US4069504A
Expired / Lapsed
US
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Digital transmission method for coded video signals
Assignee: Societe Anonyme de Telecommunications SAT
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Filing: 1976-06-23
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Granted: 1978-01-17
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Expires: 1996-06-23
Abstract
Abstract A method for the digital transmission of coded video signals with a fixed number of binary digits per frame dot, wherein each line of the video signal comprises a line synchronization word multiplexed during the line fly-back period, comprising using as line synchronization-word a pseudorandom sequence the self-correlation function of which is such that the synchronization word can be detected at the receiving equipment within a window of at least 3 binary digits, and stuffing each line of the video signal by eventually adding or subtracting one binary digit during the line flyback period at a fixed location in relation to the line synchronizing word.
Inventors
- 👤 Jean-Claude Jolivet
- 👤 Francois-Xavier Antoine Stouls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:26
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/07; H04N; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N7/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A method for the digital transmission of coded video signals with a fixed number of binary digits per frame dot, wherein each line of the video signal comprises a line synchronization word multiplexed during the line fly-back period, comprising using as line synchronization-word a pseudorandom sequence the self-correlation function of which is such that the synchronization word can be detected at the receiving equipment within a window of at least 3 binary digits, and stuffing each line of the video signal by eventually adding or substracting one binary digit during the line fly-back period at a fixed location in relation to the line synchronizing word.
Claim 2
Independent Claim
105 words
A method for the digital transmission of coded video signals with a fixed number of binary digits per frame dot, wherein each line of the video signal comprises a line synchronization word multiplexed during the line fly-back period, comprising using as line synchronization-word a pseudorandom sequence the self-correlation function of which is such that the synchronization word can be detected at the receiving equipment within a window of at least 3 binary digits, and stuffing each line of the video signal by eventually adding or substracting one binary digit during the line fly-back period at a fixed location in relation to the line synchronizing word.
References Cited (Backward Citations)
US3506785A
Cited
US3755624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |