US5576769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic synchronization switch for side-by-side displays
Assignee: Technicolor USA Inc
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Filing: 1994-06-03
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Granted: 1996-11-19
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Expires: 2014-06-03
Abstract
Abstract A video display system comprises a video display for simultaneously displaying pictures representative of first and second video signals, having first and second synchronizing signals respectively. A switch selectably couples the video display with one of the first and second synchronizing signals. A horizontal synchronizing component of the first synchronizing signal is detected by a sensing circuit, the switch being responsive to the sensing circuit. The video display is synchronized with the first synchronizing signal when the horizontal synchronizing component of the first video signal is sensed and is otherwise synchronized with the second synchronizing signal.
Inventors
- 👤 Jeffery B. Lendaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:09
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/445; H04N5/45; H04N5/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
252 words
A video display system, comprising: first means for separating a first synchronizing signal from a first video signal; second means for separating a second synchronizing signal from a second video signal; video display means; means operable in a first mode of operation for implementing a single picture display by supplying said first video signal to said video display means and operable in a second mode of operation for implementing a multiple picture display by supplying a portion of each of said first and second video signals to said video display means; means for indicating operation of said display implementing means in at least one of said first and second modes of operation; switch means coupled for receiving said first and second synchronizing signals as inputs and selectably coupling one of said first and second synchronizing signals to said video display means; means for sensing a synchronizing component of said first video signal; and, control means responsive to said indicating means and said sensing means, operable in said first mode of operation to supply to said video display means an on screen display indicative of loss of signal when said synchronizing component of said first video signal is not sensed, and operable in said second mode of operation for operating said switch means to supply said first synchronizing signal to said video display means when said synchronizing component of said first video signal is sensed and for otherwise operating said switch means to supply said second synchronizing signal to said video display means.
Claim 2
Dependent Claim
252 words
A video display system, comprising: first means for separating a first synchronizing signal from a first video signal; second means for separating a second synchronizing signal from a second video signal; video display means; means operable in a first mode of operation for implementing a single picture display by supplying said first video signal to said video display means and operable in a second mode of operation for implementing a multiple picture display by supplying a portion of each of said first and second video signals to said video display means; means for indicating operation of said display implementing means in at least one of said first and second modes of operation; switch means coupled for receiving said first and second synchronizing signals as inputs and selectably coupling one of said first and second synchronizing signals to said video display means; means for sensing a synchronizing component of said first video signal; and, control means responsive to said indicating means and said sensing means, operable in said first mode of operation to supply to said video display means an on screen display indicative of loss of signal when said synchronizing component of said first video signal is not sensed, and operable in said second mode of operation for operating said switch means to supply said first synchronizing signal to said video display means when said synchronizing component of said first video signal is sensed and for otherwise operating said switch means to supply said second synchronizing signal to said video display means.
Claim 3
Dependent Claim
20 words
The video display system of claim 1, wherein each of said first and second synchronizing signals are composite synchronizing signals.
Claim 4
Dependent Claim
15 words
The video display system of claim 1, wherein said sensing means comprises an active filter.
Claim 5
Dependent Claim
15 words
The video display system of claim 1, wherein said sensing means comprises a bandpass filter.
Claim 6
Dependent Claim
16 words
The video display system of claim 1, wherein said sensing means comprises an active bandpass filter.
Claim 7
Dependent Claim
40 words
The video display system of claim 1, wherein said sensing means comprises: means for generating from said first video signal an intermediate signal including said horizontal synchronizing component; a filter for extracting said horizontal synchronizing component from said intermediate signal.
Claim 8
Dependent Claim
39 words
The system of claim 1, wherein said video signals have format display ratios and said video display means has a format display ratio wider than said format display ratios of said video signals, and said pictures are displayed side-by-side.
Claim 9
Dependent Claim
13 words
The system of claim 7, wherein said pictures are of substantially similar size.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-19 | 2000-05-20 | 2000-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-19 | 2008-05-20 | 2008-11-19 | $7700.00 | Window Closed / Lapsed |