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Video
and audio communication between two or more parties via a video-codec
(coder/decoder) at either end linked by digital circuits. Formerly
needing in excess of 300Mbit/s bandwidth, systems are now available
offering acceptable quality for general use at 128Kbit/s and
high-quality 71KHz audio. Factors influencing the growth of
videoconferencing are improved compression technology, H.323
technology, low-cost switched digital networks - particularly
ISDN - the emergence of standards and applications. Main players
include Vtel, PictureTel and Polycom.
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