Color video signal recording and reproducing system

Claim 1

A color video signal recording and reproducing system comprising a magnetic tape recorder having a predetermined maximum recordable frequency limit, first low-pass filter means for filtering a luminance signal from a color video signal, said video signal including frequency components which are higher than said maximum recordable frequency limit, said first low-pass filter means having a cut-off frequency lower than said maximum recordable frequency limit, first band-pass filter means for separating a carrier chroma signal from said color video signal, first frequency converter means for converting the frequency band of said carrier chroma signal into a frequency band which lies between the cut-off frequency of said first low-pass filter means and said maximum recordable frequency limit, means for superimposing the output of said first low-pass filter means and the output of said first frequency converter means, means for recording the output of said superimposing means on a magnetic tape in said magnetic tape recorder, means for taking out the superimposed signal reproduced from said magnetic tape by said magnetic tape recorder, second low-pass filter means for separating a luminance signal from the output signal of said taking-out means, second band-pass filter means for filtering the frequency converted carrier chroma signal from the output signal of said taking-out means, second frequency converter means for restoring the frequency band of the filtered carrier chroma signal to the original frequency band, means comprising a color burst keyer for keying a color burst signal from the output signal of said second frequency converter means, oscillator means for producing a reference subcarrier signal, means for comparing the phase of said color burst signal with the phase of the output signal of said oscillator means and for producing an error signal corresponding to the phase difference between both signals, voltage control oscillator means having a center frequency of oscillation which is controlled responsive to said error signal, multiplier means for separating a horizontal synchronizing signal from the output signal of said taking-out means and multiplying the frequency of said horizontal synchronizing signal to become a frequency near the subcarrier frequency of the converted carrier chroma signal, and third frequency converter means for frequency converting the output signal of said amplifier means responsive to the output of said voltage control oscillator means and for providing an output signal which is supplied to said second frequency converter means, thereby constituting a feedback loop together with said color burst keyer and said phase comparator means.