1981-11-20
1984-01-10
Rubinson, G. Z.
H04M 356
Patent
active
044254784
ABSTRACT:
A conference system for establishing simultaneous interchange of information among a plurality of participants (E.sub.o -E.sub.k) comprises a conference network (CN). Each participant is connected to a terminal (n.sub.o -n.sub.k) which is connected to a hybrid network (CS.sub.o -CS.sub.k). The output (SW.sub.o -SW.sub.k) from the hybrid networks (CS.sub.o -CS.sub.k) are fed to summing amplifiers (SA.sub.o -SA.sub.k) in the conference network CN. The outputs of the summing amplifiers are fed to the participants via the hybrid networks (CS.sub.o -CS.sub.k).
The summing amplifiers (SA.sub.o -SA.sub.k) are arranged so that the signals contributed by the participant to which the particular summing amplifier output is connected is multiplied by a factor .beta. while the signals contributed by the other participants are multiplied by a factor .alpha..
By returning a portion of the signal generated by a participant to that participant it is possible to construct a system having a lower attenuation while maintaining stability.
REFERENCES:
patent: 4139731 (1979-02-01), Hashemi
patent: 4268716 (1981-05-01), Groves
patent: 4289932 (1981-09-01), Reed
patent: 4360910 (1982-11-01), Segal
van den Enden Adrianus W. M.
van Harreveld Teunis A.
Van Mil Job F. P.
Briody Thomas A.
Rubinson G. Z.
Schroeder L. C.
Streeter William J.
U.S. Philips Corporation
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