VoiceAge research
in speech and audio compression is carried
out by our world-renowned researchers both
in Montreal and in the Speech
and Audio Compression Research Group at the
Université de Sherbrooke,
which is fully dedicated to the VoiceAge research
and development program.
Members of our research team were the principal inventors of the ACELP® technology platform, which has led to more than five hundred granted patents and patent applications that are included in fifteen international telecommunication standards.
VoiceAge researchers participate in ongoing scientific and professional conference and publishing activities, and VoiceAge business professionals contribute to communications industry publications and conferences. Scroll down the page to learn about these activities, or use a quick link on the right. |
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Topics on this page
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Conferences
G. FUCHS and R. LEFEBVRE, "A Scalable CELP/Transform Coder for Low Bit Rate Speech and Audio Coding," Proc. 120th AES Convention, Paris, FRANCE, May 2006.
J. FILLION-DENEAULT and R. LEFEBVRE, "Coherence Enhanced Minimum Statistics Spectral Subtraction in Bi-Microphone Systems," Proc. 120th AES Convention, Paris , FRANCE , May 2006.
J. LAPIERRE and R. LEFEBVRE, "On Improving Parametric Stereo Audio Coding," Proc. 120th AES Convention, Paris , FRANCE , May 2006.
V. VILAYSOUK and R. LEFEBVRE, "A Hybrid Concealment Algorithm for Non-Predictive Wideband Audio Coders," Proc. 120th AES Convention, Paris , FRANCE , May 2006.
E. RAVELLI, P. GOURNAY and R. LEFEBVRE, "A Two-Stage MLP+NLMS Lossless Coder for Stereo Audio," in Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Toulouse , FRANCE , May 2006.
K. D. ANDERSON and P. GOURNAY, "Pitch Resynchronization while Recovering from a Late Frame in a Predictive Speech Decode,r" in Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Toulouse, FRANCE, May 2006.
M. CHIBANI, R. LEFEBVRE and P. GOURNAY, "Resynchronization of the Adaptive Codebook in a Constrained CELP Codec After a Frame Erasure," in Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Toulouse, FRANCE, May 2006.
P. GOURNAY and K. D. ANDERSON, "Performance Analysis of a Decoder-Based Time Scaling Algorithm for Variable Jitter Buffering of Speech Over Packet Networks," in Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Toulouse, FRANCE, May 2006.
R. MOUSSAOUI, J. ROUAT and R. LEFEBVRE, "Wavelet Based Independent Component Analysis for Multi-Channel Source Separation," in Proc. IEEE Int. Conf. on Acoustics, Speech and Signal Processing, Toulouse , FRANCE , May 2006.
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2005
M. CHIBANI, P. GOURNAY,
and R. LEFEBVRE, "Increasing the Robustness
of CELP-Based Coders by Constrained Optimization," in Proc. IEEE Int. Conf. on Acoustics, Speech
and Signal Processing, Philadelphia, U.S.A.,
March 2005.
B. BESSETTE, R.
LEFEBVRE, and R. SALAMI, "Universal Speech/Audio
Coding Using Hybrid ACELP/TCX Techniques,"
in Proc. IEEE Int. Conf. on Acoustics, Speech
and Signal Processing, Philadelphia, U.S.A.,
March 2005.
G. FUCHS and R.
LEFEBVRE, "A Speech Coder Post-Processor
Controlled By Side-Information," in Proc.
IEEE Int. Conf. on Acoustics, Speech and Signal
Processing, Philadelphia, U.S.A., March 2005.
S. BRUHN, B. BESSETTE,
J. MÄKINEN, P. OJALA, R. SALAMI, and A.
TALEB, "AMR-WB+: A New Audio Coding Standard
for 3rd Generation Mobile Audio Services,"
in Proc. IEEE Int. Conf. on Acoustics, Speech
and Signal Processing, Philadelphia, U.S.A.,
March 2005.
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2004
M. JELINEK, R. SALAMI,
and S. AHMADI, “VMR-WB – Operation
of the 3GPP2 Wideband Speech Coding Standard,”
in Proc. Telecommunications and Signal Processing
(TSP), pp. 154-157, Brno, Czech Republic, September
2004.
M. JELINEK and R.
SALAMI, "Noise Reduction Method for Wideband
Speech Coding," European Signal Processing
Conf. (Eusipco), Vienna, Austria, September,
2004.
M. OGER, S. RAGOT,
and R. LEFEBVRE, "Companded Lattice VQ
for Efficient Parametric LPC Quantization,"
Eusipco-2004, 12th European Signal Processing
Conference, Vienna, Austria, Sept. 6-10, 2004.
M. OGER, S. RAGOT,
and R. LEFEBVRE, "Wideband LPC Spectrum
Envelope Coding Based on Gaussian Mixture Models
and Companded Lattice VQ," 22nd Biennial
Symposium on Communications, Kingston, Ontario,
June 1-3, 2004.
J.-L. GARCIA, P.
GOURNAY, and R. LEFEBVRE, "Backward linear
prediction for lossless coding of stereo audio,"
Proc. 116th AES Convention, Berlin, Germany,
May 2004.
M. JELINEK, R. SALAMI,
S. AHMADI, B. BESSETTE, P. GOURNAY, and C. LAFLAMME,
"On the architecture of the CDMA2000 variable-rate
multimode wideband (VMR-WB) speech coding standard,"
Proc. IEEE Int. Conf. on Acoustics, Speech and
Signal Processing (ICASSP), Vol. 1, pp. 281-284,
Montreal, Canada, May 2004.
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. IEEE Int. Conf. on Acoustics, Speech and
Signal Processing, Montreal, Canada, May 2004.
R. LEFEBVRE, P.
GOURNAY, and R. SALAMI, "A study of design
compromises for speech coders in packet networks,"
Proc. IEEE Int. Conf. on Acoustics, Speech and
Signal Processing, Montreal, Canada, May 2004.
M. JELINEK, R. SALAMI,
S. AHMADI, B. BESSETTE, P. GOURNAY, C. LAFLAMME,
and R. LEFEBVRE, "Advances in source-controlled
variable bit rate wideband speech coding,"
Special Workshop In Maui (SWIM), Lectures by
Masters in Speech Processing, Maui, Hawaii,
Jan. 12-14, 2004.
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2003
T. GAGNON and R.
LEFEBVRE, “A neural-network approach for
pre-classification in musical chords recognition,”
Proc. 37th Asilomar Conference on Signals, Systems
and Computers, Asilomar, Pacific Grove, November
9-12, 2003.
M. KWONG and R.
LEFEBVRE, “Transient detection of audio
signals based on an adaptive comb filter in
the frequency domain,” Proc. 37th Asilomar
Conference on Signals, Systems and Computers,
Asilomar, Pacific Grove, November 9-12, 2003.
S. AHMADI, M. JELINEK,
R. SALAMI and S.C. GREER, “Wideband Speech
Coding for cdma2000® Systems,” Asilomar
Conference on Signals, Systems, and Computers,
Pacific Grove, CA, U.S.A., November 2003.
P. GOURNAY, F. ROUSSEAU,
and R. LEFEBVRE, “Improving packet loss
recovery using late frames for prediction-based
speech coders,” Proc. IEEE Int. Conf.
on Acoustics, Speech and Signal Processing,
Hong Kong, pp. I-108 to I-111, April 2003.
L. BONNET and R.
LEFEBVRE, “High resolution multipitch
analysis of guitar chords,” Proc. 114th
AES Convention, Amsterdam, The Netherlands,
March 2003.
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2002
R. SALAMI, B. BESSETTE,
R. LEFEBVRE, and M. JELINEK, “The Adaptive
Multi-Rate Wideband Codec: History and Performance,”
IEEE Speech Coding Workshop, Ibaraki, Japan,
pp. 144-146, October 2002.
B. BESSETTE, R.
SALAMI, R. LEFEBVRE, and M. JELINEK, “Efficient
methods for high quality low bit rate wideband
speech coding,” IEEE Speech Coding Workshop,
Ibaraki, Japan, pp. 114-116, October 2002.
