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US 4,090,216 AGranted
Ambient light contrast and color control circuit
AssigneeGTE Sylvania Incorporated
InventorDouglas W. Constable
Life of this patent
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Abstract
Contrast and color levels in a color television receiver are automatically varied with ambient light variations by an RC circuit AC coupling an ambient light responsive device to a luminance signal channel and DC coupling the ambient light responsive device to a DC potential source and a chrominance signal channel.
Claims10
In a color television receiver having luminance and chrominance signal channels and a DC potential source, an ambient light contrast and color control circuit comprising:
- an ambient light responsive device;
- and
- circuit means for AC coupling said ambient light responsive device in said luminance signal channel to effect signal contrast variations and DC coupling said ambient light responsive device to said DC potential source and to said chrominance signal channel to effect color signal variations in accordance with variations of said ambient light responsive device.
An ambient light contrast and color control circuit for a color television receiver comprising:
- a chrominance signal channel having a DC potential source and a given chroma signal level;
- a luminance signal channel having a given luminance signal level;
- an ambient light responsive device;
- and
- an RC circuit means DC coupling said ambient light responsive device to said DC potential source and in said chrominance signal channel to alter said given chroma signal level in accordance with alterations in said ambient light responsive device and AC coupling said ambient light responsive device in said luminance signal channel to effect alterations of said given luminance signal level in accordance with alterations in said ambient light responsive device.
2 more elements
Dependencies are inferred from the claim text.