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

H - Electricity

04

B

H04B 7/155 (2006.01) H04J 3/02 (2006.01) H04Q 7/28 (2006.01)

Patent

CA 2050014

A distributed trunked radio freequency (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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