Library items tagged: implementing

Continual Presence

Anonymous
Tuesday, January 10, 2012 - 16:50
introduction
Videoconferencing
implementing
Vscene
Vscene Desktop
A third option is “Continual Presence” where the picture is segmented to show images of each site continuously, with the sound being voice switched. With continual presence it is important to appreciate that the greater the number of sites and the smaller their individual images the less easy it is to recognise anything meaningful on the viewing screen. It does depend on viewing distance etc. but generally, continual presence is unworkable for more than four sites.
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Chairman Control

Anonymous
Tuesday, January 10, 2012 - 16:50
introduction
videconferencing
implementing
Another option with Multipoint working is “Chairman Control” where all sites receive pictures from the Chair site alone. The Chair site will see images from the remote site currently speaking. All sites receive all sound. 
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Voice Switched Conferences

Anonymous
Tuesday, January 10, 2012 - 16:49
introduction
Videoconferencing
implementing
Multipoint conferences introduce additional constraints. With Point to Point conferences both sites can see and hear each other throughout the conference. With Multipoint conferences it would be unworkable for all sites to be seeing all other sites simultaneously. Normally, therefore, the conference is “voice switched”. In other words, the image of the site speaking takes precedence and is seen by all the other sites. 
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Point to Point and Multipoint

Anonymous
Tuesday, January 10, 2012 - 16:48
Videoconferencing
implementing
introduction
Vscene
v-scene
Conferencing between two sites is termed “Point to Point” and is the most frequently used method. It only requires equipment at each site and the network of choice. If more than two sites require a simultaneous conference, this is termed “Multipoint” conferencing, and an additional specialised piece of equipment is required, called a “Multipoint Control Unit” or MCU. Some videoconferencing CODECs can support limited multipoint working (e.g. up to 4 sites). Generally, MCU’s are very expensive and are rented from service providers just for the duration of a conference.
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