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US 4,285,005 AGranted
Color correction circuit for a color television receiver
AssigneeZenith Radio Corporation
InventorGopal K. Srivastava
Life of this patent
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AssigneeZenith Radio Corporation
InventorGopal K. Srivastava
Estimating the term…
A color correction circuit is described for use in a color television receiver of the type which includes a B-Y demodulator and a network for sensing color-difference signals which are representative of hues within a selected range of fleshtones. In the preferred embodiment, the color correction circuit includes a voltage follower which is activated by the sensing network and which is coupled to opposite polarity outputs of the B-Y demodulator. When the network senses the presence of color-difference signals within the fleshtone range, the voltage follower is activated to combine a portion of one B-Y color-difference signal with the opposite polarity color-difference signal so as to develop a resultant B-Y signal of a reduced amplitude. At the same time, an offset current is automatically added to the resultant B-Y signal for off-setting the hues associated with the latter signal toward the fleshtone axis.
In a color television receiver having at least a B-Y demodulator for developing a pair of color-difference output signals of opposite polarity, and having a network for sensing color-difference signals representative of hues within a range of fleshtones, a color correction circuit comprising:
In a color television receiver having at least a B-Y demodulator for developing a pair of color-difference outputs of opposite polarity, having at least one current mirror receiving one of the demodulator's outputs for mirroring a color-difference current of a first polarity to an output terminal, having at least a second current mirror receiving the other one of the demodulator's outputs for mirroring a color-difference current of a second polarity to the output terminal, and having an enabling network for sensing color-difference signals representative of hues within a range of fleshtones, a color correction circuit, comprising:
Dependencies are inferred from the claim text.