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Book chapter
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B. Geiser, S. Ragot, and H. Taddei
"Embedded Speech Coding: From G.711 to G.729.1,"
Chapter 8 in Advances in Digital Speech Transmission (R. Martin, U. Heute, C. Antweiler, eds.), Wiley, Jan. 2008, pp. 201-248
Journal articles
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S. Ragot, B. Kovesi, A. Le Guyader,
"Noise Feedback Coding Revisited: Refurbished Legacy Codecs and New Coding Models (invited paper),"
ZTE Communications, Special issue on Emerging Technologies for Multimedia Coding, Analysis and Transmission, vol. 10, no. 2, pp. 37-47, June 2012
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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
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S. Ragot, M. Xie, and R. Lefebvre,
"Near-Ellipsoidal Voronoi Coding,"
IEEE Transactions on Information Theory, vol. 49, no. 3, pp. 1815-1820, Jul. 2003
- 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, Dec. 2001
Conference articles
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T. Muller, S. Ragot, Q. Lemesle, P. Philippe, P. Scalart,
"Optimized quantization of latent space in neural audio coding (in French),"
Proc. GRETSI 2023, Aug./Sept. 2023
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S. Ragot, A. Vasilache,
"Spherical vector quantization for spatial direction coding,"
Proc. ICASSP, June 2023
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M. Yaoumi, P. Mahé, S. Ragot,
"Audio coding by an autoencoder representation of the spectogram (in French),"
Proc. GRETSI, Nancy, Sept. 2022
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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
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P. Mahé, S. Ragot, S. Marchand, J. Daniel,
"Ambisonic Coding with Spatial Image Correction,"
Proc. EUSIPCO, Amsterdam, Sept. 2020
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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
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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
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P. Mahé, S. Ragot, S. Marchand,
"First-Order Ambisonic Coding with PCA Matrixing and Quaternion-Based Interpolation,"
Proc. DAFx, Birmingham, UK, Sept. 2019
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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
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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
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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
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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
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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
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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
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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
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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
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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, May 2013
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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, May 2011
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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, May 2011
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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
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T.M.N. Hoang, S. Ragot, M. Oger, and M. Antonini,
"A new bitplane coder for scalable transform audio coding,"
Proc. ICASSP, Taipei, Taiwan, April 2009
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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, March 2009 (in French)
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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, Germany, Oct. 2008
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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, Switzerland, Aug. 2008
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B. Kövesi, S. Ragot, M. Gartner, H. Taddei,
"Pre-echo reduction in the ITU-T G.729.1 embedded coder," EUSIPCO, Lausanne, Switzerland, Aug. 2008
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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, Switzerland, Aug. 2008
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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, March-April 2008
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B. Kövesi and S. Ragot,
"A low complexity packet loss concealment algorithm for ITU-T G.722,"
Proc. ICASSP, Las Vegas, Nevada, USA, March-April 2008
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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, March-April 2008
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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, March-April 2008
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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, March-April 2008
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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, April 2007
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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, April 2007
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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, April 2007
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M. Oger, S. Ragot, and M. Antonini,
"Low-complexity wideband LSF quantization by predictive KLT coding and generalized Gaussian modeling,"
Proc. EUSIPCO, Florence, Italia, Sept. 2006
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M. Oger, J. Bensa, S. Ragot, and M. Antonini,
"Stack-run audio coding",
AES 120th convention, Paris, France, May 2006
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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, May 2006
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M. Oger, S. Ragot, and M. Antonini,
"Model-based coding of LPC parameters for speech compression,"
Proc. CORESA, Rennes, France, Nov. 2005 (in French)
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M. Oger, S. Ragot, and R. Lefebvre,
"Companded Lattice VQ for Efficient Parametric LPC Quantization,"
Proc. EUSIPCO, Vienna, Austria, Sept. 2004
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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, June 2004
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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, May 2004
- S. Ragot, H. Lahdili, and R. Lefebvre,
"Wideband LSF Quantization by Generalized Voronoi Codes,"
Proc. Eurospeech, Aalborg, Danemark, Sept. 3-7, 2001
- S. Ragot, M. Xie, and R. Lefebvre,
"Near-Ellipsoidal Lattice Quantization by Generalized Voronoi Coding,"
Proc. Canadian Workshop on Information Theory, Vancouver, BC, Canada, June 3-6, 2001
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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
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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
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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
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S. Ragot, R. Lefebvre, R. Salami, and J.-P. Adoul,
"Stochastic-algebraic wideband LSF quantization,"
Proc. ICASSP, Istanbul, Turkey, June 5-9, 2000
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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, Finland, June 20-23, 1999
- 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, Finland, June 20-23, 1999
Theses
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S. Ragot,
New techniques of algebraic vector quantization based on Voronoi coding – Application to AMR-WB+ coding,
Ph.D. thesis, Department of Electrical and Computer Engineering, University of Sherbrooke, QC, Canada, May 2003 (in French)
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S. Ragot,
The hexacode, the Golay code and the Leech lattice: definition, construction, application to quantization,
Master thesis, Department of Electrical and Computer Engineering, University of Sherbrooke, QC, Canada, Dec. 1999 (in French)
Granted Patents
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Method and Device for Multirate Scalable Lattice Vector Quantization, US7106228
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Methods and Devices for audio compression based on Acelp/Tcx coding and multi-rate lattice vector quantization, CA2457988
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Hierarchical Encoding/Decoding Device, EP1905010
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Method for Switching Rate– and Bandwidth–Scalable Audio Decoding Rate, EP1907812
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