresponding to the standard color signals so that the relation of the hue of the displayed color picture to the standard hue can be readily determined by visual comparison of the areas of colors on the first portion of the screen with the respective areas of primary colors on the adjacent second portion of the screen.

REFERENCES:
patent: 2854505 (1958-09-01), Davis
patent: 3679816 (1972-07-01), Avins et al.
patent: 3763310 (1973-10-01), Sagishima et al.
patent: 3780218 (1973-12-01), Rennick

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