Digital signal processor-based telephone test set

Details Digital signal processor-based telephone test set Digital signal processor-based telephone test set

H - Electricity

04

M

H04M 3/26 (2006.01) H04M 1/24 (2006.01) H04M 3/22 (2006.01) H04M 3/24 (2006.01) H04M 3/30 (2006.01) H04M 3/493 (2006.01) H04M 3/537 (2006.01) H04Q 3/72 (2006.01)

Patent

CA 2241163

A digital signal processor-based test set programmed to enable a craftsperson tomonitor, and process signals of a variety of formats that are present on a line under test, including user feature analog modem type signals. Such signals may include caller-identification signals, visual message waiting indicator signals, and analog display services interface signals. Through embedded mirrored echo cancellation routines, the test set's supervisory DSP is able to provide what is effectively 'hands-free', full-duplex, dual direction acoustic speakerphone functionality, that allows the field technician to talk, while simultaneously listening to an acoustic output being generated by the test set's receiver.

L'invention est un appareil de vérification doté d'un processeur à signaux numériques qui est programmé pour permettre à un artisan de surveiller et de traiter des signaux de formats divers présents sur une ligne en cours de vérification, y compris des signaux de modem analogique pour fonctions d'utilisateur. Ces signaux peuvent comprendre des signaux d'identification d'utilisateurs, des signaux d'indication visuelle de messages en attente et des signaux analogiques d'interface pour services d'affichage. Au moyen de sous-programmes d'élimination d'échos doubles intégrés, le processeur de surveillance de l'appareil de vérification permet d'obtenir un téléphone à haut-parleur duplex «mains libres» qui permet au technicien de parler tout en écoutant l'émission acoustique produite par le récepteur de l'appareil de vérification.

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