Multiplex communications – Communication over free space – Combining or distributing information via time channels
Patent
1995-09-18
1998-04-07
Hsu, Alpus H.
Multiplex communications
Communication over free space
Combining or distributing information via time channels
370410, 370435, 370477, 370522, 379283, 395 275, 455563, H04J 312, H04M 342
Patent
active
057373310
ABSTRACT:
A digital telecommunication network (10) provides an audio processor (56) for each call in each external node (14). The audio processor (56) includes a vocoder and additional functions. At a source external node (14), the audio processor (56) detects DTMF events and encodes the events in a call-related signalling packet (26) which conveys a history of all DTMF activity at the source node over the past several seconds. In addition, the source node detects silence and configures a call-related signalling packet (26) to instruct a destination node (14) how to synthesize comfort noise. Speech is encoded as vocoded voice packets rather than call-related signalling packets. At a destination external node, the node's audio processor (56) distinguishes call-related signalling from vocoded voice. The audio processor (56) synthesizes voice, comfort noise, DTMF signals, and other signals in response to the call-related signalling packets and vocoded voice packets.
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Armbruster Peter Joseph
Bishop, Jr. James William
Hoppal Thomas Jake
Wild Johanna
Gorrie Gregory J.
Hsu Alpus H.
Motorola Inc.
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