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In 1995 the first public videoconference between North America and Africa took place, linking a technofair in San Francisco with a techno-rave and cyberdeli in Cape Town.At the Winter Olympics opening ceremony in Nagano, Japan, Seiji Ozawa conducted the Ode to Joy from Beethoven's Ninth Symphony simultaneously across five continents in near-real time.
This technique was very expensive, though, and could not be used for applications such as telemedicine, distance education, and business meetings.During the first manned space flights, NASA used two radio-frequency (UHF or VHF) video links, one in each direction.TV channels routinely use this type of videotelephony when reporting from distant locations.During this time, there was also research into other forms of digital video and audio communication.Many of these technologies, such as the Media space, are not as widely used today as videoconferencing but were still an important area of research.At the dawn of its commercial deployment from the 1950s through the 1990s, videotelephony also included "image phones" which would exchange still images between units every few seconds over conventional POTS-type telephone lines, essentially the same as slow scan TV systems.
The development of advanced video codecs, more powerful CPUs, and high-bandwidth Internet telecommunication services in the late 1990s allowed videophones to provide high quality low-cost colour service between users almost anyplace in the world that the Internet is available.
Although not as widely used in everyday communications as audio-only and text communication, useful applications include sign language transmission for deaf and speech-impaired people, distance education, telemedicine, and overcoming mobility issues.
It is also used in commercial and corporate settings to facilitate meetings and conferences, typically between parties that already have established relationships.
This was first embodied in the device which came to be known as the video telephone, or videophone, and it evolved from intensive research and experimentation in several telecommunication fields, notably electrical telegraphy, telephony, radio, and television.
Simple analog videophone communication could be established as early as the invention of the television.
Attempts at using normal telephony networks to transmit slow-scan video, such as the first systems developed by AT&T Corporation, first researched in the 1950s, failed mostly due to the poor picture quality and the lack of efficient video compression techniques.