A modem with received signals and transmitted signals...

H - Electricity – 04 – B

Patent

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Details

H04B 1/40 (2006.01) H04L 25/49 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2125718

An approach for operating modems in synchronism with the A/D and D/A converters of the network limits the analog signals transmitted to the modem to low levels and concurrently restricts the received signals to large steps. This set of apparently conflicting signal limitations is achieved with a signal conversion process interposed in the communication path between the two hybrids. In one embodiment of this invention, the code conversion is implemented in an adjunct processor that is associated with a switch that participates in the communication path between the two modems. In operation, a call that needs the conversion process is identified by virtue of the calling party's number and service associated service provision information. When it is established that both the calling party's modem and the receiving party's modem operate in the manner that requires signal conversion, conversion is executed. Echo cancellation may be applied to the signal in the code conversion apparatus to further improve performance.

L'invention est une méthode d'utilisation de modems en synchronisme dans laquelle les convertisseurs analogiques-numériques et numériques-analogiques du réseau maintiennent les signaux analogiques transmis aux modems à des niveaux faibles tout en imposant de grandes variations brusques aux signaux reçus. Ces contraintes en apparence incompatibles imposées aux signaux peuvent être réalisées au moyen d'un processus de conversion de signaux interposé dans le trajet de communication entre les deux éléments hybrides. Dans l'une des concrétisations de l'invention, la conversion de codes est réalisée dans un processeur associé à un commutateur en service dans le trajet de communication entre les deux modems. Dans la méthode de fonctionnement de l'invention, un appel nécessitant cette conversion est identifié par le numéro de l'abonné demandeur et par une information sur le service offert. Quand il est établi que le modem de l'abonné demandeur et celui de l'abonné de destination fonctionnent d'une façon qui nécessite une conversion du signal, cette conversion est exécutée. On peut améliorer la performance du convertisseur de codes en lui incorporant un éliminateur d'échos.

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