Audio encoder, audio decoder and audio processor having a...

G - Physics – 10 – L

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G10L 19/00 (2006.01)

Patent

CA 2656423

An audio encoder, an audio decoder or an audio processor includes a filter (12) for generating a filtered audio signal, the filter having a variable warping characteristic, the characteristic being controllable in response to a time-varying control signal (16), the control signal indicating a small or no warping characteristic or a comparatively high warping characteristic. Furthermore, a controller (18) is connected for providing the time-varying control signal, which depends on the audio signal. The filtered audio signal can be introduced to an encoding processor (22) having different encoding algorithms, one of which is a coding algorithm adapted to a specific signal pattern. Alternatively, the filter is a post-filter receiving a decoded audio signal.

L'invention concerne un codeur audio, un décodeur audio ou un processeur audio comprenant un filtre (12) pour générer un signal audio filtré, le filtre ayant une caractéristique de gauchissement variable, la caractéristique étant réglable en réponse à un signal de régulation variable dans le temps (16), le signal de régulation indiquant une caractéristique de gauchissement faible ou absente ou une caractéristique de gauchissement comparativement élevée. En outre, un contrôleur (18) est connecté pour produire le signal de régulation variable dans le temps, qui dépend du signal audio. Le signal audio filtré peut être introduit sur un processeur de codage (22) ayant des algorithmes de codage différents, dont un est un algorithme de codage adapté à une forme de signal spécifique. En variante, le filtre est un post-filtre recevant un signal audio décodé.

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