M. TAMMI and M.
JELINEK, “Signal Modification for Voiced
Wideband Speech Coding and Its Application for
IS-95,” Proc. IEEE Workshop on Speech
Coding, Ibaraki, Japan, pp. 35-37, October 2002.
M. TAMMI and M.
JELINEK, “Signal Modification for Coding
Purely Voiced Sections in a Wideband ACELP Speech
Coder,” Proc. XI European Signal Processing
Conf. (Eusipco), Toulouse, France, Vol. 1, pp.
427-430, September 2002.
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2001
B. BESSETTE, R.
LEFEBVRE, R. SALAMI, M. JELINEK, J. VAINIO,
J. ROTOLA-PUKKILA, H. MIKKOLA, and K. JÄRVINEN,
“Techniques for high-quality ACELP coding
of wideband speech,” Eurospeech, Aalborg,
Denmark, Vol. 3, pp. 1997-2000, September 2001.
J. ROTOLA-PUKKILA,
J. VAINIO, H. MIKKOLA, K. JÄRVINEN, B.
BESSETTE, R. LEFEBVRE, R. SALAMI, and M. JELINEK,
“AMR wideband speech codec – leap
forward in mobile communications quality,”
Eurospeech, Aalborg, Denmark, Vol. 4, pp. 2303-2306,
September 2001.
S. RAGOT, H. LAHDILI,
and R. LEFEBVRE, “Wideband LSF quantization
by generalized Voronoi codes,” Eurospeech,
Aalborg, Denmark, pp. 2319-2322, September 3-7,
2001.
S. RAGOT, M. XIE,
and R. LEFEBVRE, "Near-Ellipsoidal Lattice
Quantization by Generalized Voronoi Shaping,"
Proceedings of the 7th Canadian Workshop on
Information Theory, Vancouver, BC, Canada, pp.
24-27, June 3-6, 2001.
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2000
M. JELINEK and F.
LABONTÉ, “Robust signal/noise discrimination
for wideband speech and audio coding,”
Proc. IEEE Workshop on Speech Coding, Delevan,
Wisconsin, U.S.A., pp. 151-153, September 17-20,
2000.
J.-M. VALIN and
R. LEFEBVRE, "Bandwidth Extension of Narrowband
Speech for Low Bit-Rate Wideband Coding,"
IEEE Workshop on Speech Coding, Delevan, Wisconsin,
U.S.A., pp. 134-136, September 17-20, 2000.
L. TANCEREL, S.
RAGOT, V.T. RUOPPILA, and R. LEFEBVRE, "Combined
Speech and Audio Coding by Discrimination,"
IEEE Workshop on Speech Coding, Delevan, Wisconsin,
U.S.A., pp. 158-160, September 17-20, 2000.
L. TANCEREL, S.
RAGOT, and R. LEFEBVRE, "Speech/music Discrimination
for Universal Audio Coding," 20th Biennial
Symposium on Communications, Queen's University,
Kingston, Canada, May 28-31, 2000.
S. RAGOT, R. LEFEBVRE,
R. SALAMI, and J.-P. ADOUL, "Stochastic-algebraic
wideband LSF quantization," IEEE International
Conference on Acoustics, Speech, and Signal
Processing, Istanbul, Turkey, June 5-9, 2000.
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1987-1999
B. BESSETTE, R.
SALAMI, C. LAFLAMME, and R. LEFEBVRE, "A
Wideband Speech and Audio Codec at 16/24/32
kbit/s Using Hybrid ACELP/TCX Techniques,"
Proc. 1999 IEEE Workshop on Speech Coding, Porvoo,
Finland, pp. 7-9, June 1999.
S. RAGOT, J.-P.
ADOUL, R. LEFEBVRE, and R. SALAMI, "Low
Complexity LSF Quantization for Wideband Speech
Coding," Proc. 1999 IEEE Workshop on Speech
Coding, Porvoo, Finland, pp. 22-24, June 1999.
S. RAGOT, R. SALAMI,
and R. LEFEBVRE, "Design of Test Sequences
for G.729 Annex E," Proc. 1999 IEEE Workshop
on Speech Coding, Porvoo, Finlande, pp. 120-122,
June 1999.
