Video tape recorder device utilizing single magnetic head

Claim 2

A recording device for a video tape recorder comprising: first means for receiving an original color television signal containing an original luminance signal component representing the contrast of picture elements and an original chrominance signal component which is obtained by modulating a first subcarrier wave with color signals; second means coupled to said first means for filtering out the original chrominance signal component from the original color television signal; third means for providing a reference subcarrier wave having a frequency equal to and synchronized with that of the first subcarrier wave; fourth means for providing a quasi-subcarrier wave whose frequency is n /m times that of the first subcarrier wave, where n and m are odd integers and n is smaller than m; fifth means coupled to both said third and fourth means for forming a signal whose frequency corresponds to a sum of the frequencies of the reference subcarrier wave and of the quasisubcarrier wave; sixth means coupled to both said second and fifth means for frequency-shifting the original chrominance signal component located about the first subcarrier wave into a new chrominance signal component located about the quasi-subcarrier wave; seventh means coupled to said first means for filtering out only a new luminance signal component distributed in a slightly higher frequency region than that of the quasi-subcarrier wave from the original luminance signal component included in the original color television signal; eight means coupled to both said sixth and seventh means for mixing the filtered new luminance signal component with the frequency-shifted new chrominance signal component, thereby forming a new color television signal whose bandwidth is more reduced than that of the original color television signal; ninth means coupled to said eighth means for frequency modulating a carrier wave with said new color television signal to produce a modulated wave; tenth means for providing a pilot signal related To said first subcarrier wave; eleventh means for superposing said modulated signal on said pilot signal to produce a superposed signal; and twelfth means for recording said superposed signal on a magnetic medium by means of a common magnetic head.

Claim 3

Apparatus according to claim 1 wherein said original color television signal includes a color burst signal and wherein said third means comprises detecting means coupled to said means for receiving said original color television signal, for detecting said color burst signal.

Claim 4

Apparatus according to claim 1 wherein said original color television signal includes a horizontal synchronizing signal and a color burst signal, and wherein said third means comprises: a synchronous detector for extracting the horizontal synchronizing signal from the original color television signal; a burst gate for extracting the burst signal from the original color television signal by gating the original color television signal in synchronism with the detection of the horizontal synchronizing signal in said synchronous detector; and a phase synchronizing oscillator for generating the reference subcarrier wave having the same frequency as the burst signal from said burst gate and synchronized therewith in phase.

Claim 5

Apparatus according to claim 1 wherein said fourth means comprises: a frequency divider for dividing the frequency of the reference subcarrier wave by m; and a frequency multiplier for multiplying the frequency of the frequency-divided signal from said frequency divider by n.

Claim 6

Apparatus according to claim 1 wherein said sixth means comprises means for combining the filtered original chrominance signal from said second means with the signal having a frequency equal to a sum of those of the reference subcarrier wave and the quasi-subcarrier wave from said fifth means and for forming a difference frequency signal between said combined signals.

Claim 7

Apparatus according to claim 1 wherein said tenth means comprises means for frequency dividing by said m value the frequency of said first subcarrier wave.

Claim 8

Apparatus according to claim 1 wherein said odd integer m in said fourth means is equal to one of 5, 7 or 13, and said odd integer n is equal to one of 3, 5, 9 or 11, n being smaller than m.

Claim 9

Apparatus according to claim 1 wherein said twelfth means comprises means for supplying a bias current to said common magnetic head, said bias current lying in a range between a first value which gives the maximum reproduced output and a second value which is approximately one half of said first value.

Claim 10

Apparatus according to claim 1 wherein said signals recorded on said magnetic medium are subjected to phase fluctuation during said recording, further comprising means for reproducing said new color television signal including: thirteenth means for deriving the recorded signal from said magnetic medium by means of a common magnetic head, said derived signal including the new color television signal component comprising the new luminance and chrominance signal components and the pilot signal component, both having substantially the same phase fluctuation; fourteenth means coupled to said thirteenth means for demodulating said new color television signal component included in said derived signal; fifteenth means coupled to said thirteenth means for detecting said pilot signal component included in said derived signal; sixteenth means coupled to said fifteenth means for multiplying the frequency of said pilot signal component by said n value, thereby forming a signal having a frequency equal to that of said quasi-subcarrier wave; seventeenth means for providing a reference subcarrier wave having a frequency equal to and synchronized with that of said first subcarrier wave; eighteenth means coupled to both said sixteenth and seventeenth means for forming a signal whose frequency corresponds to a sum of The frequencies of the reference subcarrier wave and the frequency-multiplied pilot signal component; nineteenth means coupled to said fourteenth means for filtering out the new chrominance signal component from said new color television signal; twentieth means coupled to both said eighteenth and nineteenth means for changing the frequency of the new chrominance signal component located about the quasi-subcarrier wave back to that of the original chrominance signal component located about said first subcarrier wave; twenty-first means coupled to said fourteenth means for filtering out the new luminance signal component from said new color television signal; and twenty-second means coupled to both said twentieth and twenty-first means for mixing the filtered new luminance signal component with the original chrominance signal component whose frequency has thus been changed back to its initial level, thereby producing a color television signal to be reproduced on a color television receiver, the produced signal being compensated for said phase fluctuation.