Conference circuit for PCM system

Details Conference circuit for PCM system Conference circuit for PCM system

1981-01-14

1983-06-14

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

179 18BC, H04Q 1104

Patent

active

043887171

ABSTRACT:
A conference circuit capable of controlling a plurality of conferences in PCM format. In this system, a person calling a party busy in a two party conversation and wishing to notify the called party of the call initiates camp-on service. The call is transferred to conference channels. The conference circuit performs a comparison between the loudness of the speech sample from each party in a conference to transmit the loudest sample for a second comparison. The second comparison is made against signals generated for providing camp-on tone to existing calls. The loudest sample output indicated by the second comparison is transmitted to the stations of the conference other than the one having generated the loudest signal.

REFERENCES:
patent: 3699264 (1972-10-01), Pitroda et al.
patent: 4007338 (1977-02-01), McLaughlin
patent: 4022981 (1977-05-01), McLaughlin et al.
patent: 4022991 (1977-05-01), Kelly et al.
patent: 4224688 (1980-09-01), Ciancibello et al.

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