Multiplex communications – Wide area network – Packet switching
Patent
1984-10-09
1986-07-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04Q 1104
Patent
active
046034170
ABSTRACT:
In order to realize a system in which three or more subscriber parties can hold a conference, and a PCM decoder is also provided with a circuit which adds part of a received digital PCM signal on the input side of the PCM decoder to a PCM signal corresponding to the output of the PCM coder.
REFERENCES:
patent: 4276639 (1981-06-01), Fukuda et al.
patent: 4479212 (1984-10-01), Albanese
patent: 4535445 (1985-08-01), Lane et al.
patent: 4541087 (1985-09-01), Comstock
Shirasu Hirotoshi
Yamakido Kazuo
Hitachi , Ltd.
Olms Douglas W.
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