Audio routing within trunked radio frequency multisite switch

Details Audio routing within trunked radio frequency multisite switch Audio routing within trunked radio frequency multisite switch

1991-02-22

1995-01-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 953, H04J 302

Patent

active

053847768

ABSTRACT:
A distributed trunked radio frequency (RF) switching network (switch) distributes audio routing control and processing throughout the switch, thus avoiding a centralized mixing matrix, increasing fault tolerance and providing low routing request latency time. Each audio source (e.g., RF repeater transmitter, dispatch console microphone) is preassigned an audio channel on a time division multiplexed (TDM) digitized audio network or bus. The audio sources continually broadcast digitized audio signals to all other nodes over the TDM network. Audio routing is performed at the audio destinations (e.g., nodes associated with RF repeater receivers, dispatch console speakers) by selectively "listening" to active TDM network channels. In the preferred embodiment, audio is routed unidirectionally on an "as needed" basis (e.g., in response to radio transceiver "keys" and "unkeys"), and audio routing pathways may change dynamically during an on-going call.

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