W. Bastiaan Kleijn
Orcid: 0000-0002-1973-3920
According to our database1,
W. Bastiaan Kleijn
authored at least 295 papers
between 1987 and 2024.
Collaborative distances:
Collaborative distances:
Awards
IEEE Fellow
IEEE Fellow 1999, "For contributions to modeling the spectral fine structure of speech and its application to low-rate speech coding.".
Timeline
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Book In proceedings Article PhD thesis Dataset OtherLinks
Online presence:
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on zbmath.org
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on orcid.org
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on id.loc.gov
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on d-nb.info
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on dl.acm.org
On csauthors.net:
Bibliography
2024
CoRR, 2024
An Effective MVDR Post-Processing Method for Low-Latency Convolutive Blind Source Separation.
Proceedings of the 18th International Workshop on Acoustic Signal Enhancement, 2024
On Accelerating Diffusion-Based Sampling Processes via Improved Integration Approximation.
Proceedings of the Twelfth International Conference on Learning Representations, 2024
Proceedings of the IEEE International Conference on Acoustics, 2024
Proceedings of the Computer Vision - ECCV 2024, 2024
Proceedings of the Thirty-Eighth AAAI Conference on Artificial Intelligence, 2024
2023
IEEE Trans. Signal Inf. Process. over Networks, 2023
A DNN Optimizer that Improves over AdaBelief by Suppression of the Adaptive Stepsize Range.
Trans. Mach. Learn. Res., 2023
On Accelerating Diffusion-Based Sampling Process via Improved Integration Approximation.
CoRR, 2023
CoRR, 2023
Estimation of Source and Receiver Positions, Room Geometry and Reflection Coefficients From a Single Room Impulse Response.
CoRR, 2023
Proceedings of the IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2023
A Deep Learning Based Fault Diagnosis Method Combining Domain Knowledge and Transfer Learning.
Proceedings of the 29th International Conference on Mechatronics and Machine Vision in Practice, 2023
Proceedings of the IEEE International Conference on Acoustics, 2023
Proceedings of the IEEE International Conference on Acoustics, 2023
Proceedings of the IEEE International Conference on Acoustics, 2023
Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition, 2023
2022
Revisiting the Primal-Dual Method of Multipliers for Optimisation Over Centralised Networks.
IEEE Trans. Signal Inf. Process. over Networks, 2022
Dirichlet Process Mixture of Generalized Inverted Dirichlet Distributions for Positive Vector Data With Extended Variational Inference.
IEEE Trans. Neural Networks Learn. Syst., 2022
On Exploiting Layerwise Gradient Statistics for Effective Training of Deep Neural Networks.
CoRR, 2022
Proceedings of the 17th International Workshop on Acoustic Signal Enhancement, 2022
Proceedings of the 23rd Annual Conference of the International Speech Communication Association, 2022
Proceedings of the IEEE International Conference on Acoustics, 2022
2021
IEEE Trans. Signal Inf. Process. over Networks, 2021
Room Acoustical Parameter Estimation From Room Impulse Responses Using Deep Neural Networks.
IEEE ACM Trans. Audio Speech Lang. Process., 2021
Proceedings of the 38th International Conference on Machine Learning, 2021
Proceedings of the IEEE International Conference on Acoustics, 2021
2020
IEEE ACM Trans. Audio Speech Lang. Process., 2020
Proceedings of the KDD '20: The 26th ACM SIGKDD Conference on Knowledge Discovery and Data Mining, 2020
Proceedings of the 21st Annual Conference of the International Speech Communication Association, 2020
Proceedings of the 2020 IEEE International Conference on Acoustics, 2020
Proceedings of the 2020 IEEE International Conference on Acoustics, 2020
Proceedings of the 23rd International Conference on Artificial Intelligence and Statistics, 2020
Proceedings of the 54th Asilomar Conference on Signals, Systems, and Computers, 2020
Proceedings of the Thirty-Fourth AAAI Conference on Artificial Intelligence, 2020
2019
IEEE Trans. Signal Inf. Process. over Networks, 2019
Derivation and Analysis of the Primal-Dual Method of Multipliers Based on Monotone Operator Theory.
