Synchronizing system employing burst crossover detection

Details Synchronizing system employing burst crossover detection Synchronizing system employing burst crossover detection

1975-08-14

1977-05-17

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 19, 358 8, H04N 946

Patent

active

040245713

ABSTRACT:
A synchronizing system separates the synchronizing components from a composite video signal into signal components representing horizontal sync and color burst. The leading edge of the horizontal sync component is used to develop a timing signal which is compared with the positive and negative averaged burst signal from a band pass filter tuned to the burst frequency. Comparators drive respective flip-flops arranged to provide both negative and positive burst signal outputs at a selected burst signal crossover near the end of the original burst signal.
A gate circuit coupled to the flip-flop output terminals develops a line start signal which contains the leading edge of the incoming signal sync information corrected to a selected color burst. The synchronizing circuit also provides a substitute signal in the absence of the color burst component to maintain system synchronization.

REFERENCES:
patent: 3103553 (1963-09-01), Newell
patent: 3637936 (1972-01-01), Krause
patent: 3921202 (1975-11-01), Dann et al.
Coleman, "A New Technique for Time-Base Stabilization of Video Recorders," IEE Transactions on Broadcasting, vol. BC-17, No. 1, Mar. 1971, pp. 29-36.
Edwardson, "The Digital Timing Correction of Video Tape Recorded Colour Television Signals," Proceedings of the Conference on Video and Data Recording, Birmingham, England, 10-12 July 1973, pp. 27-39.

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