Electronic exchange having a conference telephone communication

Details Electronic exchange having a conference telephone communication Electronic exchange having a conference telephone communication

1989-03-22

1991-04-09

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04M 356

Patent

active

050070495

ABSTRACT:
An improved (N - 1) adding operation conference telephone communication method through an electronic exchange in which the telephone communication signals on speakers in a time sharing multiplexed telephone communication path are added, the telephone communication signal on any particular speaker is subtracted and the resulting telephone communication signals are transferred to the remaining respective speakers. The levels of the telephone communication signals are monitored which are obtained as the result of the (N - 1) adding operation. When the telephone communication signals exceed a preset threshold level, they are selectively attenuated and transferred to the remaining respective speakers. The selective attenuation of the telephone communication signals which have exceeded the threshold level is released a predetermined time after conditions under which the threshold level is exceeded have disappeared to thereby prevent satisfactorily the deterioration of the voice quality which would otherwise be feared.

REFERENCES:
patent: Re31814 (1985-01-01), Lubin
patent: 3984643 (1976-10-01), Inrig et al.
patent: 4054757 (1977-10-01), LeJay
patent: 4276639 (1981-06-01), Fukuda et al.
patent: 4387457 (1983-06-01), Munter
patent: 4499578 (1985-02-01), Marouf et al.
patent: 4606021 (1986-08-01), Wurst
patent: 4635252 (1987-01-01), Kuchler

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