Vectorscope automatic burst positioning

Details Vectorscope automatic burst positioning Vectorscope automatic burst positioning

1991-03-27

1992-12-29

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 25, 358 28, H04N 1702

Patent

active

051756145

ABSTRACT:
Vectorscope automatic burst positioning for properly aligning a vectorscope display uses a microprocessor (22) to control a phase shifter (14) according to the amplitudes of the chrominance components demodulated from an input color video signal during the burst interval. The demodulated chrominance components are sampled and digitized (18), and the digitized values are tested to determine whether they fall within a predetermined window. The microprocessor applies a statistical approach over a range of phase values to compute a final phase control signal value for the phase shifter that properly aligns the vectorscope display.

REFERENCES:
patent: 3820156 (1974-06-01), Schulz
patent: 4488168 (1984-12-01), Mino

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