Systems and methods for providing echo control

H - Electricity – 04 – B

Patent

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Details

H04B 3/20 (2006.01) H04B 3/23 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2470097

A system for providing echo control for voice calls transmitted over circuit switched and packet switched networks uses stand-alone echo cancellers. A first echo canceller (310) is coupled to a first switch (130) in the circuit switched network and a first gateway (150) on the packet switched network. The first gateway forwards a first voice call over the packet switched network(170) to a second gateway (160) . The second gateway forwards the first voice call to a second switch (140) on the circuit switched network. A second echo canceller (320) is coupled to the second gateway and the second switch. The second echo canceller cancels echo associated with the first voice call when time associated with transmitting a first voice signal is greater than or equal to predetermined threshold.

L'invention concerne un système destiné à fournir une protection contre les échos pour des appels vocaux transmis sur des réseaux à commutation de circuits et à commutation par paquets, ce système utilisant des annuleurs d'écho autonomes. Un premier annuleur d'écho (310) est couplé à un premier commutateur (130) dans le réseau à commutation de circuits et à une première passerelle (150) sur le réseau à commutation par paquets. La première passerelle transfère un premier appel vocal vers une seconde passerelle (160) sur le réseau à commutation par paquets (170). La seconde passerelle transfère le premier appel vocal vers un second commutateur (140) dans le réseau à commutation de circuits. Un second annuleur d'écho (320) est couplé à la seconde passerelle et au second commutateur. Le second annuleur d'écho annule l'écho associé au premier appel vocal lorsque le temps associé à la transmission d'un premier signal vocal est supérieur ou égal à un seuil prédéterminé.

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