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Chapitre de livre

  • B. Geiser, S. Ragot, and H. Taddei "Embedded Speech Coding: From G.711 to G.729.1," Chapitre 8 in Advances in Digital Speech Transmission (R. Martin, U. Heute, C. Antweiler, eds.), Wiley, Jan. 2008, pp. 201-248

Articles de journaux scientifiques

  1. S. Ragot, B. Kovesi, A. Le Guyader, "Noise Feedback Coding Revisited: Refurbished Legacy Codecs and New Coding Models (article invité)," ZTE Communications, Special issue on Emerging Technologies for Multimedia Coding, Analysis and Transmission, vol. 10, no. 2, pp. 37-47, Juin 2012
  2. B. Geiser, P. Jax, P. Vary, H. Taddei, S. Schandl, M. Gartner, C. Guillaumé, and S. Ragot, "Time Domain Bandwidth Extension for Hierarchical Speech and Audio Coding in ITU-T Rec. G.729.1," IEEE Transactions on Speech, Audio and Language Processing, vol. 15, no. 8, pp. 2496-2509, Nov. 2007
  3. S. Ragot, M. Xie, and R. Lefebvre, "Near-Ellipsoidal Voronoi Coding," IEEE Transactions on Information Theory, vol. 49, no. 3, pp. 1815-1820, Juillet 2003
  4. S. Ragot, J.-P. Adoul, and R. Lefebvre, "Hexacode-based quantization of the Gaussian source at 1/2 bit per sample," IEEE Transactions on Communications, vol. 49, no. 12, pp. 2056-2058, Déc. 2001

