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Method and apparatus for video broadcasting and teleconferencing

  • US 5,157,491 A
  • Filed: 08/27/1990
  • Issued: 10/20/1992
  • Est. Priority Date: 10/17/1988
  • Status: Expired due to Term
First Claim
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1. A network for providing video teleconferencing capability among several remote sites, comprising:

  • a) central switching means for receiving and processing signals from the remote sites;

    b) means for generating video signals at the remote sites;

    c) means for transmitting said video signals to said central switching means;

    d) said central switching means including;

    i) means for allocating a different channel to said video signals from each one of the remote sites, each channel being indicative of one of the remote sites and having a predetermined carrier frequency;

    ii) means for scanning said allocated channels to generate signals identificative of said allocated channels;

    iii) means for feeding back said channel identifying signals to the remote sites over a first carrier frequency;

    iv) multiplexer means for compressing and multiplexing said video signals of said allocated channels, said multiplexer means including means for modulating said video signals over a second carrier frequency, sand said video signals being modulated over said predetermined carrier frequencies of their respective channels and over said second carrier frequency; and

    v) means for transmitting said multiplexer signals from said central switching means to the selecting remote sites; and

    e) each remote site including;

    i) selection means for using said feedback channel identifying signals to selectively identify and select the channels to be revised by each remote site;

    ii) means for receiving said multiplexed signals;

    iii) means for demultiplexing and separating said received signals into separate channels;

    iv) means for storing the separated signals for a predetermined period of time;

    v) means for decompressing and reconstructing the signals of the selected channel on a real-time basis; and

    vi) monitor means for displaying the reconstructed signals of the selected channel on a real-time basis.

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