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VIDEO
CONFERENCING
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. It
differs from videophone in that it is designed to serve
a conference rather than individuals.Video conferencing
uses telecommunications of audio and video to bring
people at different sites together for a meeting. This
can be as simple as a conversation between two people in
private offices (point-to-point) or involve several
sites (multi-point) with more than one person in large
rooms at different sites. Besides the audio and visual
transmission of people, video conferencing can be used
to share documents, computer-displayed information, and
whiteboards.
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.
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