LUMINANCE-CHROMINANCE SEPARATING APPARATUS HAVING A SPATIAL FILTERING EFFECT

摘要

A luminance/chrominance separating apparatus is described in which a luminance and a chrominance signal are extracted from a composite color television signal by a comb filter. The filter comprises a first delay circuit and a second delay circuit, connected in series, and each delaying the composite color signal by one horizontal scanning period. First and second delayed signals are thereby obtained. The second delayed signal is added to the non-delayed television signal to produce a first added signal and this is then added to the first delayed signal to produce a second added signal. The first added signal is also subtracted from the first delayed signal to produce a subtracted signal and a low frequency signal component is extracted from the subtracted signal. A variable attenuator attenuates the low frequency signal component and the output of the attenuator is added to the second added signal.