Color-difference signal modifying apparatus

Details Color-difference signal modifying apparatus Color-difference signal modifying apparatus

1977-09-26

1979-09-11

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

041677501

ABSTRACT:
A color-difference signal modifying apparatus for modifying a color-difference signal in a color television receiver. The apparatus gives to a color-difference signal a non-linear characteristic which approximates a theoretical characteristic for completely eliminating both luminance and chromaticity errors of a reproduced color. The apparatus is constituted by a threshold signal producing means which is supplied with a luminance signal to produce a threshold signal proportional to the luminance signal, and a gain reduction means which is supplied with the color-difference signal to decrease the gain to remove a specific portion of the color-difference signal which exceeds the threshold signal level.

REFERENCES:
patent: 3107275 (1963-10-01), Chatten
patent: 3705259 (1972-12-01), Lovely et al.
patent: 3919712 (1975-11-01), Izumisawa et al.

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