Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1997-01-31
2000-04-25
Le, N.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379406, 370286, H04M 100
Patent
active
060553111
ABSTRACT:
An echo canceller pool configuration is provided that allows a user to predetermine and individualize the echo cancellation parameter settings for any echo canceller in the pool, based on prior knowledge of the echo path characteristics of the specific transmission route to be used for an ensuing call. The echo canceller with the individualized parameter settings is then switched into that route for the duration of the call. For example, at call setup, once a trunk route has been identified that will be used to complete the call, a "flag" is retrieved that is associated with that specific route. That "flag" identifies specific echo canceller parameter settings to be used for that route. Those parameter settings are downloaded to the echo canceller device selected from the pool, and that device is then switched into the specific trunk involved. An operator can thereby optimize echo cancellation in the system and significantly improve speech quality overall.
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Dreyfert Torkel
Ortolanis Petros
Hsieh Shin-Wen
Le N.
Telefonaktiebolaget L M Ericsson (publ)
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