Multiplex communications – Wide area network – Packet switching
Patent
1994-10-11
1996-01-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 851, 379167, 381119, H04J 302, H04M 902, H04M 908
Patent
active
054835283
ABSTRACT:
A time division multiplexing ("TDM") digital matrix intercom system for connecting intercom stations. The system includes a digital switching system receiving audio input communications signals from at least some of the intercom stations, and sending audio input communications signals to at least some of the intercom stations. The digital switching system includes a TDM system for broadcasting on a TDM bus multiple digital communications signals including such digital audio input signals. The TDM system includes one or more interfaces connecting intercom stations with the TDM bus. The system also includes a signal mixer which is capable of receiving from the TDM bus selected ones of the digital audio input signals, and creating and broadcasting on the TDM bus a custom mixed digital audio output communications signal which is a loudness weighted mix of such selected digital audio input signals with at least one of such selected signals optionally being given a larger weight corresponding to a louder volume than others of the selected signals. A custom mixed digital audio output signal thus may be routed to a selected one of the intercom stations as an audio output communications signal. Preferably the system includes an integrated circuit for producing custom output mix signals.
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Jung Min
Kaihoi Gregory P.
Olms Douglas W.
Telex Communications, Inc.
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