H - Electricity – 04 – M
Patent
H - Electricity
04
M
344/14
H04M 3/56 (2006.01)
Patent
CA 1232663
INSTANT SPEAKER ALGORITHM FOR DIGITAL CONFERENCE BRIDGE 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 tele- phones and the output signals of the remainder are suppressed. The bridge generates products xn.gn and xi.gi where xn and xi are instantaneous magnitudes of samples of all of the signals and of the selected signal respectively, and gn and gi are predetermined gain factors for all of the signals and for the selected signal respect- ively. A register storing the value of "i", designating the presently selected telephone, is updated by a circuit including comparators connected to a gate whereby to surplant a selection of an existing value of "i" by anew value under the following conditions:- xn.gn > xi.gi; and xn.gn > T.gn. One of the comparators is arranyed to compare the last held values xi.gi as stored in a register with the incoming products xn.gn, to determine whether the first of these conditions prevails and the second com- parator is arranged to compare the incoming product xn.gn with the product T.gn to determine whethcr the second of these conditions prevails. The value "T" represents a threshold value stored in the threshold register. The bridge is arranged to replace a threshold "T" as stored in the threshold register by a new value equal to xi.gi in the event that a product xi.gi should exceed the existing value of "T". The bridge is also arranged to decrement the threshold value "T" by a pre- determined amount in the event that the threshold value "T" should exceed one or a plurality of successive products xi.gi.
490497
Australian Telecommunications Commission
Oyen Wiggs Green & Mutala Llp
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