US3961137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biphase digital television systems
Assignee: Independent Broadcasting Authority
•
Filing: 1974-07-30
•
Granted: 1976-06-01
•
Expires: 1994-07-30
Abstract
Abstract Apparatus for processing groups of digital data for transmission comprises a run-in signal generator for providing at the output of the apparatus an output in which the groups of data are each preceded by a run-in signal, said apparatus being so constituted that the output is in the form of digital signals of the complemented type, and a start code generator operable to provide a start code with at least one break of complementation and arranged to insert a start code between each group and its preceding run-in signal.
Inventors
- 👤 Peter Richard Hutt
- 👤 Alan Ronald Blake
- 👤 Gunter VON Cavallar
- 👤 Brian Neil Douglas
- 👤 Philip John Dodds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
H; H03; H03M; H03M5/00; H04; H04N; H04N7/00; H04N7/08; H04N7/087; H04N7/088; H04N7/0882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
Apparatus for processing groups of binary digital information, each group consisting of a series of binary digits for transmission, which apparatus comprises a bi-phase generator for converting the digits of the groups to a bi-phase digital form in which each digit is represented by a transition from a first signal level to a second signal level and the digits of the group are accordingly all represented by signals of the first level complemented by signals of the second level, a start code generator operable to provide repeatedly a binary digital start code of said bi-phase digital form but with a break of said complementation, a run-in signal generator operable to provide a run-in signal and means for feeding trains of output signals to an output from the apparatus at spaced-apart intervals of time each train of output signals having a run-in signal from the run-in signal generator followed by a start code, from said start code generator, with said break of complementation and then by one of said groups in said bi-phase digital form.
Claim 2
Dependent Claim
174 words
Apparatus for processing groups of binary digital information, each group consisting of a series of binary digits for transmission, which apparatus comprises a bi-phase generator for converting the digits of the groups to a bi-phase digital form in which each digit is represented by a transition from a first signal level to a second signal level and the digits of the group are accordingly all represented by signals of the first level complemented by signals of the second level, a start code generator operable to provide repeatedly a binary digital start code of said bi-phase digital form but with a break of said complementation, a run-in signal generator operable to provide a run-in signal and means for feeding trains of output signals to an output from the apparatus at spaced-apart intervals of time each train of output signals having a run-in signal from the run-in signal generator followed by a start code, from said start code generator, with said break of complementation and then by one of said groups in said bi-phase digital form.
References Cited (Backward Citations)
US2700155A
Cited
US3156893A
Cited
US3419804A
Cited
US3458835A
Cited
US3509277A
Cited
US3479451A
Cited
US3514706A
Cited
US3491199A
Cited
US3576391A
Cited
US3726992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |