Supporting a switch between audio coder modes

G - Physics – 10 – L

Patent

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Details

G10L 19/14 (2006.01)

Patent

CA 2566489

The invention relates to a method for supporting an encoding of an audio signal, wherein a first coder mode and a second coder mode are available for encoding a respective section of an audio signal. The second coder mode enables a coding of a respective section based on a first coding model, which requires for an encoding of a respective section only information from the section itself, and based on a second coding model, which requires for an encoding of a respective section in addition an overlap signal with information from a preceding section. After a switch from the first coder mode to the second coder mode, always the first coding model is used for encoding a first section of the audio signal. This section can then be employed to generate an artificial overlap signal for a subsequent section, which is possibly to be encoded with the second coding model.

L'invention concerne un procédé de support du codage d'un signal audio, un premier mode de codage et un second mode de codage étant disponibles pour coder une section correspondante d'un signal audio. Le second mode de codage permet le codage d'une section correspondante à partir d'un premier modèle de codage, nécessitant pour le codage d'une section correspondante seulement des informations de la section elle-même, et à partir d'un second modèle de codage, nécessitant pour le codage d'une section correspondante un signal de chevauchement avec les informations de la section précédente. Après la commutation du premier mode de codage vers le second mode de codage, le premier modèle de codage est toujours utilisé pour coder une première section du signal audio. Cette section peut alors être utilisée pour générer un signal de chevauchement artificiel pour une section ultérieure, destinée selon toute probabilité à être codée avec le second modèle de codage.

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