| 摘要 |
PURPOSE:To make dot disturbance reduceable, by properly using a luminance signal/ chrominance component separation filter depending upon the correlation between picture in the vertical and horizontal directions of composite color TV signals. CONSTITUTION:Delaying means 5a and 5b which can simultaneously obtain a notable sampling point, at which luminance signals and chrominance components are to be separated from each other, and sampling points close to the sampling point by delaying an inputted sampling signal and a picture correlation deciding means 7 which respectively detects the picture correlation in both vertical and horizontal directions from the values of the notable and close sampling points and decides the correlation of pictures, are provided. In accordance with the detected results of a vertical correlation detecting means 13a and horizontal correlation detecting means 13b, the deciding circuit 14 of the means 7 corrects the decided results of presence/absence of correlation in horizontal and vertical directions and sends a signal which selects the output of a horizontal- direction chrominance component extracting filter 6b, vertical-direction chrominance component extracting filter 6a, or horizontal-vertical-direction chrominance component extracting filter 6c. Therefore, dot disturbance can be reduced.
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