US5315633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital video switch for video teleconferencing
Assignee: Unisys Corp
•
Filing: 1991-12-20
•
Granted: 1994-05-24
•
Expires: 2011-12-20
Abstract
Abstract A digital video switch system comprising a smart control terminal is coupled to a digital access controller and to a multipoint control unit. The smart control terminal is provided with a plurality of function keys, each of which is designed to provide automatic interconnection of input and output ports of the digital access controller and the multipoint control unit so that a predetermined interconnection of video and audio signals from remote conferencing sites are interconnected via input/output ports of the digital access controller with each other in a desired format to provide central teleconferencing control of a plurality of sites from a central control site.
Inventors
- 👤 John J. Champa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/14; H04N7/15; H04N7/152
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
308 words
A programmable digital video switch for controlling video teleconferencing comprising; a plurality of conferencing sites, each of said sites having a plurality of video monitors, at least one monitor for active on-site monitoring and at least one monitor for displaying a video signal generated at a remote side, each of said conferencing sites having at least one video camera for generating on-site video and audio camera signals, Compression/Decompression (CODEC) means coupled to said at least one video camera for converting said on-site video and audio camera signals to a predetermined compressed digital format for transmission to a central control site and for decompressing the digital format video and audio camera signals received at said central control site, digital transmission/receiving means coupled to said CODEC means for transmitting and receiving the predetermined compressed digital format audio and video camera signals to and from said central control site, and digital video switch means located at said control central site comprising: digital port interconnection means having a plurality of duplex input/output ports for connecting to said transmission/receiving means coupled to said CODEC means from each of said conferencing sites, said digital port interconnection means further having a plurality of output only ports and a plurality of input only ports, multiport control means for connecting the input only ports to a plurality of said output only ports, and smart terminal control means coupled to said multiport control means for automatically selecting one of said plurality of input only ports and for connecting the selected port to a plurality of said output only ports in response to a predetermined condition remotely programmable at said smart terminal, whereby a combined digital video and audio signal generated at the remote site is selected as an input to said multiport control means and is further selected as a digital output to said plurality of conferencing sites.
Claim 2
Dependent Claim
308 words
A programmable digital video switch for controlling video teleconferencing comprising; a plurality of conferencing sites, each of said sites having a plurality of video monitors, at least one monitor for active on-site monitoring and at least one monitor for displaying a video signal generated at a remote side, each of said conferencing sites having at least one video camera for generating on-site video and audio camera signals, Compression/Decompression (CODEC) means coupled to said at least one video camera for converting said on-site video and audio camera signals to a predetermined compressed digital format for transmission to a central control site and for decompressing the digital format video and audio camera signals received at said central control site, digital transmission/receiving means coupled to said CODEC means for transmitting and receiving the predetermined compressed digital format audio and video camera signals to and from said central control site, and digital video switch means located at said control central site comprising: digital port interconnection means having a plurality of duplex input/output ports for connecting to said transmission/receiving means coupled to said CODEC means from each of said conferencing sites, said digital port interconnection means further having a plurality of output only ports and a plurality of input only ports, multiport control means for connecting the input only ports to a plurality of said output only ports, and smart terminal control means coupled to said multiport control means for automatically selecting one of said plurality of input only ports and for connecting the selected port to a plurality of said output only ports in response to a predetermined condition remotely programmable at said smart terminal, whereby a combined digital video and audio signal generated at the remote site is selected as an input to said multiport control means and is further selected as a digital output to said plurality of conferencing sites.
Claim 3
Dependent Claim
32 words
A programmable digital video switch as set forth in claim 1 wherein said remotely programmable predetermined condition is selectable from a plurality of function keys on a keyboard of said smart terminal.
Claim 4
Dependent Claim
29 words
A programmable digital switch as set forth in claim 1 wherein said smart terminal control means is coupled to said multiport control means through a first standard digital interface.
Claim 5
Dependent Claim
31 words
A programmable digital switch as set forth in claim 1 which further includes a second standard digital interface connected between said digital port interconnection means and said smart terminal control means.
Claim 6
Dependent Claim
35 words
A programmable digital switch as set forth in claim 3 wherein said first standard digital interface is coupled to said port interconnection means for selecting said plurality of output and corresponding input ports for interconnection.
Claim 7
Dependent Claim
28 words
A programmable digital switch as set forth in claim 1 wherein all said input and output ports are formatted to be compatible with a digital T-1 format input.
Claim 8
Dependent Claim
41 words
A programmable digital switch as set forth in claim 6 wherein at least one of said digital ports further comprises a multiplexer at the input/output port for dividing a digital T-1 input line into a plurality of fractional T-1 F lines.
Claim 9
Dependent Claim
69 words
A programmable digital switch as set forth in claim 1 wherein there is provided a plurality of different video format signals from said conferencing sites to be connected to said port interconnection means in digital T-1 format, and at least one of said input ports is provided with a CODEC connected in series with said video format signal for converting said video format signal from analog to digital format.
Claim 10
Dependent Claim
46 words
A programmable digital switch as set forth in claim 8 wherein at least one of said input ports is provided with a channel serving unit connected in series with a plurality of video format signals for converting fractional T-1 format signals to full T-1 format signals.
References Cited (Backward Citations)
US4105973A
Cited
US4456789A
Cited
US4477900A
Cited
US4516156A
Cited
US4645872A
Cited
US4682349A
Cited
US4710917A
Cited
US4730312A
Cited
US5003532A
Cited
US5062136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |