a motion signal detection circuit adapted to a video recording / reproducing apparatus having a frequency unfolding circuit for unfolding a luminance signal of a high frequency component included in the luminance signal of a low frequency component into an original frequency band , comprising a prefilter for eliminating the folding carrier and sidebands thereof included in the video signal unfolded by the frequency unfolding circuit , a comb filter for filtering the output of the prefilter to detect a motion signal , an error compensation circuit for compensating the errors included in the motion signal output from the comb filter .