Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1996-03-20
1997-03-11
Chin, Wellington
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
370260, 379159, H04J 326
Patent
active
056109202
ABSTRACT:
Radio and workstation nodes are operated together in a network which may be either a LAN or a WAN network. The audio is sampled from up to 16 voice sources (radios or intercoms) at a 125 micro second rate and converted into a 16-bit representation by the A-D converters associated with a digital signal processor (DSP) at the radio or voice node. The samples are then captured by the DSP and processed by the voice sampler. When the DSP voice detection software notices a signal which meets the voice detection criteria, a process is started which collects audio sample packets and continues to run as long as the voice detection criteria on a specific channel are met. These audio sample packets are assigned sequence tags and placed into a user datagram protocol (UDP) message addressed to the receiving DSP by the voice distribution process. The network protocols for UDP packets provide delivery to the correct DSP. At the receiving DSP the UDP messages are received and audio sample packets destined for playback at the specific DSP are buffered for an automatically determined delay period by the adaptive buffering algorithm of the voice mix/playout process. At the workstation nodes voice signals from a number of independent voice sources may be selected by the operator and mixed at operator selectable volume levels through the voice mix/playout process. The header information identifies which radio the packet is for and contains the identifier of the workstation node holding push-to-talk (PTT) control for the radio.
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Doll Michael J.
Kleven Donald J.
Pobiel Joseph
Bowen Glenn W.
Chin Wellington
Lockheed Martin Corporation
Vu Huy D.
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