M. JELINEK and J.-P.
ADOUL, "Frequency domain spectral envelope
estimation for low rate coding of speech,"
Proc. ICASSP’99, Phoenix, AR, Vol.1, pp.
253-256, March 1999.
R. SALAMI, R. LEFEBVRE,
and C. LAFLAMME, "A wideband codec at 16/24
kbit/s with 10 ms frames," Proc. 1997 IEEE
Workshop on Speech Coding, Pennsylvania, U.S.A.,
pp. 103-104, September 1997.
R. LEFEBVRE and
C. LAFLAMME, "Shaping Coding Noise with
Frequency-Domain Companding," Proc. 1997
IEEE Workshop on Speech Coding, Pennsylvania,
U.S.A., pp. 61-62, September 1997.
R. SALAMI et al.,
"Description of GSM enhanced full rate
speech codec," Proc. ICC’97, Montreal,
Canada, June 8-12, 1997.
R. SALAMI, C. LAFLAMME,
B. BESSETTE and J.-P. ADOUL, "Description
of ITU-T Recommendation G.729 Annex A: reduced
complexity 8 kbit/s CS-ACELP codec," Proc.
ICASSP’97, Munich, Germany, April 21-24,
1997.
T. HONKANEN, J.
VAINIO, K. JARVINEN, P. HAAVISTO, R. SALAMI,
C. LAFLAMME, and J.-P. ADOUL, "Enhanced
full rate speech codec for IS-136 digital cellular
system," Proc. ICASSP’97, Munich,
Germany, April 21-24, 1997.
K. JARVINEN, J.
VAINIO, P. KAPANEN, T. HONKANEN, P. HAAVISTO,
R. SALAMI, C. LAFLAMME, and J.-P. ADOUL, "GSM
enhanced full rate speech codec," Proc.
ICASSP’97, Munich, Germany, April 21-24,
1997.
R. LEFEBVRE and
C. LAFLAMME, "Spectral Amplitude Warping
(SAW) for Noise Spectrum Shaping in Audio Coding,"
Proc. ICASSP’97, Munich, Germany, pp.
335-338, April 21-24, 1997.
C. LAFLAMME, R.
SALAMI, R. MATMTI, and J.-P. ADOUL, "Harmonic-stochastic
excitation (HSX) speech coding below 4 kbit/s,"
Proc. ICASSP’96.
M. XIE, and J.-P.
ADOUL, "Embedded Algebraic Vector Quantizer
(EAVQ) with Application to Wideband Speech Coding,"
Proc. ICASSP’96.
R. SALAMI et al.,
"Description of the proposed ITU-T 8 kb/s
speech coding standard," Proceedings of
IEEE Workshop on Speech Coding for Telecomm.,
Annapolis, Maryland, U.S.A., pp. 3-4, September
20-22, 1995.
J.-M. LEROUX, R.
LEFEBVRE, and J.-P. ADOUL, "Comparison
of the wavelet decomposition and the Fourier
transform in TCX encoding of wideband speech
and audio," Proc. IEEE ICASSP’95,
pp. 3083-3086, May 1995.
R. LEFEBVRE and
J.-P. ADOUL, "High quality coding of wideband
audio signals in the range 16 kbits/s to and
32 kbits/s," Proc. 17th Biennial Symposium
on Communications, Kingston, Ontario, pp. 123-126,
June 1994.
R. SALAMI, C. LAFLAMME,
and J.-P. ADOUL, "8 kbit/s ACELP coding
of speech with a 10 ms speech-frame: a candidate
for CCITT standardization," Proc. ICASSP’94,
pp. II-97-100, April 1994.
R. LEFEBVRE, R.
SALAMI, C. LAFLAMME, and J.-P. ADOUL, "High
quality coding of wideband audio signals using
Transform Coded eXcitation (TCX)," Proc.
ICASSP’94, pp. I-193-196, April 1994.
R. SALAMI, C. LAFLAMME,
and J.-P. ADOUL, "ACELP speech coding at
8 kbit/s with a 10 ms frame: a candidate for
CCITT standardization," Proceedings of
IEEE Workshop on Speech Coding for Telecomm.,
St. Adele, Quebec, Canada, pp. 23-24, October
13-15, 1993.
R. LEFEBVRE, R.
SALAMI, C. LAFLAMME, and J.-P. ADOUL, "8
kbps coding of speech with 6 ms frame-length,"
Proc. ICASSP’93, Minneapolis, Minnesota,
pp. II-612-615, 1993.
R. SALAMI, C. LAFLAMME,
and J.-P. ADOUL, "Real time implementation
of a 9.6 kbps ACELP wideband speech coder,"
IEEE GLOBECOM-92, Orlando FL, pp. 447-451, December
1992.
A. LE FLOC’H,
R. SALAMI, B. MOUY, and J.-P. ADOUL, "Evaluation
of linear and non-linear spectral subtraction
methods for enhancing noisy speech," Symposium
on speech in hostile environment, Cannes, France,
November 1992.
V. SANCHEZ, C. LAFLAMME,
R. SALAMI, and J.-P. ADOUL, "Low delay
algebraic CELP coding of wideband speech,"
EUSIPCO 92, Brussels, Belgium, August 1992.
C. LAFLAMME, R.
A. SALAMI, and J.-P. ADOUL, "Wideband ACELP
speech coding at 9.6 kb/s," Proceedings
of IEEE Workshop on Speech Coding for Telecomm.,
Whistler, B.C., Canada, pp. 19-20, September
11-13, 1991.
C. LAFLAMME, J.-P.
ADOUL, R. A. SALAMI, S. MORISSETTE, and P. MABILLEAU,
"16 kbps wideband speech coding technique
based on algebraic CELP," Proc. ICASSP'91,
pp. 13-16.
C. LAFLAMME, J.-P.
ADOUL, H.Y. SU, and S. MORISSETTE, "On
Reducing Computational Complexity of Codebook
Search in CELP Coder Through the Use of Algebraic
Codes," International Conf. on Acoustics,
Speech & Signal Processing, ICASSP '90,
Albuquerque, New Mexico, April 3-6, 1990.
C. LAFLAMME, J.-P.
ADOUL, and S. MORISSETTE, "A Real Time
4.8 kbit/sec CELP on a Single DSP Chip (TMS320c25),"
IEEE Workshop on Speech Coding for Telecommunications,
Vancouver, B.C., September 5-8, 1989.
J.-P. ADOUL et al.,
"Fast CELP coding based on algebraic codes,"
Proc. ICASSP'87, pp. 1957-1960, 1987.
J.-P. ADOUL and
C. LAMBLIN, "A comparison of some algebraic
structures for CELP coding of speech,"
Proc. ICASSP'87, pp. 1953-1956, 1987.
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Journal articles
S. AHMADI and M. JELINEK, "On the Architecture, Operation, and Applications of VMR-WB: The New cdma2000 Wideband Speech Coding Standard," IEEE Transactions on Communications, Vol. 44, No. 5, May 2006.
R. SALAMI, R. LEFEBVRE, A. LAKANIEMI, K. KONTOLA, S. BRUHN and A. TALEB, "Extended AMR-WB for High-Quality Audio on Mobile Devices," IEEE Transactions on Communications, Vol. 44, No. 5, May 2006. (Downloadable)
S. RAGOT, M. XIE,
and R. LEFEBVRE, "Near-Ellipsoidal Voronoi
Coding," IEEE Transactions on Information
Theory, Vol. 49, No. 7, pp. 1815-1820, July
2003.
B. BESSETTE, R.
SALAMI, R. LEFEBVRE, M. JELINEK, J. ROTOLA-PUKKILA,
J. VAINIO, H. MIKKOLA, and K. JARVINEN, "The
Adaptive Multi-Rate Wideband Speech Codec (AMR-WB)," Special Issue of IEEE Transactions on Speech
and Audio Processing, Vol. 10, No. 8, pp. 620-636,
November 2002.
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, December 2001.
R. SALAMI et al.,
"Design and description of CS-ACELP: a
toll quality 8 kb/s speech coder." IEEE
Trans. on Speech and Audio Proc., Vol. 6, No.
