Television color correction circuit

Details Television color correction circuit Television color correction circuit

1980-06-26

1981-12-22

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 80, H04N 9535, H04N 146

Patent

active

043074120

ABSTRACT:
A television color correction circuit which is particularly advantageous for converting, for example, a film, a slide or a photograph into color television signals, each signal channel (2) including a pulse adder (5) and pulse separating circuit (11), respectively, coupled to an input (1) and output (3), respectively, for processing a pulse having a predetermined amplitude and occurring in line blanking periods. The outputs of the pulse separating circuits (11) are connected to a pulse adder and comparator circuit (19) for performing a pulse addition with predetermined factors and for comparing the pulse amplitude of the summed pulse with a reference value Uref, the d.c. voltage-carrying output (20) of this circuit (19) being connected to a control input (30) of a controllable amplifier circuit (7G') included in one (2G) of the signal channels (2), the other signal channels (2R, 2B) having been provided with adjustable amplifier circuits (7R, 7B). A color correction may be performed over a wide range, a constant luminance value being present independent of the change in the gain factors.

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