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Multiple clock rate teleconferencing network

  • US 5,072,442 A
  • Filed: 02/28/1990
  • Issued: 12/10/1991
  • Est. Priority Date: 02/28/1990
  • Status: Expired due to Term
First Claim
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1. For use with a communication network in which a plurality of node sites communicate with each other by way of a hub site, wherein a respective node site transmits and receives communication signals at a clock frequency that differs from the clock frequencies at which other node sites of the network transmit and receive communication signals, an apparatus for use at said hub site for enabling said plurality of node sites to simultaneously communicate with each other at their respectively different clock frequencies, via said hub site, comprising:

  • a time division multiplex communication bus having a first portion which accommodates video data signals and a second portion accommodates portion which accommodates audio data signals;

    a plurality of node interface units, each of which is associated with a respective node site and is coupled to receive incoming audio and video communication signals being transmitted from its associated node site at its respective clock frequency and to transmit outgoing audio and video communication signals to its associated node site at its respective clock frequency, and is coupled to said time division multiplex communication bus for interfacing video data signals with the first portion of said time division multiplex communication bus and audio data signals with said second portion of said time division multiplex communication bus; and

    an audio combining unit having a plurality of audio data processing channels respectively associated with the plurality of node sites of said network, each audio data processing channel being coupled to said second portion of said time division multiplex communication bus and combining audio data signals from node sites other than that with which that channel is associated and forwarding combined audio data signals via the second portion of said time division multiplex communication bus to its associated node interface unit.

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