Communication system using a compressed connection

H - Electricity – 04 – Q

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H04Q 3/62 (2006.01) H04J 3/18 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2316866

In a communication system comprising a number of networked PBX's often compression connections are used for interconnecting such PBX's. In a PBX (3), a plurality of source signals is compressed by a compression processor (32) and subsequently multiplexed by a multiplexer (34). The multiplexed signal is transmitted to a second PBX (5) where it is demultiplexed by a demultiplexer (36) and decompressed by a decompression processor (40). Due to the compression performed on the source signal, the quality of the reconstructed speech signal in the second PBX is somewhat deteriorated. In order to improve the quality of the reconstructed source signal, it is proposed to make the compression ratio dependent on the aggregate bitrate of the source signals to be transmitted over a particular transmission link.

Dans un système de communication comprenant plusieurs autocommutateurs privés en réseau, on utilise souvent des connexions comprimées pour interconnecter ces autocommutateurs. Dans un autocommutateur (3), plusieurs signaux de demandeur sont comprimés par un processeur de compression (32), puis multiplexés par un multiplexeur (34).e signal multiplexé est transmis à un deuxième autocommutateur (3) où il est démultiplexé par un démultiplexeur (36) et décomprimé par un processeur de décompression (40). En raison de la compression du signal de demandeur, la qualité du signal vocal reconstitué dans le deuxième autocommutateur est sensiblement dégradée. Afin d'améliorer la qualité du signal de demandeur reconstitué, on envisage de rendre le taux de compression dépendant du débit global des signaux de demandeur destinés à être transmis par une chaîne de transmission particulière.

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