| 摘要 |
PURPOSE:To elimate an interference component due to crosstalk, etc. at reproduction and to make the elimination of interference easy, by recording a carrier frequency of an FM modulation wave applied to the 1st and 2nd magnetic heads with a value different from a frequency odd number times of 1/4 of a horizontal scanning frequency. CONSTITUTION:A video signal from a video input terminal 1 is formed into a prescribed amplitude at an AGC circuit 2 and a luminance signal component is applied with FM modulation at an FM modulator 3. After the chroma signal component is converted for low frequency and phase-shifted at a chroma signal recording circuit 19, the result is mixed with the FM modulation wave at a mixer 4, applied to the 1st and the 2nd video heads 7, 8 via a switching circuit 6 and recorded on a magnetic tape with the heads 7, 8. The switching circuit 6 is operated with a switching pulse of a square wave outputted at an FF 11 detected with a drum rotating phase detecting head 9. This pulse is applied to the modulator 3, the frequency of the FM modulation wave applied to the heads 7, 8 is stored in a different value, allowing to make the elimination of the interference due to the crosstalk of a reproducing circuit easy. |
