Luminance/chrominance separating apparatus having a spatial filtering effect

Claim 1

A luminance/chrominance separating apparatus for a composite color television signal including a luminance signal and carrier chrominance signal, said carrier chrominance signal being formed by modulating a subcarrier wave with chrominance information, the subcarrier frequency of said subcarrier wave being m/2 (m being an odd number) of the horizontal scanning frequency of said composite color television signal, said separating apparatus comprising: first and second series connected delay means for respectively providing a delay for said composite color television signal, the delay time of each of said first and second delay means being equal to one horizontal scanning period of said composite color television signal, said first and second delay means producing first and second delayed signals, respectively; means for applying said composite color television signal to an input of said first delay means as a non-delayed signal; first adding means for adding said non-delayed signal to said second delayed signal to produce a first added signal; second adding means for adding said first delayed signal to said first added signal to produce a second added signal; means for subtracting said first added signal from said first delayed signal to produce a subtracted signal; means for extracting a low frequency signal component from said subtracted signal; variable attenuator means for attenuating said low-frequency signal component; and third adding means for adding an output signal of said variable attenuator to said second added signal.