Color burst forming circuit and color burst gate pulse forming c

Details Color burst forming circuit and color burst gate pulse forming c Color burst forming circuit and color burst gate pulse forming c

1997-01-23

1998-06-30

Kostak, Victor R.

Television

Synchronization

Phase locking regenerated subcarrier to color burst

348505, H04N 9455

Patent

active

057741840

ABSTRACT:
A color burst gate pulse forming circuit has a first counter, a second counter, a logic circuit, and a decoding circuit. The first counter counts a chrominance subcarrier supplied in a form of a clock. The second counter starts counting said chrominance subcarrier in synchronization with a horizontal synchronizing signal, and resets itself in a period longer than half a horizontal scanning period and shorter than one horizontal scanning period. The logic circuit controls the operating period of the first counter based on an output from the second counter and said horizontal synchronizing signal. The decoding circuit decodes a count output from the first counter, and outputs color burst gate pulses based on a predetermined count output.

REFERENCES:
patent: 4695873 (1987-09-01), Smith
"Colour Encoding and Decoding Techniques for Line-Locked Sampled PAL and NTSC Television Signals C.K.P. Clarke, B.Sc. (Eng.), A.C.G.I.", Research Dept., Engineering Division, British Broadcasting Corporation, Mar. 1986.

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