US3794758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectable display system
Assignee: Data Plex Systems Inc
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Filing: 1972-07-25
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Granted: 1974-02-26
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Expires: 1992-07-25
Abstract
Abstract There is disclosed a selectable display system wherein fields and/or frames of television signals are dividable into quadrants and stored in a video tape recorder. As the recorder transmits the signals to a television display device, video signals in particular lines of the fields assist in the selection by a viewer through the agency of selector switches which quadrant is to be displayed.
Inventors
- 👤 D Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:41
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
186 words
Apparatus for combination with a television transmitter which transmits at least video signals and horiZontal and vertical synchronizing signals to a television viewer having circuits which generate a line (or) raster in response to received horizontal and vertical synchronizing signals and video circuits which display visual information in response to received video signals, to select portions of at least a field of video signals for display comprising line selecting means responsive to (the) at least the horizontal synchronizing signals of the television transmitter for selecting at least one particular line of the line raster of a field, detector means cooperating with said line selecting means for detecting a particular video signal in said particular line, generator means operative if said particular video signal is detected in said particular line for generating video blanking control signals synchronized to at least one of the synchronizing signals, each of said generated video blanking control signals being related to a particular portion of the field, and subject operable switch means for selecting which of said generated video blanking control signals is transmitted to the video circuits of the television receiver.
Claim 2
Dependent Claim
186 words
Apparatus for combination with a television transmitter which transmits at least video signals and horiZontal and vertical synchronizing signals to a television viewer having circuits which generate a line (or) raster in response to received horizontal and vertical synchronizing signals and video circuits which display visual information in response to received video signals, to select portions of at least a field of video signals for display comprising line selecting means responsive to (the) at least the horizontal synchronizing signals of the television transmitter for selecting at least one particular line of the line raster of a field, detector means cooperating with said line selecting means for detecting a particular video signal in said particular line, generator means operative if said particular video signal is detected in said particular line for generating video blanking control signals synchronized to at least one of the synchronizing signals, each of said generated video blanking control signals being related to a particular portion of the field, and subject operable switch means for selecting which of said generated video blanking control signals is transmitted to the video circuits of the television receiver.
Claim 3
Dependent Claim
40 words
The apparatus of claim 1 wherein said line selecting means comprises means for counting the number of horizontal synchronizing signals occurring after a vertical synchronizing signal and generating a first line selecting signal when a first particular count is reached.
Claim 4
Dependent Claim
26 words
The apparatus of claim 2 wherein said detector means includes means for indicating the coincidence of said first line selecting signal and said particular video signal.
Claim 5
Dependent Claim
56 words
The apparatus of claim 1 wherein said generator means comprises a triggered square wave generator for generating at least one cycle of a square wave signal when triggered by a particular one of the synchronizing signals, the period of said square wave signal being related to the frequency of said particular one of the synchronizing signals.
Claim 6
Dependent Claim
40 words
The apparatus of claim 4 wherein said line selecting means comprises means for counting the number of horizontal synchronizing signals occurring after a vertical synchronizing signal and generating a first line selecting signal when a first particular count is reached.
Claim 7
Dependent Claim
26 words
The apparatus of claim 5 wherein said detector means includes means for indicating the coincidence of said first line selecting signal and said particular video signal.
Claim 8
Dependent Claim
27 words
The apparatus of claim 2 wherein said line selecting means further comprises means for generating a second line selecting signal when a second particular count is reached.
Claim 9
Dependent Claim
69 words
The apparatus of claim 7 wherein said detector means comprises first coincidence means for indicating the coincidence of said first line selecting signal and a particular video signal occurring in the line associated with said first line selecting signal, and second coincidence means for indicating the coincidence of said second line selecting signal and a particular video signal occurring in the line associated with said second line selecting signal.
Claim 10
Dependent Claim
136 words
The apparatus of claim 8 wherein said generator means comprises a first triggered square wave generator for generating one cycle of a first square wave signal and the inverse thereof when triggered by a horizontal synchronizing signal the period of said first square wave signal being related to the frequency of said horizontal synchronizing signal, and a second triggered square wave generator for generating one cycle of a second square wave signal and the inverse thereof when tirggered by a vertical synchronizing signal, the period of said second square wave signal being related to the frequency of said vertical synchronizing signal, said first triggered square wave generator being operative only when said first coincidence means gives an indicator and said second triggered square wave generator being operative only when said second coincidence means gives an indicator.
Claim 11
Dependent Claim
135 words
The apparatus of claim 9 wherein said generator means further comprises a first AND-logic means for transmitting a signal durIng the simultaneous occurrence of a first level of said first square wave signal and a first level of said second square wave signal, a second AND-logic means for transmitting a signal during the simultaneous occurrence of a second level of said first square wave signal and the first level of said second square wave signal, a third AND-logic means for transmitting a signal during the simultaneous occurrence of the first logic level of said first square wave signal and a second logic level of said second square wave signal, and fourth AND-logic means for transmitting a signal during the simultaneous occurrence of the second levels of each of said first and second square waves 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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |