Color video signal recording and/or reproducing system

A color video signal recording and reproducing system comprising:

• first separation means for separating a luminance signal from an input color video signal;
• means for frequency modulating the separated luminance signal and producing a frequency-modulated luminance signal;
• second separation means for separating a carrier chrominance signal from said input color video signal;
• signal processing means operating in a recording mode to frequency convert the separated carrier chrominance signal into a band which is lower than the band of said frequency-modulated luminance signal and for advancing the phase of said carrier chrominance signal by 90.degree. for every successive horizontal scanning period within a sepcific period and for delaying the phase by 90.degree. for every successive horizontal scanning period within a succeeding specific period;
• means for multiplexing said frequency-modulated luminance signal and said signal processed carrier chrominance signal, and means for recording the resulting multiplexed signal on a plurality of successive tracks which are parallel and side-by-side on a recording medium, said recording means advancing the phase of the carrier chrominance signal by 90.degree. and delaying the phase of the carrier chrominance signal by 90.degree., to be aligned on mutually adjacent tracks;
• means for reproducing said signal recorded on said recording medium;
• third separation means for separating said frequency-modulated luminance signal from the reproduced signal;
• means for demodulating said separated frequency-modulaed luminance signal;
• fourth separation means for separating the signal processed carrier chrominance signal from said reproduced signal;
• said signal processing means operating in a reproducing mode to frequency convert the carrier chrominance signal separated by said fourth separation means to restore the same to the original frequency band and for phase shifting by 90.degree. during every horizontal scanning period to restore the same to the original carrier chrominance signal which has the original phase;
• means for delaying by one horizontal scanning period the output signal of said second signal processing means;
• means for mixing the output signal of said second signal processing means and the output signal of said delaying means;
• and
• means for mixing the demodulated luminance signal and the output carrier chrominance signal of said mixing means and for deriving the resulting signal as a reproduced color video signal.

A system for recording a composite color television signal on a plurality of tracks along a record medium, said signal including chrominance signal components representative of image information during recurring line and field intervals, said system comprising:

• means for generating first and second reference signals, said first reference signal progressing in phase at a rate corresponding to said line interval, and said second reference signal regressing in phase at a rate corresponding to said line interval;
• means for combining said chrominance signal components during traversal of adjacent ones of said tracks alternately with said first and second reference signals;
• and
• means for recording said combined signal on said record medium.

A signal reproducing system comprising:

• means for recovering a line rate chrominance signal from a record medium, on which it was recorded in a plurality of closely adjacent tracks, by traversal of said tracks by a signal pickup device;
• means for generating first and second reference signals which respectively progress and regress in phase at said line rate;
• means for combining said chrominance signals obtained during traversal of alternate ones of said tracks with respective ones of said first and second ones of said reference signals;
• and
• filtering means responsive to said combined signals for rejecting frequency components of said combined signals occurring at integral multiples of said line rate and passing frequency components of said combined signals occurring at odd half-multiples of said associated line rate, for passing desired chrominance signal components and rejecting chrominance crosstalk components from adjacent ones of said tracks.

A color video signal recording system comprising:

• first separation means for separating a luminance signal from an input color video signal;
• modulation means for frequency modulating the separated luminance signal to produce a frequency-modulated luminance signal;
• second separation means for separating a carrier chrominance signal from the input color video signal;
• first conversion means for frequency converting the separated carrier chrominance signal to a band which is lower than the band of the frequency-modulated luminance signal;
• first shifting means for phase shifting the frequency converted carrier chrominance signal by 0.degree. , 90.degree. , 180.degree. and 270.degree., respectively;
• first switching means for selectively passing one of the four signals which are phase shifted by said first shifting means;
• first control means for controlling said first switching means in such a manner that the phase of the output signal of said first switching means advances by 90.degree. every successive horizontal scanning period during a specific period and alternately therewith delays by 90.degree. every successive horizontal scanning period during a successive specific period;
• first mixing means for multiplexing the frequency modulated luminance signal and the output signal of said first switching means;
• and
• recording means for recording the resulting multiplexed signal on a successive plurality of side-by-side tracks, with a carrier chrominance signal of a phase which is advanced successively by 90.degree. being recorded opposite a carrier chrominance signal of a phase which is delayed successively by 90.degree..