Circuit to vary the phase of the color burst signal

Details Circuit to vary the phase of the color burst signal Circuit to vary the phase of the color burst signal

1983-07-22

1985-11-05

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 19, H04N 946, H04N 9535

Patent

active

045517495

ABSTRACT:
One color difference signal, for example, (B-Y) is modulated by a signal from a constant frequency wave generator which is phase-shifted by 90 degrees and other color difference signal (R-Y) is modulated by a signal generated from the constant frequency wave generator after the color difference signal (R-Y) is added with a predetermined DC level during a predetermined duration. This predetermined DC level is controlled by a variable resistor, and the predetermined duration is determined by a burst flag pulse. The modulated signals of the both color difference signals (R-Y), (B-Y) are mixed by a mixer.

REFERENCES:
patent: 2904628 (1959-09-01), Haantjes et al.
patent: 3534157 (1970-10-01), Skrydstrup
patent: 4479141 (1984-10-01), Van Der Valk

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