Apparatus for the demodulation of a carrier chrominance signal into color difference signals

A digital color signal processing device for digital-processing a carrier chrominance signal, comprising:

• (A) sampling clock signal producing means for producing first, second, third and fourth sampling clock signals, which have a frequency equal to that of the color burst signals of the carrier chrominance signal and have phases which differ by 90 degrees from each other, respectively, on the basis of the color burst signal contained in the received carrier chrominance signal;
• (B) sampling means for sampling the received carrier chrominance signal in accordance with the first, second, third and fourth sampling clock signals produced by said sampling clock signal producing means, thereby forming sampling data;
• and
• (C) subtracting means for effecting subtraction of the sampling data formed in accordance with said first sampling clock signal and the sampling data formed in accordance with the second sampling clock signal, thereby outputting a first baseband signal conforming to a first color-difference signal and effecting subtraction of the sampling data formed in accordance with the third sampling clock signal and the sampling data formed in accordance with the fourth sampling clock signal, thereby outputting a second baseband signal conforming to a second color-difference signal.