IEEE Trans. Signal Inf. Process. over Networks, 2019
Variational Bayesian Learning for Dirichlet Process Mixture of Inverted Dirichlet Distributions in Non-Gaussian Image Feature Modeling.
IEEE Trans. Neural Networks Learn. Syst., 2019
IEEE ACM Trans. Audio Speech Lang. Process., 2019
Proceedings of the 2019 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2019
Proceedings of the 20th International Conference on Parallel and Distributed Computing, 2019
Proceedings of the 20th Annual Conference of the International Speech Communication Association, 2019
Proceedings of the 20th Annual Conference of the International Speech Communication Association, 2019
Proceedings of the 20th Annual Conference of the International Speech Communication Association, 2019
Proceedings of the IEEE International Conference on Acoustics, 2019
2018
Function Splitting and Quadratic Approximation of the Primal-Dual Method of Multipliers for Distributed Optimization Over Graphs.
IEEE Trans. Signal Inf. Process. over Networks, 2018
IEEE ACM Trans. Audio Speech Lang. Process., 2018
Multizone Soundfield Reproduction With Privacy- and Quality-Based Speech Masking Filters.
IEEE ACM Trans. Audio Speech Lang. Process., 2018
IEEE Signal Process. Lett., 2018
Neurocomputing, 2018
Proceedings of the 2018 IEEE Statistical Signal Processing Workshop, 2018
Proceedings of the 20th IEEE International Workshop on Multimedia Signal Processing, 2018
Proceedings of the 16th International Workshop on Acoustic Signal Enhancement, 2018
Proceedings of the 2018 International Conference on Image and Vision Computing New Zealand, 2018
Proceedings of the 2018 IEEE International Conference on Acoustics, 2018
On the Comparison of Two Room Compensation / Dereverberation Methods Employing Active Acoustic Boundary Absorption.
Proceedings of the 2018 IEEE International Conference on Acoustics, 2018
Proceedings of the 2018 IEEE International Conference on Acoustics, 2018
2017
IEEE ACM Trans. Audio Speech Lang. Process., 2017
IEEE ACM Trans. Audio Speech Lang. Process., 2017
Scatter Component Analysis: A Unified Framework for Domain Adaptation and Domain Generalization.
IEEE Trans. Pattern Anal. Mach. Intell., 2017
CoRR, 2017
Proceedings of the 2017 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2017
Proceedings of the 2017 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2017
Proceedings of the 2017 IEEE International Conference on Acoustics, 2017
Proceedings of the 2017 IEEE International Conference on Acoustics, 2017
Machine learning based non-intrusive quality estimation with an augmented feature set.
Proceedings of the 2017 IEEE International Conference on Acoustics, 2017
Active speech control using wave-domain processing with a linear wall of dipole secondary sources.
Proceedings of the 2017 IEEE International Conference on Acoustics, 2017
Proceedings of the 2017 IEEE International Conference on Acoustics, 2017
Proceedings of the Hands-free Speech Communications and Microphone Arrays, 2017
2016
IEEE Trans. Pattern Anal. Mach. Intell., 2016
Fast simulation method for room impulse responses based on the mirror image source assumption.
Proceedings of the IEEE International Workshop on Acoustic Signal Enhancement, 2016
Proceedings of the IEEE International Workshop on Acoustic Signal Enhancement, 2016
Proceedings of the IEEE International Workshop on Acoustic Signal Enhancement, 2016
Proceedings of the 17th Annual Conference of the International Speech Communication Association, 2016
Proceedings of the 2016 IEEE International Conference on Acoustics, 2016
Distributed sparse MVDR beamforming using the bi-alternating direction method of multipliers.
Proceedings of the 2016 IEEE International Conference on Acoustics, 2016
Jointly optimal near-end and far-end multi-microphone speech intelligibility enhancement based on mutual information.
Proceedings of the 2016 IEEE International Conference on Acoustics, 2016
Globally optimized least-squares post-filtering for microphone array speech enhancement.
Proceedings of the 2016 IEEE International Conference on Acoustics, 2016
Proceedings of the 2016 IEEE International Conference on Acoustics, 2016
Distributed linear blind source separation over wireless sensor networks with arbitrary connectivity patterns.
