Method of mixing SECAM color-T.V. signals

Details Method of mixing SECAM color-T.V. signals Method of mixing SECAM color-T.V. signals

1978-10-16

1980-01-22

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

041852958

ABSTRACT:
Each one of plural SECAM color-T.V. signals to be mixed is processed as follows: the signal is split into a luminance component and a video-frequency color component; the color component is amplitude-modulated onto a carrier, and the thusly modulated carrier is superimposed onto the respective luminance component to yield a frequency-multiplex signal which is then applied to one respective input channel of a mixer. The output signal of the mixer is split into a mixed luminance component and an amplitude-modulated mixed color component. The latter must be amplitude-demodulated, and then is frequency-modulated and superimposed onto the mixed luminance component to yield the desired mixed SECAM color-T.V. signal. Suppressed carrier amplitude-modulation is used, and each original video-frequency color component has superimposed, during the horizontal blanking intervals, reference oscillations from the carrier used for amplitude-modulation. The carrier signal needed by the amplitude-demodulator is derived from or furnished in dependence upon the amplitude of the reference oscillations in the horizontal blanking intervals of the amplitude-demodulated mixed color component, the reference oscillations having a phase which differs by 90.degree. from the phase which the carrier signal used for amplitude-modulation has outside the horizontal blanking intervals.

REFERENCES:
patent: 3296367 (1967-01-01), Cassagne et al.

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