PURPOSE: To improve the signal-to-noise ratio of video signals, by relatively increasing the signal component against noises contained in demodulated signals of video signals, such as carrier chrominance signals, luminance signals whose frequency is modulated, etc., in color video signals.

CONSTITUTION: Mixed signals reproduced from a magnetic tape 14, on which video signals of SECAM system are recorded, by a magnetic head 13 are divided into two parts after passing through a front amplifier 15 and one part is supplied to a high-pass filter 16 having a cut-off frequency of 1.5MHz and luminance signals, whose frequency is to be modulated, are separated and filtered. The other part is passed through a low-pass filter 17 and low frequency converting carrier chrominance signals are separated. The output of the filter 16 is demodulated at an FM demodulator 18 and returned to luminance signals, and then, inputted into a mixer 19. One part of the outputs of the filter 17 remains intact, and the other part is converted by the converter 21 after it is changed into two signals delayed by two horizontal scanning periods (2H), and a low frequency carrier converting chrominance signal whose carrier frequency shift and center frequency are reduced to 1/2 is obtained as the output of the converter 21. The frequency and shift are doubled at the next double-multiplying circuit and color video signals are obtained after the low frequency carrier chrominance signals are passed through a filter 24 and mixer 19.