|4-Wire Echo Suppression Conference Calls (WU Tech Review)|
18 Aug 2005 09:41:09 -0700
The Western Union Technical Review had an article describing how they|
utilized four-wire connections for voice conference calls to suppress
echos. A notable feature was that the four wires apparently went all
the way to the subscriber set. Another features was that conference
calls were set up automatically by dialing various codes. They used
an Ericsson crossbar switch on the WU voice network. Fall 1968.
The article goes into considerable technical detail.
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