Signal separator having function of subsampling digital composite video signal

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a signal separator which keeps a conventional signal separation performance and can reduce a memory capacity required for delaying a composite video signal by one frame period.
According to the invention, there is provided a signal separator comprising: A/D converter means for receiving a composite color video signal including first and second signal components and outputting a digital signal; timing signal generating means for receiving the digital signal output from the A/D converter means and generating at least first and second timing signals; data band compression means for compressing a data band of the digital signal output from the A/D converter means in accordance with the first timing signal generated by the timing signal generating means and outputting a compressed signal; delay memory means for delaying the compressed signal output from the data band compression means by one frame and outputting a delayed signal; first interpolation means for interpolating the delayed signal output from the delay memory means by the compressed signal output from the data band compression means in accordance with the second timing signal generated by the timing signal generating means, and outputting a first interpolated signal; first separation means for separating the first signal component from the composite color video signal by mixing the first interpolated signal output from the first interpolation means and the digital signal output from the A/D converter means; second interpolation means for interpolating the first signal component separated by the first separation means by a predetermined signal and outputting a second interpolated signal; and second separation means for separating the second signal component by mixing the first interpolated signal output from the first interpolation means and the second interpolated signal output from the second interpolation means.