| 摘要 |
An apparatus for separating luminance and color signals from a composite video signal, which is capable of suppressing a cross luminance phenomenon of the luminance signal and a cross color phenomenon of the color signal. The apparatus comprises a first color signal detecting circuit for detecting a first color signal from the composite video signal, the first color signal suppressing a cross luminance phenomenon of the luminance signal from the composite video signal, and a second color signal detecting circuit for detecting a second color signal from the composite video signal, the second color signal suppressing a cross color phenomenon of the color signal from the composite video signal. The first color signal is selected when the color signal of the composite video signal has a large amplitude and no diagonal variation. The second color signal is selected when the color signal of the composite video signal has a small amplitude and the diagonal variation. Therefore, a definition of the picture can be obtained by suppressing the cross color phenomenon of the color signal and the cross luminance phenomenon of the luminance signal.
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