a main emphasis circuit the chrominance signal is supplied to a frequency converter 19 via an automatic chroma control circuit acc 18 thereby the chrominance signal is frequency converted and supplied to the adder 17 then the frequency modulated luminance signal and the frequency converted signal are added by the adder 17 thereafter these signals are supplied to a video head via a recording amplifier 20 and recorded on a tape reference numeral 21 is a conversion signal generator for generating a signal which is used when a frequency conversion is performed by the above frequency converter 19 an operation of the above arranged circuit will be explained by the use of frequency characteristics of fig2 a to 2d first of all the luminance signal is separated from the video input signal by the low pass filter 11 fig2 a shows an output characteristic of the low pass filter 11 as shown in this figure the luminance signal component which is a signal component low frequency component whose cutoff frequency is f 0 or less has a constant gain g which is sufficiently high however the gain of a noise signal component high frequency component having frequency of f 0 or more is controlled low the luminance signal component separated by.