Encoding audio signals

G - Physics – 10 – L

Patent

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G10L 19/14 (2006.01)

Patent

CA 2429735

A system for transmitting audio signals over a telecommunications link generates the signals as two or more alternative feeds, for example at different data rates. The two feeds are encoded using coding methods having a frame structure with different frame lengths. To facilitate switching between the two, the input signal is notionally divided into temporal portions and each is coded by taking it, plus enough of the next (or preceding) portion to make up a whole number of frames, and encoding it, whereby the encoded portions overlap-at least for one of the feeds. The overlap is lost upon decoding by discarding duplicate material.

L'invention concerne un système pour transmettre des signaux audio dans une liaison de télécommunication, lequel système génère les signaux en tant qu'au moins deux sources alternatives, par exemple à des débits de transmission de données différents. Ces deux sources sont codées à l'aide de procédés de codage possédant une structure de trame avec différentes longueurs de trame. Afin de faciliter la commutation entre les deux sources, le signal d'entrée est divisé théoriquement en parties temporelles et chaque partie est codée de la façon suivante: on prend ladite partie, plus une portion suffisante de la partie suivante (ou précédente) pour former un nombre complet de trames, et on la code, les parties codées se chevauchant, du moins pour l'une des sources. Le chevauchement est perdu au décodage par élimination du matériau double.

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