Articles de congrès

  1. R. Buguet, S. Ragot, T. Muller, "Amélioration de codecs de parole par modèle de diffusion," Proc. CORESA. Nov. 2024
  2. M. Multrus, S. Bruhn, J. Torres, E. Fotopoulou, T. Toftgård, E. Norvell, S. Döhla, Y. Gao, H.-Y. Su, L. Laaksonen, A. Vasilache, T. Moriya, S. Ragot, M. Emerit, H. Ehara, M. Szczerba, A. Genovese, A. Schevciw, V. Eksler, and V. Malenovsky, "Immersive Voice and Audio Services (IVAS) Codec – The New 3GPP Standard for Immersive Communication," Proc. AES 157th Convention, Oct. 2024
  3. T. Muller, S. Ragot, V. Barriac, P. Scalart, "Evaluation of Objective Quality Models on Neural Audio Codecs," Proc. IWAENC, Sept. 2024
  4. T. Muller, S. Ragot, L. Gros, P. Scalart, "Speech quality evaluation of neural audio codecs," Proc. Interspeech, Sept. 2024
  5. T. Muller, S. Ragot, P. Philippe, P. Scalart, "Post-Training Latent Dimension Reduction in Neural Audio Coding," Proc. EUSIPCO, Aug. 2024
  6. T. Muller, S. Ragot, Q. Lemesle, P. Philippe, P. Scalart, "Quantification optimisée de l’espace latent en codage audio neuronal," Proc. GRETSI 2023, Aug./Sept. 2023
  7. S. Ragot, A. Vasilache, "Spherical vector quantization for spatial direction coding," Proc. ICASSP, June 2023
  8. M. Yaoumi, P. Mahé, S. Ragot, "Codage audio avec une modélisation de spectrogramme par auto-encodeur," Proc. GRETSI, Nancy, Sept. 2022
  9. S. Ragot, M. Yaoumi, "On the Quantization of the Uniform Source on the n-Sphere (n=1, 2, 3)," 5th conference on Geometric Science of Information, Paris, July 2021
  10. P. Mahé, S. Ragot, S. Marchand, J. Daniel, "Ambisonic Coding with Spatial Image Correction," Proc. EUSIPCO, Amsterdam, Sept. 2020
  11. V. Lemaire, F. Boitier, J. Pesic, A. Bondu, S. Ragot, F. Clérot, "Proactive Fiber Break Detection Based on Quaternion Time Series and Automatic Variable Selection from Relational Data," Proc. AALTD, Sept. 2019
  12. P. Mahé, S. Ragot, S. Marchand, "First-order ambisonic coding with quaternion-based interpolation of PCA rotation matrices," Proc. EAA Spatial Audio Signal Processing Symposium, Paris, France, Sept. 2019, pp. 7-12
  13. P. Mahé, S. Ragot, S. Marchand, "First-Order Ambisonic Coding with PCA Matrixing and Quaternion-Based Interpolation," Proc. DAFx, Birmingham, UK, Sept. 2019
  14. N. Majed, S. Ragot, L. Gros, X. Lagrange, A. Blanc, "Application-Layer Redundancy for the EVS Codec," Proc. EUSIPCO, Rome, Italy, Sept. 2018, pp. 2090-2094
  15. G. Mittag, S. Möller, V. Barriac, S. Ragot, "Quantifying Quality Degradation of the EVS Super-Wideband Speech Codec," Proc. IEEE QoMEX, Sardinia, Italy, May-June 2018
  16. N. Majed, S. Ragot, X. Lagrange, A. Blanc, J. Dufour, G. Grao, "Experimental evaluation of WebRTC voice quality in LTE coverage tests," Proc. IEEE QoMEX, Erfurt, Germany, May-June 2017
  17. N. Majed, S. Ragot, X. Lagrange, A. Blanc, "Delay and quality metrics in Voice over LTE (VoLTE) networks: an end-terminal perspective," Proc. IEEE ICNC, San Francisco, USA, Jan. 2017
  18. N. Souviraa-Labastie, S. Ragot, "On the applicability of the SBC codec to support super-wideband speech in Bluetooth handsfree communications," Proc. IEEE MMSP, Montreal, Canada, Sept. 2016
  19. M. Kaniewska, S. Ragot, Z. Liu, L. Miao, X. Zhang, J. Gibbs, V. Eksler, "Enhanced AMR-WB Bandwidth Extension in 3GPP EVS Codec," Proc. GlobalSIP, Orlando, Florida, Dec. 2015
  20. M. Dietz, M. Multrus, V. Eksler, V. Malenovsky, E. Norvell, H. Pobloth, L. Miao, Z. Wang, L. Laaksonen, A. Vasilache, Y. Kamamoto, K. Kikuiri, S. Ragot, J. Faure, H. Ehara, V. Rajendran, V. Atti, H. Sung, E. Oh, H. Yuan, "Overview of the EVS codec architecture," Proc. ICASSP, Brisbane, Australia, May 2015
