US4145713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite video signal field recognition circuit
Assignee: United States Department of the Navy
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Filing: 1977-08-29
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Granted: 1979-03-20
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Expires: 1997-08-29
Abstract
Abstract An improvement for a stereoscopic system synchronizes a video monitor and aeft-and right-eye viewer. Synchronous operation at a field-by-field rate is triggered by coincidence and noncoincidence of horizontal sync pulses with coincidence pulses derived from the horizontal sync pulses. As a result, the field carrying the left eye image is always connected to the left eye lens of the viewer and the field carrying the right eye image is always coupled to the right eye lens of the viewer.
Inventors
- 👤 Robert E. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
H; H04; H04N; H04N13/00; H04N13/10; H04N13/189; H04N13/30; H04N13/332; H04N13/341
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
In a system having a device for viewing left and right stereoscopic images of composite video signals on a console, an improvement therefor is provided comprising: means connected to the viewing device and coupled to receive the composite video signals for deriving separate positive logical one and negative logical zero triggering signals from horizontal synchronization pulses of one field and the sequential other field of the composite video signals respectively, and for actuating the viewing device with the separate positive logical one and negative logical zero triggering signals to provide the left and right stereoscopic images in synchronization with the field rate of the composite video signals.
Claim 2
Dependent Claim
107 words
In a system having a device for viewing left and right stereoscopic images of composite video signals on a console, an improvement therefor is provided comprising: means connected to the viewing device and coupled to receive the composite video signals for deriving separate positive logical one and negative logical zero triggering signals from horizontal synchronization pulses of one field and the sequential other field of the composite video signals respectively, and for actuating the viewing device with the separate positive logical one and negative logical zero triggering signals to provide the left and right stereoscopic images in synchronization with the field rate of the composite video signals.
Claim 3
Dependent Claim
44 words
An improved system according to claim 1 in which the deriving and actuating means includes an amplifying stage coupled to receive the composite video signal, a filter stage to feed horizontal synchronization signals therethrough and a coincidence pulse stage coupled to generate coincidence pulses.
Claim 4
Dependent Claim
43 words
An improved system according to claim 2 in which the deriving and actuating means further includes a coincidence stage coupled to receive the composite video signal and the coincidence pulses to generate the logical one and logical zero triggering signals in response thereto.
Claim 5
Dependent Claim
37 words
An improved system according to claim 3 in which the coincidence stage includes a timing circuit coupled to regulate the duration of the coincidence pulse to a fraction of the period of time for one line scan.
Claim 6
Dependent Claim
30 words
An improved system according to claim 4 in which the coincidence stage includes a flip flop responsive to coincidence pulses to generate the logical one and logical zero trigger signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |