Superposition of data over voice

H - Electricity – 04 – M

Patent

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H04M 11/06 (2006.01)

Patent

CA 2345794

Method and apparatus for transmitting messages between communication devices via a communication channel allowing at least voice messages to be transmitted, the messages including data subdivided in a sequence of basic data units, the method including: a) encoding the basic data units as unique signals (usj) including a predetermined number of basic signals (bi), each basic signal having a unique fixed frequency (fi); b) transmitting a sequence of unique signals (usj) during a sequence of fixed time periods (t1, t2, t3, ...); c) receiving and decoding the sequence of unique signals (usj) into the sequence of basic data units; the data being transmitted in superposition over voice.

L'invention concerne un appareil mettant en oeuvre un procédé de transmission de messages entre des dispositifs de communication via un canal de communication permettant au moins la transmission de messages vocaux, lesdits messages comprenant des données subdivisées en une séquence d'unités de données de base. Ledit procédé consiste: a) à coder les unités de données de base sous forme de signaux uniques (us¿j?) comprenant un nombre prédéterminé de signaux de base (b¿i?), chaque signal de base ayant une fréquence fixe unique (f¿i?); b) à transmettre une séquence de signaux uniques (us¿j?) au cours d'une séquence d'intervalles de temps fixes (t1, t2, t3,...); c) à recevoir et à décoder la séquence de signaux uniques (us¿j?) dans la séquence d'unités de données de base; les données étant transmises en superposition sur la voix.

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