Abstract
In this paper, we propose a new summation method for MPEG-1 encoded audio signals in the compressed domain. This method operates directly in the subband domain in order to reduce the delay and the implementation complexity. The main problem to be solved deals with bit allocation and subsequent quantization of the resulting summation signal. The bit allocation of encoded mpeg signals is based on the signal-to-mask ratios of the individual signals. To estimate the signal-to-mask ratios of the combined signal, the algorithm simply needs the information contained in the individual encoded frames. Along with a description of the proposed algorithm, variations and applications of the algorithm are detailed. Additionally, a performance evaluation of this method compared to direct summation in the time domain is given.
Résumé
Cet article présente une nouvelle méthode de sommation des signaux audio codés mpeg-1 dans le domaine compressé. Elle se propose d’effectuer un traitement direct dans le domaine des sous-bandes dans le but de réduire le délai et la complexité algorithmique dus aux bancs de filtres. Le problème essentiel concernant cette approche est lié à l’allocation des bits pour le signal somme. Ainsi, l’algorithme propose d’utiliser seulement les informations contenues dans les trames individuelles pour estimer les rapports signal à masque du nouveau signal. D’autres variantes de l’algorithme sont aussi proposées. Une évaluation des performances par rapport à la sommation directe dans le domaine temporel est finalement donnée.
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Touimi, A.B., Mahieux, Y. & Lanciani, C.A. A summation algorithm for MPEG-1 coded audio signals: a first step towards audio processing in the compressed domain. Ann. Télécommun. 55, 108–116 (2000). https://doi.org/10.1007/BF03001904
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DOI: https://doi.org/10.1007/BF03001904