Method of producing a modulated chrominance signal with suppress

Details Method of producing a modulated chrominance signal with suppress Method of producing a modulated chrominance signal with suppress

1984-08-06

1987-02-24

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

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332 44, H04N 1106

Patent

active

046461370

ABSTRACT:
A method of producing a modulated chrominance signal with suppressed carrier. A square-wave carrier signal and a color information signal in the form of a sequence of digitally encoded amplitude values are applied to a modulator arrangement. The clock frequency for the amplitude values is an integral multiple of the color carrier frequency and is phase-locked thereto. Each bit of the amplitude values is inverted during one half cycle of the carrier and not inverted in the subsequent half cycle. A first and a second value, respectively are added to the values obtained thus, these first and second values being calculated such that also for input and/or output signal values which are located at a distance from the drive mean values at the input and output ends a total carrier suppression is achieved for the desired input signal level. The modulated analog chrominance signal is available after digital-to-analog conversion.

REFERENCES:
patent: 4393395 (1983-07-01), Hacke

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