Codec mode decoding using a priori knowledge

H - Electricity – 04 – L

Patent

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H04L 1/12 (2006.01) H04B 1/06 (2006.01) H04J 3/00 (2006.01) H04L 1/00 (2006.01) H04L 1/14 (2006.01) H04L 27/22 (2006.01)

Patent

CA 2341879

A communication system supports multiple source coding/channel coding schemes. A mode indicator can be transmitted with payload data to inform the receiver of the particular scheme currently being employed. The mode indicator may be encoded using a relatively weak channel coding to minimize extraneous overhead transmissions. To enhance the likelihood of successfully decoding the mode indicator, which has information that is highly important in successfully decoding the payload data, various value likelihood parameters can be calculated and combined to identify a most likely mode. Included in the likelihood (soft) parameters is one parameter which can be calculated based on a model of the mode information's likely value (e.g. Markov model).

L'invention concerne un système de communication admettant plusieurs logiques codage source/codage canal. Les données payantes émises peuvent être accompagnées d'un indicateur de mode permettant au récepteur de connaître la logique en cours d'utilisation. Le codage de l'indicateur de mode peut se faire au moyen d'un codage canal relativement faible, ce qui permet de minimiser les émissions de signaux non payants. Pour renforcer la probabilité de réussite de décodage de l'indicateur de mode, qui détient des informations de la plus haute importance pour la réussite du décodage des données payantes, on peut calculer et combiner différents paramètres de vraisemblance (douce) de valeurs permettant d'identifier le mode le plus probable. Parmi ces paramètres de vraisemblance figure un paramètre que l'on peut calculer à partir du modèle de Markov appliqué à la valeur probable du modèle des informations de mode.

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