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Desktop Videoconferencing. by Gerald Knezek & Rhonda Christensen. Terminology. Teleconferencing audio combined audio/video videoconferencing implies audio also (continued). (continued) Desktop Videoconferencing One form of Teleconferencing Phone-line based

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Desktop videoconferencing
Desktop Videoconferencing

by

Gerald Knezek

&

Rhonda Christensen


Terminology
Terminology

Teleconferencing

  • audio

  • combined audio/video

  • videoconferencing implies audio also(continued)


(continued)

  • Desktop Videoconferencing

    • One form of Teleconferencing

      • Phone-line based

        • Lumaphone (black &white, $350)

        • Sony, ATT (color, $1K)(continued)


(continued)

  • Internet based

    • Audio system (Internet Phone, Mave, $0-100)

    • Video/keyboard typing system (Original CU SeeMe, free)

    • Combined Audio-Video (Commercial Systems, <$150)


Videoconferencing distinctions
Videoconferencing Distinctions

Frame Refresh Rate

  • > 24 frames per second required to perceive full motion

  • full motion (TV) systems provide 30 FPS

  • partial motion systems provide about 15 FPS

    (continued)


(continued)

  • internet based systems provide 5-15 FPS (CU SeeMe)

  • Slow-Scan TV provides 1 frame every 4 seconds

  • Cost

    • Higher fidelity requires more bandwidth

    • Color costs more

    • Usually trade off audio for video quality


  • Ip addresses
    IP Addresses

    • Unique Identifier (like phone number)

    • 129.120.20.91 for Mac Quadra in 322G

    • 129.120.20.127 for Mac Mac IIsi in 322

      (continued)


    (continued)

    • 129.120.20.2 for CECS Reflector

      • alias pizza.cecs.unt.edu

    • Similar addresses exist for hundreds of public reflectors


    Internet conferencing tools
    Internet Conferencing Tools

    • CU SeeMe (v.68k0.80b2)

      • videoconferencing from Internet (T-1, SLIP, PPP)

      • point to point vs. reflector

        • max 2 participants with former

        • uninvited participants with latter

          (continued)


    (continued)

    • Maven/Internet Phone (v.2.0a37)

      • audioconferencing

      • takes priority over video

    • Special considerations

      • >8 Mb RAM (w/system 7.5) to run both

      • Audio input for AV machines

      • Camera technology


    Reflector site vs point to point
    Reflector Site vs. Point-to-Point

    • Reflector Sites

      • Public

      • Usually allow max. of 8

        (continued)


    (continued)

    • Point-to-Point

      • Private

      • Allows max of 2 for CU SeeMe (Mac)

      • Allows max of 8 with Maven

    • Private Reflectors

      • restricted access through code

      • combines privacy and multiple access rights



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