  21. S. Bruhn, H. Pobloth, M. Schnell, B. Grill, J. Gibbs, L. Miao, K. Järvinen, L. Laaksonen, N. Harada, N. Naka, S. Ragot, S. Proust, T. Sanda, I. Varga, C. Greer, M. Jelinek, M. Xie, P. Usai "Standardization of the new 3GPP EVS codec," Proc. ICASSP, Brisbane, Australia, May 2015
  22. D. Virette, Y. Lang, L. Miao, W. Wu, B. Kövesi, C. Lamblin, S. Ragot, "G.722 Annex D and G.711.1 Annex F - New ITU-T stereo codecs," Proc. ICASSP, Vancouver, Canada, Mai 2013
  23. Lei Miao, Zexin Liu, Chen Hu, V. Eksler, S. Ragot, C. Lamblin, B. Kovesi, Jongmo Sung, M. Fukui, S. Sasaki, Y. Hiwasaki, "G.711.1 Annex D and G.722 Annex B - New ITU-T superwideband codecs," Proc. ICASSP, Prague, Czech Republic, Mai 2011
  24. B. Kovesi, S. Ragot, C. Lamblin, Lei Miao, Zexin Liu, Chen Hu, "Re-engineering ITU-T G.722: Low delay and complexity superwideband coding at 64 kbit/s with G.722 bitstream watermarking," Proc. ICASSP, Prague, Czech Republic, Mai 2011
  25. T.M.N. Hoang, S. Ragot,, B. Kövesi, P. Scalart, "Parametric stereo extension of ITU-T G.722 based on a new downmixing scheme," Proc. IEEE MMSP, St Malo, France, Oct. 2010
  26. T.M.N. Hoang, S. Ragot, M. Oger, and M. Antonini, "A new bitplane coder for scalable transform audio coding," Proc. ICASSP, Taipei, Taiwan, Avril 2009
  27. T.M.N. Hoang, S. Ragot, M. Oger, and M. Antonini, "Nouvelle méthode de codage par plans de bits pour les signaux de parole et audio," Proc. CORESA, Toulouse, France, Mars 2009
  28. S. Bruhn, V. Grancharov, B. Kleijn, J. Klejsa, M. Li, H. Pobloth, S. Ragot, "The FlexCode Speech and Audio Coding Approach," 8th ITG Conference Speech Communication, Aachen, Allemagne, Oct. 2008
  29. Y. Hiwasaki, S. Sasaki, H. Ohmuro, T. Mori, J. Seong, M.S. Lee, B. Kovesi, S. Ragot, J.-L. Garcia, C. Marro, L. Miao, J. Xu, V. Malenovsky, J. Lapierre, R. Lefebvre, "G.711.1: a wideband extension to ITU-T G.711," EUSIPCO, Lausanne, Suisse, Aout 2008
  30. B. Kövesi, S. Ragot, M. Gartner, H. Taddei, "Pre-echo reduction in the ITU-T G.729.1 embedded coder," EUSIPCO, Lausanne, Suisse, Aout 2008
  31. T. Vaillancourt, M. Jelinek, A.E. Ertan, J. Stachurski, A. Ramo, L. Laaksonen, J. Gibbs, U. Mittal, S. Bruhn, V. Grancharov, M. Oshikiri, H. Ehara, D. Zhang, F. Ma, D. Virette, S. Ragot, "ITU-T EV-VBR: a robust 8-32 kbit/s scalable coder for error prone telecommunications channels," EUSIPCO, Lausanne, Suisse, Aout 2008
  32. B. Kövesi, S. Ragot, A. Le Guyader, "An 64-80-96 kbit/s Scalable Wideband Speech Coding Candidate for ITU-T G.711-WB Standardization," Proc. ICASSP, Las Vegas, Nevada, USA, Mars-Avril 2008
  33. B. Kövesi and S. Ragot, "A low complexity packet loss concealment algorithm for ITU-T G.722," Proc. ICASSP, Las Vegas, Nevada, USA, Mars-Avril 2008
  34. S.K. Jung, S. Ragot, C. Lamblin, and S. Proust, "An embedded variable bit-rate coder based on GSM EFR: EFR-EV," Proc. ICASSP, Las Vegas, Nevada, USA, Mars-Avril 2008
  35. T.M.N. Hoang, M. Oger, S. Ragot, and M. Antonini, "Embedded transform coding of audio signals by model-based bit plane coding," Proc. ICASSP, Las Vegas, Nevada, USA, Mars-Avril 2008
  36. M. Oger, S. Ragot, and M. Antonini, "Model-based deadzone optimization for stack-run audio coding with uniform scalar quantization," Proc. ICASSP, Las Vegas, Nevada, USA, Mars-Avril 2008
  37. S. Ragot, B. Kövesi, R. Trilling, D. Virette, N. Duc, D. Massaloux, S. Proust, B. Geiser, M. Gartner, S. Schandl, H. Taddei, Y. Gao, E. Shlomot, H. Ehara, K. Yoshida, T. Vaillancourt, R. Salami, M.S. Lee, D.Y. Kim, "ITU-T G.729.1: An 8-32 kbit/s scalable coder interoperable with G.729 for wideband telephony and Voice over IP," Proc. ICASSP, Honolulu, Hawaii, USA, Avril 2007
