US 4,907,073 AGranted

Adaptive device for separating luminance signal and color signal

AssigneeVictor Company of Japan, Ltd.

InventorKenji Sugiyama

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Abstract

A combination of a variable vertical-direction band pass filter and a variable horizontal-direction band pass filter extracts a color signal from a composite color signal. A vertical-direction variation detector detects a difference between levels of the composite color signal at sampling points separated vertically in a picture. A horizontal-direction variation detector detects a difference between levels of the composite color signal at sampling points separated horizontally in a picture. Pass bands of the vertical-direction band pass filter and the horizontal-direction band pass filter are controlled in accordance with output signals from the vertical-direction variation detector and the horizontal-direction variation detector. A luminance signal is derived from the composite color signal and the color signal.

Claims6

Dependent claims

An adaptive device for separating a luminance signal and a color signal, comprising:

(a) a combination of a variable vertical-direction band pass filter and a variable horizontal-direction band pass filter, the filter combination extracting a color signal from a composite color signal;
(b) vertical-direction variation detecting means for detecting a difference between levels of the composite color signal at sampling points separated vertically in a picture;
(c) horizontal-direction variation detecting means for detecting a difference between levels of the composite color signal at sampling points separated horizontally in a picture;
(d) control means for controlling pass bands of the vertical-direction band pass filter and the horizontal-direction band pass filter in accordance with output signals from the vertical-direction variation detecting means and the horizontal-direction variation detecting means;
and
(e) means for deriving a luminance signal from the composite color signal and the color signal.

3 more elements

Dependencies are inferred from the claim text.