the luminance signal y is supplied via a switch 61 to a 5 4 times time base expansion circuit 62 the picture element data of the line sequential color difference signals cn and cw are supplied via the switch 61 to a 5 times time base expansion circuit 63 these circuits 62 and 63 are arranged to produce their outputs at the same timing for the same horizontal scanning line the picture element data of the line sequential color difference signals cn and cw which are produced from the 5 times expansion circuit 63 are separated from each other by a switch 64 to be supplied to vertical interpolation circuits 65 and 66 respectively these circuits 65 and 66 are arranged to generate data for lines having no color difference signals cn and cw through interpolation processes respectively d a converters 67 68 and 69 are arranged to convert the picture element data of the signals cn cw and y into analog signals the signals cn and cw which are thus restored to their original states are supplied to a modulation circuit 70 to be modulated into the original chrominance signal the chrominance signal thus obtained is mixed with the restored luminance signal at a mixing circuit 71 as a result the mixing circuit 71 produces a restored ntsc signal the tv signal recording and reproducing system which is arranged according to.