Videotelephony

（重定向自Video telephony）

An upscale Teliris VirtuaLive telepresence system in use (2007).

Artist's conception: 21st century videotelephony imagined in the early 20th century (1910).

A modern Avaya Nortel 1535 IP model broadband videophone (2008).

An older dual-display Polycom videoconferencing system (2008).

Videotelephony comprises the technologies for the reception and transmission of audio-video signals by users at different locations, for communication between people in real-time.

At the dawn of the technology, 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.

单词	Video telephony
释义	Video telephony 英语百科 Videotelephony （重定向自Video telephony） Videotelephony comprises the technologies for the reception and transmission of audio-video signals by users at different locations, for communication between people in real-time. At the dawn of the technology, 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.
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