Color temperature control circuit

Details Color temperature control circuit Color temperature control circuit

H - Electricity

04

N

350/61

H04N 9/12 (2006.01) H04N 9/73 (2006.01)

Patent

CA 1162298

-17- ABSTRACT OF THE DISCLOSURE A color temperature control circuit for use in a color television receiver includes a first differential amplifier which compares a luminance signal with a reference voltage and when the luminance signal drops below the reference voltage, it is so actuated as to derive a current from a green chrominance signal to reduce the green chromi- nance signal level, and the second differential amplifier which compares the luminance signal with the reference voltage and when the luminance signal drops below the reference voltage, it is so actuated as to derive a current from a red chrominance signal to reduce the red chrominance signal level. When the first and the second differential amplifiers are actuated, signal level of a blue chrominance signal is apparently increased to turn a white image to a bluish white image.

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