Proceedings of the 2016 IEEE International Conference on Acoustics, 2016
On the duality of globally constrained separable problems and its application to distributed signal processing.
Proceedings of the 24th European Signal Processing Conference, 2016
Proceedings of the Computer Vision - ECCV 2016, 2016
Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers.
Proceedings of the Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, 2016
2015
IEEE ACM Trans. Audio Speech Lang. Process., 2015
IEEE ACM Trans. Audio Speech Lang. Process., 2015
Sparse Hidden Markov Models for Speech Enhancement in Non-Stationary Noise Environments.
IEEE ACM Trans. Audio Speech Lang. Process., 2015
IEEE Signal Process. Mag., 2015
A Simple Model of Speech Communication and its Application to Intelligibility Enhancement.
IEEE Signal Process. Lett., 2015
A method of speech periodicity enhancement using transform-domain signal decomposition.
Speech Commun., 2015
Signal Process., 2015
Proceedings of the 2015 IEEE International Conference on Computer Vision, 2015
Proceedings of the 2015 IEEE International Conference on Acoustics, 2015
Sparse HMM-based speech enhancement method for stationary and non-stationary noise environments.
Proceedings of the 2015 IEEE International Conference on Acoustics, 2015
Proceedings of the 23rd European Signal Processing Conference, 2015
2014
Dirichlet mixture modeling to estimate an empirical lower bound for LSF quantization.
Signal Process., 2014
Introduction to the Special Issue on The listening talker: context-dependent speech production and perception.
Comput. Speech Lang., 2014
Proceedings of the PRICAI 2014: Trends in Artificial Intelligence, 2014
Proceedings of the 14th International Workshop on Acoustic Signal Enhancement, 2014
Proceedings of the 14th International Workshop on Acoustic Signal Enhancement, 2014
Proceedings of the IEEE International Conference on Acoustics, 2014
Proceedings of the IEEE International Conference on Acoustics, 2014
Proceedings of the IEEE International Conference on Acoustics, 2014
Proceedings of the IEEE International Conference on Acoustics, 2014
Multizone soundfield reproduction in reverberant rooms using compressed sensing techniques.
Proceedings of the IEEE International Conference on Acoustics, 2014
Proceedings of the IEEE International Conference on Acoustics, 2014
Calibration of distributed sound acquisition systems using TOA measurements from a moving acoustic source.
Proceedings of the IEEE International Conference on Acoustics, 2014
2013
IEEE Trans. Signal Process., 2013
Maximizing Phoneme Recognition Accuracy for Enhanced Speech Intelligibility in Noise.
IEEE Trans. Speech Audio Process., 2013
IEEE Trans. Speech Audio Process., 2013
Pattern Recognit. Lett., 2013
Proceedings of the IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2013
Proceedings of the 28th International Conference on Image and Vision Computing New Zealand, 2013
Proceedings of the 14th Annual Conference of the International Speech Communication Association, 2013
Proceedings of the 14th Annual Conference of the International Speech Communication Association, 2013
Proceedings of the IEEE International Conference on Acoustics, 2013
Proceedings of the IEEE International Conference on Acoustics, 2013
Proceedings of the IEEE International Conference on Acoustics, 2013
Proceedings of the IEEE International Conference on Acoustics, 2013
Proceedings of the 21st European Signal Processing Conference, 2013
2012
Optimal Index Assignment for Multiple Description Scalar Quantization With Translated Lattice Codebooks.
IEEE Trans. Signal Process., 2012
A Quantization Theoretic Perspective on Simulcast and Layered Multicast Optimization.
IEEE/ACM Trans. Netw., 2012
A Hierarchical Bayesian Approach to Modeling Heterogeneity in Speech Quality Assessment.
IEEE Trans. Speech Audio Process., 2012
Feature set augmentation for enhancing the performance of a non-intrusive quality predictor.
