Conference system for telephony

Details Conference system for telephony Conference system for telephony

H - Electricity

04

M

344/14

H04M 3/56 (2006.01)

Patent

CA 1188779

13 ABSTRACT: A conference system comprises a conference cir- cuit to which a plurality of participants are connected via terminals (n1 to n4) and respective connecting cir- cuits. The connecting circuits comprise input and output circuits, the signal from the output circuits being fed via lines to the conference circuit and signals from the conference circuit being fed via lines to the input cir- cuits. The conference circuit comprises summing ampli- fiers whose inputs are connected to the outputs of the connecting circuits so that the output signals from the connecting circuits are algebraically summed with the signs determined from the S matrix shown below. Image The signs of the signals to be summed is determined from the relationship E - Sx S = 0 where E is the unity matrix and Sx is the transposed complex conjugate matrix of S.

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