Dynamic enabling network for a color correction circuit

Details Dynamic enabling network for a color correction circuit Dynamic enabling network for a color correction circuit

1980-07-28

1981-10-20

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

042964326

ABSTRACT:
A dynamic enabling network is described for turning off and on a color correction network in a color television receiver. The enabling network receives and combines selected color-difference signals which are superimposed on a D.C. bias level so as to generate a first control signal whose amplitude is near a maximum when the color-difference signals are representative of fleshtone hues. A second control signal, also derived from the selected color-difference signals, is a D.C. signal whose amplitude is a function of the D.C. bias level associated with the selected color-difference signals. Both control signals are applied to a comparator for turning on the color correction circuit only when the difference in amplitude between the two control signals is indicative of hues within a selected range of fleshtones.

REFERENCES:
patent: 3882534 (1975-05-01), Srivastava
patent: 4084178 (1978-04-01), Srivastava et al.

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