http://www.alshek.com/video-teleconference/
Understanding teleconference systems
Teleconferencing is one of those fuzzy, multi-definition terms whose definition often depends on the equipment one has access to. In general, teleconferencing is the ability to involve more than two parties in a “phone” call. I use the term “phone” loosely, as the call could be audio or video, over regular phone lines, ISDN, or VoIP, or using equipment other than a traditional phone.
I like to think of this in 3 catagories: speakerphones, local bridges, and remote bridges.
Speakerphones, especially those designed to sit in the middle of a table and service multiple people, are often called teleconferencers. These phones typically have unique microphone and loudspeaker features to allow participants in a local meeting to communicate with remote participants as if those participants were in the same room (or at least a reasonable approximation). That’s the conferencing part – multiple people in the same room hearing and being heard. Most videoconferencing systems fall into this catagory as well, with a video shot of all the local participants added to the audio.
Local bridges allow a small number of remote participants to be on the same call and be able to hear and be heard by all others. A local brige might be located in a building’s PBX, or in the phone itself in the case of some of the newer VoIP phones. Many are familiar with this feature as conference calling. Typically, the audio from all calls (except their own) is sent to all other calls.
Remote bridges, sometimes called MCUs, are scaled up versions of local bridges designed specifically for the purpose of joining a large number of audio and video callers into a single call. MCUs are expensive big-iron and are typically used in an enterprise back room, or at a service provider facility, and usually require an advance reservation. These devices provide special processing to select the top few active talkers and transmit only those talkers to the other users, preventing execessive noise. These types of bridges are often used for one-to-many conferences, such as a corporate meeting or earnings call.
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Visit www.Teleconferencings.info for more information about international conference call
Pseudo-3D Video Conferencing with a Generic Webcam (Chris Harrison, Scott Hudson) – ISM ’08
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