Non-constant echo return loss for telephone terminal with...

Details Non-constant echo return loss for telephone terminal with... Non-constant echo return loss for telephone terminal with...

H - Electricity

04

M

H04M 1/60 (2006.01) H04M 1/20 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2207461

A telephone terminal having handsfree functionality is provided with an audio system which controls echo return loss while permitting virtual full-duplex operation. The system, which has a variolosser in both the transmit and receive path and an acoustic echo canceller, also has a complementary variolosser which introduces additional echo return loss only when required and as a function of the state of the system.

Un poste téléphonique à fonctions mains libres est doté d'un système audio qui commande l'affaiblissement d'équilibrage pour l'écho tout en permettant l'exploitation en duplex total virtuel. Le système, qui comporte un dispositif à pertes variables sur les trajets d'émission et de réception ainsi qu'un annulateur d'échos acoustiques, est également pourvu d'un dispositif à pertes variables complémentaire, qui produit un affaiblissement supplémentaire d'équilibrage pour l'écho, seulement selon les besoins et en fonction de l'état du système.

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