| 摘要 |
PURPOSE:To decrease the occurrence of cross modulation component between multiple signals by multiplexing plural different kinds of signals including frequency-modulated signals in terms of frequency and impressing a high frequency bias so as to supply a recording signal to a magnetic recording head. CONSTITUTION:A color video signal is separated to a luminance signal and a carriage chrominance signal by a low pass filter 5 and a band-pass filter 8 and FM-modulated luminance signal and the carriage chrominance signal converted in terms of low pass are inputted in a synthesizing unit 11 with respectively occupying separate bands. Then both signals are multiplexed in terms of frequency and amplified in a recording amplifier 12 to be inputted in a synthesizing unit 13. Meanwhile, a signal which gives a high frequency bias magnetic field generates the frequency equal to several fold frequency of the maximum frequency of the recording signal in a bias oscillator 15, which is amplified in an amplifier 14 and inputted in the synthesizing unit 13. The frequency multiplexed signal superposed on the high frequency bias is given to a rotary head 16 and recorded in a video track on a magnetic tape 17. Thus, cross modulation more between both signals can be remarkably decreased since the input/ output relation of an electromagnetic conversion system becomes nearly linear.
|
