FIELD: image recording and reproduction. SUBSTANCE: circuit for inserting frequency convolution information has even and odd field detector 5 showing if video signal available is in even or odd field, frequency convolution information generator 7 that produces frequency convolution information about state of frequency convolution according to field detector results, adder 2 that functions to add video signal to frequency convolution information, and positioned 6 connected between adder and generator 7 that functions to feed frequency convolution information to adder at any desired moment. Circuit for separating frequency convolution information in video reproducing device has position detector 13 showing point of frequency convolution information insertion in reproduced video signal, and frequency convolution information separator 14 that separates this information included in reproduced video signal according to results obtained in position detector. EFFECT: improved reliability. 10 cl, 5 dwg
