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Method of making conference call connections in computer-controlled digital telephone exchanges

  • US 4,809,262 A
  • Filed: 02/22/1988
  • Issued: 02/28/1989
  • Est. Priority Date: 02/23/1987
  • Status: Expired due to Fees
First Claim
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1. In a method of making conference call connections in computer-controlled telephone exchanges, which includes combining voice signals of conference participants on a digital basis, forming a signal of a total of speaking levels of a given number of the most active participants, distributing the signal in an undamped manner, and suppressing voice signals of the inactive participants, the improvement which comprises:

  • distributing a bit stream of the conference participants reaching a conference assembly through an incoming line to m adding processors having n channels each, linearizing PCM words by means of a code table, storing the PCM words in level memories for each particular participant;

    forming a total of the linear values, adding the total of the linear values to individual participant evaluation totals, and storing the total of the linear values in evaluation memories for each particular participant;

    transmitting the participant evaluation totals to an evaluation processor which determines active channels by using a delayed average value of the participant levels and which transmits the active channels to the adding processors;

    creating a conference total signal by adding linear values of all channels;

    subtracting the individual linear value of the active participants, subsequently forming transmission signals for all channels in the adding processors by compressing the conference total signal;

    storing the signals thus created in transmitting memories, and transmitting the signals through an outgoing line.

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