Method and apparatus for transmitting messages in a...

H - Electricity – 04 – M

Patent

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Details

H04M 11/06 (2006.01) H04J 3/16 (2006.01) H04J 3/17 (2006.01) H04L 1/00 (2006.01) H04M 1/725 (2006.01)

Patent

CA 2236348

The invention relates to a method and an apparatus for implementing the method, which allow a transmitter (100) of a digital telecommunication system transmitting speech to transmit predetermined messages to a receiver (102) over a speech channel (108). The invention is based on transmitting messages (114) from the transmitter (100) to the receiver (102) on the speech channel (108) in such a way that they are encoded in some of the speech coding bits,whereby the speech coding bits selected for message transmission have been selected in such a way that they affect the quality of speech as little as possible. Most preferably, the speech coding bits used for transmitting messages are protected by channel coding (702, 704). Speech coding bits are "stolen" for message transmission only for very short periods at a time and only for exactly the time it takes to transmit the messages (114); at other times, the entire speech channel (108) is used normally for speech transmission.

L'invention concerne un procédé et un appareil pour mettre en oeuvre ce procédé, permettant à un transmetteur (100) d'un système de télécommunication numérique de transmission vocale de transmettre des messages prédéterminés, vers un récepteur (102), par un canal vocal (108). L'invention est basée sur la transmission de messages (114) d'un transmetteur (100) vers un récepteur (102) sur le canal vocal (108) de manière à ce qu'ils soient codés dans certains des bits de langage. Les bits codant le langage choisis pour la transmission des messages l'ont été de manière à influer aussi peu que possible sur la qualité du language. De préférence, les bits de codage du langage utilisés pour transmettre des messages sont protégés par le codage des canaux (702, 704). Les bits de codage du langage sont "volés" pour la transmission de messages, uniquement pendant des périodes très courtes à la fois et uniquement pendant la durée exacte de temps nécessaire pour transmettre le message (114); à d'autres moments, le canal vocal entier (108) est utilisé normalement pour la transmission vocale.

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