2, pp. 116-130, March 1998.
R. SALAMI, C. LAFLAMME,
B. BESSETTE, and J.-P. ADOUL, "ITU-T Recommendation
G.729 Annex A: reduced complexity 8 kbit/s CS-ACELP
codec for digital simultaneous voice and data,"
IEEE Communications Magazine., Vol. 35, No.
9, pp. 56-63, September 1997.
M. XIE and J.-P.
ADOUL, "Algebraic Vector Quantization of
LSF Parameters with Low Storage and Computational
Complexity," IEEE Trans. on Speech and
Audio, Vol. 4, No. 3, pp 234-239, May 1996.
R. SALAMI, C. LAFLAMME,
J.-P. ADOUL, and D. MASSALOUX, "A toll
quality 8 kb/s speech codec for the personal
communications system (PCS)," IEEE Trans.
on Vehicular Technology, Vol. 43, No. 3, pp.
808-816, August 1994.
V. SANCHEZ, C. LAFLAMME,
and J.-P. ADOUL, "Low-Delay Algebraic CELP
Coding Of Wideband Speech," SIGNAL PROCESSING
VI Theories and Applications, J. Vabdewalle,
R. Boite, M. Moonen, A. Oosterlinck (eds.),
Elsevier Science Publisher B.V., pp. 495-498,
1992.
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Communications
industry activities
B. DEMIR, “Enhanced
Speech and Audio Coding Technologies Enable
Innovative Mobile Multimedia Services,”
Information Quarterly, Vol. 4, No. 1, 2005.
http://www.techonline.com
Current and recent speaking engagements:
L. AMAR, “Essential Issues in VoIP Development” (panel discussion), TMC Internet
Telephony, Fort Lauderdale, January 24-27, 2006.
L. AMAR, “Enabling Rich Communications with High Quality Voice/Audio within a Packet Environment," 3GSM World Congress, Barcelona, February 13-16, 2006.
R. ROMAGNINO, “Delivering High-Quality Wideband Speech over VoIP” (with Octasic), IEC 21st Century Communications, London, March 27-30, 2006.
L. PARÉ, “VoiceAge Speech and Audio Compression Solutions," International Mobile Industry Expo, Tianjin, May 18-20, 2006.
L. PARÉ, “Delivering High-Quality Wideband Speech over VoIP," China VoIP Conference and Expo, Beijing, June 14-16, 2006.
P. GOURNAY, "Essential Codec Characteristics for High Quality VoIP & Robustness Techniques for Improving Real-World VoIP Communications," VoIP Developer Conference, Santa Clara, August 8-10, 2006.
C. GRAVEL, “Optimizing standardized 16-bit audio compression algorithms for ARM architectures,”
ARM Developers’ Conference, Santa Clara,
October 3-5, 2006.
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Book contributions
J.-P. ADOUL and
R. LEFEBVRE, "Wideband Speech Coding,"
chapter in Speech Coding and Synthesis, editors
B. Kleijn and K Paliwal, published by Elsevier,
1995.
J.-P. ADOUL, chapter
on "Lattice and Trellis coded Quantizations
for efficient Coding of Speech," editor
Antonio Rubio, published by Springer-Verlag
Publishers, 1995.
R. SALAMI et al.,
"Speech Coding," Chapter 3 in Mobile
Radio Communications, R. Steele (Ed.), Pentech
Press, 161 pages, 1992.
C. LAFLAMME, R.
SALAMI, and J.-P. ADOUL, "9.6 kbit/s ACELP
Coding of Wideband Speech," in Speech and
Audio Coding for Wireless and Network Applications,
published by Kluwer Academic Publishers, 1992.
R. A. SALAMI, "Binary
Pulse Excitation: A Novel Approach to Low Complexity
CELP Coding," in Advances in Speech Coding,
Kluwer Academic Publishers, 1991.
J.-P. ADOUL, "Advances
in Digital Coding of Speech," Chapter 3
in Advanced Digital Communications and Signal
Processing, Prentice-Hall Inc., edited by K.
Feher, pp. 133-181, 1987.
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