Abstract: Digital conference bridge for use with a plurality of telephones (#1 . . . #n) and arranged whereby in accordance with predetermined output conditions from the telephones, as existing from time to time during use of the telephones for communication therebetween, the output signal from one telephone is directed to the remainder of the telephones and the output signals of the remainder are suppressed. The bridge generates products x.sub.n .multidot.g.sub.n and x.sub.i .multidot.g.sub.i where x.sub.n and x.sub.i are instantaneous magnitudes of samples of all of the signals and of the selected signal respectively, and g.sub.n and g.sub.i are predetermined gain factors for all of the signals and for the selected signal respectively. A register (60) storing the value of "i", designating the presently selected telephone, is updated by a circuit including comparators (42,52) connected to a gate (44) whereby to surplant a selection of an existing value of "i" by a new value under the following conditions:x.sub.n .