PURPOSE: To reduce the required memory capacity and power consumption for a time expansion circuit.

CONSTITUTION: A time expansion circuit 18 is provided to an input stage, that is, a post stage of a de-emphasis circuit 16. In this case, since a data rate of the time expansion circuit 18 is selected to be 16.2MHz, the operating frequency is reduced to 1/3 in comparison with a conventional demodulator, where a time expansion circuit is arranged to a post-stage of a matrix circuit 34. Furthermore, it is not required to apply time expansion to each of R, G, B signals but it is enough to apply time expansion to a luminance signal and color difference signals.