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A Scalable Three Bit-rates 8–14.1-24 kbit/s Audio Coder

Codeur Audio Hiérarchique (8–14,1 — 24 kbit/s)

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Abstract

This paper presents a scalable three bit- rates (8, 14.1 and 24 kbit/s) coder. For the two embedded lowest ones, operating in the telephone bandwidth, celp coding techniques are used. For the highest rate, that both improves narrowband quality and extends the band to [50-7000Hz], transform coding techniques are used. The main applications deal with transmission over network with no guaranteed QoS.

Résumé

Cet article présente un codeur hiérarchique à trois débits (8, 14,1 et 24 kbit/s). Pour les deux plus bas débits imbriqués, fonctionnant en bande téléphonique, des techniques celp sont utilisées. Le plus haut débit, qui améliore la qualité en bande téléphonique tout en étendant la bande passante à la gamme [50, 7 000 Hz], utilise un codage par transformée. Les principales applications de ce codeur se situent dans le domaine de la transmission sur réseau à qualité de service non garantie.

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Author information

Correspondence to Hervé Taddei or Dominique Massaloux or Alain Le Guyader.

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Taddei, H., Massaloux, D. & Le Guyader, A. A Scalable Three Bit-rates 8–14.1-24 kbit/s Audio Coder. Ann. Télécommun. 55, 483–492 (2000). https://doi.org/10.1007/BF02995203

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Key words

  • Speech coding
  • Sound coding
  • Coder
  • Decoder
  • Scalability
  • Hierarchical coding
  • Passband compression
  • Sound Quality

Mots clés

  • Codage parole
  • Codage son
  • Codeur
  • Décodeur
  • Hiérarchie
  • Codage hiérarchique
  • Compression bande passante
  • Qualité sonore