US3816658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing sync pulses on a single conductor to a plurality of television cameras
Assignee: Singer Co
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Filing: 1972-10-31
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Granted: 1974-06-11
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Expires: 1992-10-31
Abstract
Abstract Horizontal and vertical sync pulses synchronized to a central sync generator are provided to a plurality of TV cameras through respective single cables. In response to horizontal and vertical sync pulses provided by the sync generator, an encoder circuit provides encoded pulses on one end of the cables. A plurality of decoder circuits respectively connected to each of the other ends decodes the encoded pulses and provides the synchronized horizontal and vertical sync pulses to the cameras. In the absence of the encoded pulses, unsynchronized sync pulses are automatically provided by the decoder circuits.
Inventors
- 👤 N Vidovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:31
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/06; H04N5/067; H04N5/073; H04N5/0733
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
313 words
A system for providing horizontal and vertical sync signals to TV apparatus from a sync generator on a single conductor of an interconnecting cable comprising: a first signal generator for generating a first pair of pulse trains suitable for providing horizontal and vertical synchronization to TV apparatus; en encoder connected to said signal generator and responsive to said first pair of pulse trains for providing an output signal which selectably switches between four amplitude levels to generate a series of pulses having the same repetition rate as one pulse train of said pair of pulse trains, the first amplitude level occurring only when pulses from both pulse trains are simultaneously absent, the second amplitude level occurring only when a pulse from the first pulse train of said first pair of pulse trains is present and a pulse from the second pulse train of said first pair of pulse trains is absent, said third amplitude level occurring only when a pulse from both pulse trains of said first pair are simultaneously present, said fourth amplitude level occurring only when a pulse from said second pulse train of said first pair is present and a pulse from said first pulse train of said first pair is absent; and a decoder connected to said encoder and responsive to said output signal for generating a second pair of pulse trains synchronized with said first pair of pulse trains to provide horizontal and vertical synchronization to TV apparatus connected thereto, pulses in one pulse train of said second pair of pulse trains being generated only in response to those pulses of said series of pulses having either said second or third amplitude levels and pulses in the other pulse train of said second pair of pulse trains being generated only in response to those pulses of said series of pulses having either said third or fourth amplitude levels.
Claim 2
Independent Claim
313 words
A system for providing horizontal and vertical sync signals to TV apparatus from a sync generator on a single conductor of an interconnecting cable comprising: a first signal generator for generating a first pair of pulse trains suitable for providing horizontal and vertical synchronization to TV apparatus; en encoder connected to said signal generator and responsive to said first pair of pulse trains for providing an output signal which selectably switches between four amplitude levels to generate a series of pulses having the same repetition rate as one pulse train of said pair of pulse trains, the first amplitude level occurring only when pulses from both pulse trains are simultaneously absent, the second amplitude level occurring only when a pulse from the first pulse train of said first pair of pulse trains is present and a pulse from the second pulse train of said first pair of pulse trains is absent, said third amplitude level occurring only when a pulse from both pulse trains of said first pair are simultaneously present, said fourth amplitude level occurring only when a pulse from said second pulse train of said first pair is present and a pulse from said first pulse train of said first pair is absent; and a decoder connected to said encoder and responsive to said output signal for generating a second pair of pulse trains synchronized with said first pair of pulse trains to provide horizontal and vertical synchronization to TV apparatus connected thereto, pulses in one pulse train of said second pair of pulse trains being generated only in response to those pulses of said series of pulses having either said second or third amplitude levels and pulses in the other pulse train of said second pair of pulse trains being generated only in response to those pulses of said series of pulses having either said third or fourth amplitude levels.
Claim 3
Dependent Claim
57 words
Apparatus according to claim 1 wherein said decoder further comprises: a second signal generator for generating a third pair of pulse trains suitable for providing horizontal and vertical synchronization to said TV apparatus; and circuitry for connecting said third pair of pulse trains to said TV apparatus in the absence of said series of pulses being generated.
Claim 4
Dependent Claim
73 words
Apparatus according to claim 1 wherein said one pulse train of said second pair of pulse trains provides horizontal synchronization to said TV apparatus and is synchronized with said first pulse train of said first pair of pulse trains, and said other pulse train of said second pair of pulse trains provides vertical synchronization to said TV apparatus and is synchronized with said second pulse train of said first pair of pulse trains.
Claim 5
Dependent Claim
53 words
Apparatus according to claim 2 wherein said circuitry comprises: a capacitor which charges to a voltage greater than a known voltage in response to said monodrive pulses; and means connected to said capacitor for providing said unsynchronized sync pulses in response to said capacitor discharging to a voltage less than said known voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |