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Video Telephones

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ALSO CALLED: Videophones, Internet Videophones, Video Phones
DEFINITION: Video telephony is full-duplex, real-time audio-visual communication between or among end users. The idea of the video telephone, also called the videophone, is about as old as the telephone itself.The primary challenge facing developers of the video telephone is the fact that full-motion, high-resolution video data requires far more bandwidth than audio data. This is true whether the signals are analog  … 
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VIDEO TELEPHONES DEFINITION (continued): …  or digital. The bandwidth of a video signal can be minimized by using the lowest image resolution that will give acceptable results, by settling for grayscale rather than color imagery, and by transmitting non-moving images at intervals of several seconds rather than a continuous, full-motion image. A video signal of this type, which is a form of slow-scan television (SSTV), can be transmitted and received over ordinary copper telephone lines.Broadband Internet solutions such as DSL (Digital Subscriber Line), cable, and land-based wireless make it possible to transmit and receive video data at … 
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