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Primary Examiner: Martin, John C.
Assistant Examiner:
Attorney: Whitacre; E. M., DeCamillis; M.

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Title: Synchronizing system employing burst crossover detection

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.

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Inventors: Dischert, Robert Adams (Burlington, NJ, US)
Walter, James Morgan (Collingswood, NJ, US)

Application Number: 604670
Filing Date: 1975-08-14
Publication_date: 1977-05-17
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 386/2 348/506
Other Classes:
US Patent Ref:

3103553	Sep, 1963	Newell	358/8.
3637936	Jan, 1972	Krause	358/8.
3921202	Nov, 1975	Dann et al.	358/8.

Other Refs: Other References: 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.