Gourt > Business > Business Services > AudioVisual > Videoconferencing (11)
A videoconference (also known as a videoteleconference) is a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously. It has also been called visual collaboration and is a type of groupware.
History
Simple analog videoconferences could be established as early as the invention of the television. Such videoconferencing systems consisted of two closed-circuit television systems connected via cable. During the first manned space flights, NASA used two radiofrequency (UHF or VHF) links, one in each direction. TV channels routinely use this kind of videoconferencing when reporting from distant locations, for instance. Then mobile links to satellites using special trucks became rather common. This technique was very expensive, though, and could not be used for more mundane applications, such as telemedicine, distance education, business meetings, and so on, particularly in long-distance applications. Attempts at using normal telephony networks to transmit slow-scan video, such as the first systems developed by AT&T, failed mostly due to the poor picture quality and the lack of efficient video compression techniques. It was only in the 1980s that digital telephony transmission networks became possible, such as ISDN, assuring a minimum bandwidth (usually 128 kilobits/sec) for compressed video and audio transmission. The first dedicated systems, such as those manufactured by pioneering VTC firms, like PictureTel, started to appear in the market as ISDN networks were expanding throughout the world. Video teleconference systems throughout the 1990's rapidly evolved from highly expensive proprietary equipment, software and network requirements to standards based technology that is readily available to the general public at a reasonable cost. Finally, in the 1990s, IP (Internet Protocol) based videoconferencing became possible, and more efficient video compression technologies were developed, permitting desktop, or personal computer (PC)-based videoconferencing. In 1992 CU-SeeMe was developed at Cornell by Tim Dorcey et al. VTC arrived to the masses and free services and software, such as NetMeeting, MSN Messenger, Yahoo Messenger, and others brought cheap, albeit low-quality, VTC.
Technology
The core technology used in a videoteleconference (VTC) system is digital compression of audio and video streams in real time. The hardware or software that performs compression is called a codec (coder/decoder). Compression rates of up to 1:500 can be achieved. The resulting digital stream of 1's and 0's is subdivided into labelled packets, which are then transmitted through a digital network of some kind (usually ISDN or IP). The use of audio modems in the transmission line allow for the use of POTS, or the Plain Old Telephone System, in some low-speed applications, such as videotelephony, because they convert the digital pulses to/from analog waves in the audio spectrum range. More on [ Videoconferencing ]
Conferencing :: Services
On the Web :: Internet
Internet Telephony
Collaborative Learning :: Online Training
Telemedicine :: Informatics
Videoconferencing :: Distance Learning
Distance Learning :: Products and Services
Apple Tablet to be launched next 26th Jan. supposed w/h videoconferencing,e-books,Internet,user-friendly interface, and other functions.
gippopippo (Cosimo Cannata) Sat, 02 Jan 2010 13:03:50 -0000
Apple Tablet to be launched next 26th Jan. supposed w/h videoconferencing,e-books,Internet,user-friendly interface, and other functions.
Videoconferencing Improves the Education System | Special Education http://bit.ly/61GGCq
jonver0123 (jonver nortez) Sat, 02 Jan 2010 10:10:15 -0000
Videoconferencing Improves the Education System | Special Education http://bit.ly/61GGCq
RT @MPIWC: Best Web And Videoconferencing Alternatives For Small Companies - http://ow.ly/RROU #eventprofs #MPI
nam2celestino (nam2 celestino) Sat, 02 Jan 2010 09:47:29 -0000
RT @MPIWC: Best Web And Videoconferencing Alternatives For Small Companies - http://ow.ly/RROU #eventprofs #MPI
Best Web And Videoconferencing Alternatives To WebEx, Live Meeting, Centra For Small Companies - http://ow.ly/RROU #eventprofs #MPI
MPIWC (MPI WestField) Sat, 02 Jan 2010 06:45:15 -0000
Best Web And Videoconferencing Alternatives To WebEx, Live Meeting, Centra For Small Companies - http://ow.ly/RROU #eventprofs #MPI
RT @BobPrestonCCO: #videoconferencing market annual growth @ 17.8 percent according to Gartner, Inc. #Polycom offers ultimate flexibility
AtikanGlobal (Atikan Global) Sat, 02 Jan 2010 01:45:48 -0000
RT @BobPrestonCCO: #videoconferencing market annual growth @ 17.8 percent according to Gartner, Inc. #Polycom offers ultimate flexibility
Does anyone have tips for any good videoconferencing software BESIDES skype?
ALT82 (~Miss Lisa~) Sat, 02 Jan 2010 01:28:11 -0000
Does anyone have tips for any good videoconferencing software BESIDES skype?
Wainhouse Research - Publishes news bulletins, articles, whitepapers, and industry reports, produces seminars, and provides consulting services related to the visual collaboration and rich media communications marketplace.
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Amigo Latino - Videoconferencing services at low cost, for families and organizations, between the United States and Latin America.
Atlanta Visual Dynamics - Video communications solutions in Atlanta, Georgia.
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CIT - Company specializing in wireless videoconferencing and wireless video utilizing ISDN or IP.
Forgent Networks - Video network scheduling software and services company with global partners and alliances.
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Mobile Information Integration - Portable briefcase videoconferencing solutions.
VFI - Videoconference furniture from monitor stands to podiums for distance learning.
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Video Conferencing Jobs - Site offers videoconferencing jobs only with a global online jobs database for both employers and job seekers.
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Videoconference Depositions - Videoconference deposition resource for lawyers and court reporters. Quick estimates for video conferencing depositions.
Videoconferencing Insider - Articles and commentary on the videoconferencing industry.
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VTCTalk - Online forum for videoconferencing professionals. Engineers can meet and discuss relevant topics.
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Zibex - Video tele-banking applications. Banking services using videoconference technology.
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