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Three-party conference circuit for digital time-division-multiplex communication systems

  • US RE31,814 E
  • Filed: 06/28/1982
  • Issued: 01/22/1985
  • Est. Priority Date: 07/02/1979
  • Status: Expired due to Term
First Claim
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1. A conference circuit for combining digitized speech signals received from groups of three parties in corresponding .Iadd.consecutive .Iaddend.channels of an incoming time-division-multiplex (TDM) highway, having a predetermined number of channels, to provide combined speech signals for transmission to the parties in corresponding .Iadd.consecutive .Iaddend.channels of an outgoing TDM highway, having a predetermined number of channels, said conference circuit comprising:

  • first, second and third register means .[.repetitively.]. .Iadd.sequentially .Iaddend.coupled one after another to the incoming TDM highway for storing .[.the.]. .Iadd.different .Iaddend.speech signals from .[.every third channel.]. .Iadd.successive groups of three channels.Iaddend.;

    multiplexing means coupled to the first, second and third register means for .Iadd.sequentially .Iaddend.selecting .Iadd.the speech signals in .Iaddend.different pairs of the register means, said multiplexing means selecting the .Iadd.speech signals in the .[.second .]. .Iadd.first .Iaddend.and .[.third.]. .Iadd.second .Iaddend.register means .[.when.]. .Iadd.after .Iaddend.speech signals .Iadd.of the first two channels in a group of three channels .Iaddend.are .[.being.]. stored in the .[.first.]. .Iadd.the .[.first.]. .Iadd.second .Iaddend.and third register means .[.when.]. .Iadd.after .Iaddend.speech signals .Iadd.of the first channel in the next group of three channels .Iaddend.are .[.being.]. stored in the .[.second.]. .Iadd.first .Iaddend.register means;

    means for combining the speech signals from each selected pair of register means; and

    means for applying the combined speech signals to .Iadd.consecutive channels of .Iaddend.the outgoing TDM highway.

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