Multiplex communications – Channel assignment techniques – Only active channels transmitted
Patent
1996-08-06
1999-02-09
Olms, Douglas W.
Multiplex communications
Channel assignment techniques
Only active channels transmitted
370528, H04T 317
Patent
active
058703977
ABSTRACT:
A method and an apparatus for removing the silence from the digitalized voice signals conveyed through packets or cells switching networks. The silence samples are neither packetized nor sent over the network but are regenerated at the output of the network. The silence samples generated are white noise samples, where the level is adapted to the background noise of the silence samples received at the input node of the network. For long periods of silence, the white noise level is periodically refreshed to be adapted to the last silence samples received at the input node of the network. The method provides also a control of packet or cell loss. The method uses are not control packets; in the later case, it can be used for ATM networks with AAL1. The method is implemented as a program executed in a Digital Signal Processor located on adapter cards dedicated to voice processing in the network access nodes.
REFERENCES:
patent: 4503533 (1985-03-01), Tobagi et al.
patent: 5220565 (1993-06-01), Wilson et al.
patent: 5526353 (1996-06-01), Henley et al.
patent: 5615214 (1997-03-01), Chandos et al.
patent: 5673268 (1997-09-01), Sharma et al.
Chauffour Pascal
Duault Maurice
Pucci Bernard
Richter Gerard
International Business Machines - Corporation
Olms Douglas W.
Rao Seema S.
Woods Gerald R.
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