Color-television receiver with at least one digital integrated c

Details Color-television receiver with at least one digital integrated c Color-television receiver with at least one digital integrated c

1982-06-15

1985-01-01

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 19, H04N 946, H04N 902

Patent

active

044918623

ABSTRACT:
To digitally synchronize the chrominance-subcarrier oscillator in the form of a phase-locked loop with the color burst contained in the composite color signal, suitable digital subcircuits are provided. During the keying pulse, the digital R-Y and B-Y color-difference signals are accumulated line by line. The corresponding R-Y value is then added to a desired phase value or a tint-control value, and for deviations from the burst phase between +90.degree. and -90.degree., the sum signal, after being limited if necessary, is applied to a digital-to-analog converter, filtered in a low-pass filter, and then used to control the chrominance-subcarrier oscillator. If the phase deviations lie between +90.degree. and +180.degree. or -90.degree. and -180.degree., the digital-to-analog converter is constantly fed with the upper or the lower limit value, respectively, via a switching stage. The latter has three switch positions, one for direct transfer and one for each of the two limit values, with the sign bit of the accumulated R-Y or B-Y value effecting the appropriate selection.

REFERENCES:
patent: 4251831 (1981-02-01), Kamath
patent: 4352123 (1982-09-01), Flamm

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