Electronic exchange having a conference telephone...

Details Electronic exchange having a conference telephone... Electronic exchange having a conference telephone...

H - Electricity

04

M

344/14, 379/46

H04M 3/56 (2006.01)

Patent

CA 1335307

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 telephonic communication path are added, the telephone communication signal on any particular speaker himself 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.

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