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High quality audio transform coding at 64 kbit/s

Codage par transformation à 64 kbit/s pour les signaux audio de haute qualité

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Abstract

This paper presents a transform coding algorithm designed for audio coding at a bit rate of 64 kbit/s. It enables the transmission of a high quality stereo sound through the 2B channels of isdn. Although a complete system including framing, synchronization and error correction has been developed, only the bit rate compression algorithm is described here. A detailed analysis of the signal processing techniques such as the time/frequency transformation, the preecho reduction by adaptive filtering, the fast algorithm computations…, is provided. The use of psychoacoustical properties is also precisely reported. Finally, some subjective evaluation results and one real time implementation of the coder using the att dsp52c digital signal processor are presented.

Résumé

Cet article présente un algorithme de codage par transformation pour la transmission de signaux sonores de haute qualité à 64 kbit/s. Il permet le transport d’un son stéréo de haute qualité au travers de l’accès de base du rnis. Quoiqu’un système de codage complet incluant la synchronisation, la protection contre les erreurs…, ait été développé, seul l’algorithme de compression de débit est décrit ici. Une analyse détaillée des techniques de traitement du signal employées : transformation temps/fréquence, réduction des prééchos par filtrage adaptatif, algorithmes rapides,… est fournie. La prise en compte des propriétés psychoacoustiques dans l’algorithme de codage est également décrite en détail. Enfin, les performances de ce codeur en termes de qualité subjective sont évoquées ainsi que son implantation sur processeur de signal.

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  1. Au CNET-LAA-TSS, BP 40, F-22301, Lannion, France

    Yannick Mahieux

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  1. Yannick Mahieux
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Mahieux, Y. High quality audio transform coding at 64 kbit/s. Ann. Télécommun. 47, 95–106 (1992). https://doi.org/10.1007/BF02999682

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  • DOI: https://doi.org/10.1007/BF02999682

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