Voice band-based data transmission system

Details Voice band-based data transmission system Voice band-based data transmission system

H - Electricity

04

Q

H04Q 7/24 (2006.01) H04M 11/06 (2006.01) H04Q 7/22 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2212957

A radiotelephone system provides a voice channel for carrying voice signals between a mobile unit and a called or calling unit. A first modem in the mobile unit and a second modem connected to a point along the voice channel employ a "blank-and-burst" method of communication to provide a data channel between a first data device connected to the mobile unit and a second data device connected to the second modem. The data channel enables the data devices to communicate with each otherseemingly concurrently, and with minimal interference, with the voice signals that are being carried over the voice channel and without requiring modifications to any base station.

Système radiotéléphonique doté d'une voie téléphonique pour l'acheminement de signaux vocaux entre une unité mobile et une unité appelée ou appelante. Un premier modem dans l'unité mobile et un deuxième modem connecté à un point de la voie téléphonique emploient une méthode de transmission « neutralisation-salve » afin d'assurer une voie de données entre un premier dispositif de données connecté à l'unité mobile et un deuxième dispositif de données connecté au deuxième modem. La voie de données permet aux dispositifs de données de communiquer entre eux en apparence simultanément en réduisant au minimum le brouillage des signaux vocaux acheminés sur la voie téléphonique et sans exiger de modifications d'aucune station de base.

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