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A method of making conference call connections in computer-controlled telephone exchanges 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. A bit stream of the conference participants reaching a conference assembly through an incoming line is distributed to m adding processors having n channels each, and the PCM words are linearized with a code table and stored in level memories for each particular participant. A total of the linear values is formed, is added to individual participant evaluation totals and is stored in evaluation memories for each particular participant. The participant evaluation totals are transmitted to an evaluation processor which determines active channels by using a delayed mean value of the participant levels and transmits it to the adding processors. A conference total signal is created by adding linear values of all channels. Transmission signals for all channels are formed in the adding processors by compressing the conference total signal, the individual linear value of the active participants being substracted before compression. The signals thus created are stored in transmitting memories and transmitted through an outgoing line.

The renormalization transformation for two-type branching models