Digitally controlled intercommunications system

摘要

An intercommunications system for the selective establishment of two-way communications between a multiplicity of stations is disclosed and comprises a terminal located at each station and a communications network including a predetermined number of lines for interconnecting any one of the terminals to at least one other of the terminals. Each terminal comprises an audio subsystem, apparatus for generating digitally coded control words for selecting a particular terminal and for selecting a particular unused line to be used in the two way communications, apparatus for transmitting the control words over a selected line to all the terminals, apparatus for receiving the digitally coded control words, decoding the control words and operatively connecting the desired terminals to the selected line, a monitor enable device for listening to the communications on a particular line without being part of the communications and display devices which show which lines and which terminals in the intercommunications system are in use.