| 摘要 |
A filtering circuit separates from the composite color television signal both the luminance and chrominance signals that includes a delay circuit for delaying the composite color video signal. A first filter is also provided which is responsive to the video signal and the delayed video signal and extracts a chrominance signal corresponding to a frequency component of a color subcarrier in a vertical direction. A second filter is used which is responsive to at least the delayed video signal and extracts a chrominance signal corresponding to a frequency component of the color subcarrier in a horizontal direction. Lastly, a third filter is utilized which is responsive to the video signal and the delayed video signal and extracts a chrominance signal corresponding to a frequency component of the color subcarrier in both the vertical and horizontal direction. This filter circuit then determines, in response to the video signal and the delayed video signal, a correlation in a televised picture in the vertical and horizontal directions, respectively. In accordance with this determination, a switching circuit selects one of the chrominance signals extracted, respectively, by the first to third filters as an output.
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