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HHT-based audio coding

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Abstract

In this paper, a new audio coding scheme combining the Hilbert transform and the empirical mode decomposition (EMD) is introduced. Based on the EMD, the coding is fully a data-driven approach. Audio signal is first decomposed adaptively, by EMD, into intrinsic oscillatory components called intrinsic mode functions (IMFs). The key idea of this work is to code both instantaneous amplitude (IA) and instantaneous frequency (IF), of the extracted IMFs, calculated using Hilbert transform. Since IA (resp. IF) is strongly correlated, it is encoded via a linear prediction technique. The decoder recovers the original signal by superposition of the demodulated IMFs. The proposed approach is applied to audio signals, and the results are compared to those obtained by advanced audio coding (AAC) and MP3 codecs, and wavelets-based compression. Coding performances are evaluated using the bit rate, objective difference grade (ODG) and noise to mask ratio (NMR) measures. Based on the analyzed audio signals, overall, our coding scheme performs better than wavelet compression, AAC and MP3 codecs. Results also show that this new scheme has good coding performances without significant perceptual distortion, resulting in an ODG in range \([-1,0]\) and large negative NMR values.

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Acknowledgments

The authors are grateful to the anonymous reviewer for supplying useful comments and pointing out the proof-of-concept nature of the paper.

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Authors and Affiliations

  1. IRENav, Ecole Navale, BCRM Brest, CC 600, 29240 , Brest Cedex 9, France

    Kais Khaldi & Abdel-Ouahab Boudraa

  2. U2S, ENIT, BP 37, Le Belvédère 1002, Tunis, Tunisia

    Kais Khaldi

  3. LATP, CMI, Université de Provence, 39 rue F. Joliot-Curie, 13453 , Marseille Cedex 13, France

    Bruno Torresani

  4. LabSTICC UMR, Télécom Bretagne, BP 832, 29238 , Brest Cedex 3, France

    Thierry Chonavel

Authors
  1. Kais Khaldi
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  2. Abdel-Ouahab Boudraa
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  3. Bruno Torresani
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  4. Thierry Chonavel
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Corresponding author

Correspondence to Abdel-Ouahab Boudraa.

Additional information

Preliminary results of this work has been presented at IEEE ISCCSP conference, Limassol, Cyprus, 2010.

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Khaldi, K., Boudraa, AO., Torresani, B. et al. HHT-based audio coding. SIViP 9, 107–115 (2015). https://doi.org/10.1007/s11760-013-0433-6

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  • DOI: https://doi.org/10.1007/s11760-013-0433-6

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