# A new quantization optimization algorithm for the MPEG advanced audio coder using a statistical sub-band model of the quantization noise

Abstract : In this paper, an improvement of the quantization optimization algorithm for the MPEG Advanced Audio Coder (AAC) is presented. This algorithm, given a bit-rate constraint, minimizes the perceived distortion generated by the signal compression. The distortion can be related to the quantization error level over frequency sub-bands through an auditory model. Thus, optimizing the quantification requires knowledge of the rate-distortion function for each sub-band. When this function can be modeled in a simple way, the algorithm can take a one-loop recursive structure. However, in the MPEG AAC, the rate-distortion function is hard to characterize, since AAC makes use of non-linear quantizers and variable length entropy coders. As a result, the standard algorithm makes use of two nested loops with a local decoder, in order to measure the error level rather than predicting its value. We first describe a partial sub-band modeling of the rate-distortion function of interest in the MPEG AAC. Then, using a statistical approach, we find a relationship between the error level and the so-called quantization scale-factor'' and propose a new algorithm that is basically similar to a classical one loop bit allocation'' process. Finally, we describe the complete algorithm and show that it is more efficient than the standard one.
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Article dans une revue
IEEE Transactions on Audio, Speech and Language Processing, Institute of Electrical and Electronics Engineers, 2006, 14 (4), pp.1328-1339. 〈10.1109/TSA.2005.858041〉
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https://hal.archives-ouvertes.fr/hal-00467469
Contributeur : Olivier Derrien <>
Soumis le : vendredi 26 mars 2010 - 15:52:51
Dernière modification le : jeudi 12 avril 2018 - 10:56:02
Document(s) archivé(s) le : lundi 28 juin 2010 - 16:48:27

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Derrien_SLAP06.pdf
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Olivier Derrien, Pierre Duhamel, Maurice Charbit, Gaël Richard. A new quantization optimization algorithm for the MPEG advanced audio coder using a statistical sub-band model of the quantization noise. IEEE Transactions on Audio, Speech and Language Processing, Institute of Electrical and Electronics Engineers, 2006, 14 (4), pp.1328-1339. 〈10.1109/TSA.2005.858041〉. 〈hal-00467469〉

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