  38. D. Massaloux, R. Trilling, C. Lamblin, S. Ragot, E. Ehara, M.S. Lee, D.Y. Kim, and B. Bessette, "An 8-12 kbit/s embedded CELP coder interoperable with ITU-T G.729 coder: first stage of the new G.729.1 standard," Proc. ICASSP, Honolulu, Hawaii, USA, Avril 2007
  39. M. Oger, S. Ragot, and M. Antonini, "Transform audio coding with arithmetic-coded scalar quantization and model-based bit allocation," Proc. ICASSP, Honolulu, Hawaii, USA, Avril 2007
  40. M. Oger, S. Ragot, and M. Antonini, "Low-complexity wideband LSF quantization by predictive KLT coding and generalized Gaussian modeling," Proc. EUSIPCO, Florence, Italie, Sept. 2006
  41. M. Oger, J. Bensa, S. Ragot, and M. Antonini, "Stack-run audio coding", AES 120th convention, Paris, France, Mai 2006
  42. S. Ragot, B. Kövesi, D.Virette, R. Trilling, and D. Massaloux, "A 8-32 kbit/s scalable wideband speech and audio coding candidate for ITU-T G729EV standardization," Proc. ICASSP, Toulouse, France, Mai 2006
  43. M. Oger, S. Ragot, and M. Antonini, "Model-based coding of LPC parameters for speech compression," Proc. CORESA, Rennes, France, Nov. 2005
  44. M. Oger, S. Ragot, and R. Lefebvre, "Companded Lattice VQ for Efficient Parametric LPC Quantization," Proc. EUSIPCO, Vienne, Autriche, Sept. 2004
  45. M. Oger, S. Ragot, and R. Lefebvre, "Wideband LPC Spectrum Envelope Coding Based on Gaussian Mixture Models and Companded Lattice VQ," Proc. 22nd Biennial Symposium on Communications, Kingston, ON, Canada, Juin 2004
  46. S. Ragot, B. Bessette, and R. Lefebvre, "Low-Complexity Multi-Rate Lattice Vector Quantization with Application to Wideband TCX Speech Coding at 32 kbit/s," Proc. ICASSP, Montreal, Canada, Mai 2004
  47. S. Ragot, H. Lahdili, and R. Lefebvre, "Wideband LSF Quantization by Generalized Voronoi Codes," Proc. Eurospeech, Aalborg, Danemark, Sept. 3-7, 2001
  48. S. Ragot, M. Xie, and R. Lefebvre, "Near-Ellipsoidal Lattice Quantization by Generalized Voronoi Coding," Proc. Canadian Workshop on Information Theory, Vancouver, BC, Canada, Juin 3-6, 2001
  49. V.T. Ruoppila and S. Ragot, "Index assignment for predictive wideband LSF quantization," Proc. IEEE Workshop on Speech Coding, Delevan, Wisconsin, USA, Sept. 17-20, 2000
  50. L. Tancerel, S. Ragot, V.T. Ruoppila, and R. Lefebvre, "Combined Speech and Audio Coding by Discrimination," Proc. IEEE Workshop on Speech Coding, Delevan, Wisconsin, USA, Sept. 17-20, 2000
  51. L. Tancerel, S. Ragot, and R. Lefebvre, "Speech/music discrimination for Universal Audio Coding," Proc. 20th Biennal Symposium on Communications, Queen's University, Kingston, Canada, May 28-31, 2000
  52. S. Ragot, R. Lefebvre, R. Salami, and J.-P. Adoul, "Stochastic-algebraic wideband LSF quantization," Proc. ICASSP, Istanbul, Turquie, June 5-9, 2000
  53. S. Ragot, J.-P. Adoul, R. Lefebvre, and R. Salami, "Low complexity LSF quantization for wideband speech coding," Proc. IEEE Workshop on Speech Coding, Haikko Manor, Porvoo, Finlande, June 20-23, 1999
  54. S. Ragot, R. Salami, and R. Lefebvre, "Design of Test Sequences for G.729 Annex E," Proc. IEEE Workshop on Speech Coding, Haikko Manor, Porvoo, Finlande, June 20-23, 1999

Mémoire et thèse

Brevets délivrés

  • Method and Device for Multirate Scalable Lattice Vector Quantization, US7,106,228
  • Methods and Devices for audio compression based on Acelp/Tcx coding and multi-rate lattice vector quantization, CA2457988
  • Hierarchical Encoding/Decoding Device, EP1905010
  • Method for Switching Rate– and Bandwidth–Scalable Audio Decoding Rate, EP1907812