Method and system for operating audio encoders in parallel

Details Method and system for operating audio encoders in parallel Method and system for operating audio encoders in parallel

G - Physics

10

L

G10L 19/02 (2006.01)

Patent

CA 2605423

The time needed to encode an input audio stream is reduced by dividing the stream into two or more overlapping segments of audio information blocks, applying an encoding process to each segment to generate encoded segments in parallel, and appending the encoded segments to form an encoded output signal. The encoding process is responsive to one or more control parameters. Some of the control parameters, which apply to a given block, are calculated from audio information in one or more previous blocks. The length of the overlap between adjacent segments is chosen such that the differences between control parameter values and corresponding reference values at the end of the overlap interval are small enough to avoid producing audible artifacts in a signal that is obtained by decoding the encoded output signal.

Selon l'invention, le temps nécessaire pour encoder un flux audio d'entrée est réduit : par division de ce flux en deux segments chevauchants de blocs d'informations audio, ou davantage ; par application d'un processus d'encodage à chaque segment, pour générer des segments encodés en parallèle, et ; par ajout des segments encodés les uns aux autres, pour former un signal de sortie encodé. Le processus d'encodage est sensible à un ou plusieurs paramètres de commande. Certains de ces paramètres de commande, qui concernent un bloc donné, sont calculés à partir d'informations audio contenues dans un ou plusieurs blocs précédents. La longueur du chevauchement entre des segments adjacents est sélectionnée de manière que la différence entre les valeurs de paramètres de commande et des valeurs de référence correspondantes à la fin de l'intervalle de chevauchement soit suffisamment petite pour empêcher la production d'artefacts audibles dans un signal obtenu par décodage du signal de sortie encodé.

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