do I need a low pass filter for video luminance notch filter

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yesize

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hello,everyone
I am designning a pal encoder now.I had learned that there should be a notch filter for luminance signal to aviod crosstalk with chrominance signal.so I designed a bandstop filter in Matlab.But the attennulation of high frequency does not meet my porpose.Should I design a low pass filter and place it before the notch filter?
Is there another solution?
thanks
 

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