FIELD: television. SUBSTANCE: circuit processing video signal raises definition in each of three chrominance channels ( P, G and B ) in response to information on definition. Rise of definition is realized in each chrominance channel with use of extracted information on high spatial frequencies included in this channel in the beginning as background till signal in this channel exceeds in sufficient degree reference level by amplitude that is somewhat higher than anticipated level of thermal noise. When amplitude of information on definition contained in channel at the beginning is not enough higher above this reference level thermal noise is suppressed by way of subtraction of extracted high-frequency spatial information from it. Same filters as those used to rise definition in each chrominance channel are employed to extract high-frequency spatial information intended for suppression of thermal noise in each chrominance channel. EFFECT: raised definition of TV signal and suppression of noise in each chrominance channel. 24 cl
