Method of and arrangement for establishing a conference...

Details Method of and arrangement for establishing a conference... Method of and arrangement for establishing a conference...

H - Electricity

04

M

344/14

H04M 3/56 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1211823

PHN 10 294 12 ABSTRACT: To establish a conference connection between three participants in a TDM telephony system, use is made of the time-diivision switching stage which in many cases is already of a duplicated construction. The information signals (a, b, c) from the participants are written into corresponding addresses (AA, BB, CC) of two information memories while these addresses, after having been cyclic- ally permuted, are written into the address memory associ- ated with each of the information memories. When now the locations in the information memories are read in the sequence indicated by the address memories and summed thereafter, then each participant in the conference is supplied with a conference signal which is equal to the sum of the information signals of the two other participants in the conference connection.

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