Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1975-12-17
1977-03-01
Richardson, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 8, H04N 579, H04N 5795
Patent
active
040104907
ABSTRACT:
A color video signal recording system comprises a frequency modulator for frequency modulating a carrier with a luminance signal separated from an input color video signal. A frequency converter converts a carrier chrominance signal separated from the input color video signal. The separation provides a frequency band which is lower than the band of the frequency modulated luminance signal. Video heads successively record a mixed signal formed by mixing the frequency modulated luminance signal and the frequency converted carrier chrominance signal. Recording is made along a plurality of parallel tracks on a magnetic recording medium. The frequencies f1 and f2 are applied alternately to the frequency converter every time that the video heads scans the tracks. The frequencies f1 and f2 are selected at respective values which satisfy the equation f1 - f2 = (N/2)f.sub.H, where N is an odd integer, and f.sub.H is the horizontal scanning frequency. The frequency of the frequency converted carrier chrominance signal, in the mixed signal recorded in each track, differs by (N/2)f.sub.H from the frequency recorded in an adjacent track. The system for reproducing a color video signal thus recorded comprises video heads for reproducing the signal thus recorded by the above recording system. The reproducing signal includes a demodulator for demodulating the frequency modulated luminance signal which is separated from the reproduced signal. A frequency converter reconverts the frequency converted carrier chrominance signal separated from the reproduced signal, with a signal for causing a different frequency conversion at every scanning of the video heads. The reconverted frequency always becomes the original carrier chrominance signal frequency. A comb filter passes only the normal carrier chrominance signal in the output of the frequency converter and removes the crosstalk components. A mixer mixes the output of the demodulator with the output of the comb filter and obtains a reproduced color video signal.
Richardson Robert L.
Victor Company of Japan , Limited
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