Proceedings of the Fourth International Workshop on Quality of Multimedia Experience, 2012
Proceedings of the IWAENC 2012 - International Workshop on Acoustic Signal Enhancement, Proceedings, RWTH Aachen University, Germany, September 4th, 2012
Proceedings of the IWAENC 2012 - International Workshop on Acoustic Signal Enhancement, Proceedings, RWTH Aachen University, Germany, September 4th, 2012
Distributed MVDR Beamforming for (Wireless) Microphone Networks Using Message Passing.
Proceedings of the IWAENC 2012 - International Workshop on Acoustic Signal Enhancement, Proceedings, RWTH Aachen University, Germany, September 4th, 2012
Proceedings of the 13th Annual Conference of the International Speech Communication Association, 2012
Proceedings of the 2012 IEEE International Conference on Acoustics, 2012
Proceedings of the 2012 IEEE International Conference on Acoustics, 2012
Gaussian process dynamical models for nonparametric speech representation and synthesis.
Proceedings of the 2012 IEEE International Conference on Acoustics, 2012
2011
Graph-Preserving Sparse Nonnegative Matrix Factorization With Application to Facial Expression Recognition.
IEEE Trans. Syst. Man Cybern. Part B, 2011
IEEE Trans. Commun., 2011
IEEE Trans. Speech Audio Process., 2011
Auditory Model-Based Design and Optimization of Feature Vectors for Automatic Speech Recognition.
IEEE Trans. Speech Audio Process., 2011
Proceedings of the IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 2011
Proceedings of the International Symposium on Intelligent Signal Processing and Communications Systems, 2011
Proceedings of the 12th Annual Conference of the International Speech Communication Association, 2011
Proceedings of the 12th Annual Conference of the International Speech Communication Association, 2011
Proceedings of the IEEE International Conference on Acoustics, 2011
Proceedings of the IEEE International Conference on Acoustics, 2011
Proceedings of the 2011 Data Compression Conference (DCC 2011), 2011
2010
Reduction of the Impact of Distortion Outliers and Source Mismatch in Resolution-Constrained Quantization.
IEEE Trans. Speech Audio Process., 2010
IEEE Signal Process. Lett., 2010
The synergy between bounded-distance HMM and spectral subtraction for robust speech recognition.
Speech Commun., 2010
Learning from images and speech with Non-negative Matrix Factorization enhanced by input space scaling.
Proceedings of the 2010 IEEE Spoken Language Technology Workshop, 2010
Complexity-outsourced low-latency video encoding through feedback under a sum-rate constraint.
Proceedings of the International Conference on Image Processing, 2010
Proceedings of the IEEE International Conference on Acoustics, 2010
Selecting static and dynamic features using an advanced auditory model for speech recognition.
Proceedings of the IEEE International Conference on Acoustics, 2010
Proceedings of the IEEE International Conference on Acoustics, 2010
Proceedings of the IEEE International Conference on Acoustics, 2010
Proceedings of the 18th European Signal Processing Conference, 2010
A method of speech periodicity enhancement based on transform-domain signal decomposition.
Proceedings of the 18th European Signal Processing Conference, 2010
Proceedings of the 18th European Signal Processing Conference, 2010
Bounding the Rate Region of Vector Gaussian Multiple Descriptions with Individual and Central Receivers.
Proceedings of the 2010 Data Compression Conference (DCC 2010), 2010
2009
IEEE Trans. Commun., 2009
IEEE Trans. Speech Audio Process., 2009
Proceedings of the 10th Annual Conference of the International Speech Communication Association, 2009
Auditory model based optimization of MFCCs improves automatic speech recognition performance.
Proceedings of the 10th Annual Conference of the International Speech Communication Association, 2009
Facial expression recognition based on graph-preserving sparse non-negative matrix factorization.
Proceedings of the International Conference on Image Processing, 2009
Proceedings of the IEEE International Conference on Acoustics, 2009
Proceedings of the IEEE International Conference on Acoustics, 2009
Proceedings of the IEEE International Conference on Acoustics, 2009
Proceedings of the IEEE International Conference on Acoustics, 2009
Proceedings of the 2009 Data Compression Conference (DCC 2009), 2009
2008
IEEE Trans. Speech Audio Process., 2008
IEEE Trans. Speech Audio Process., 2008
Proceedings of the IEEE International Conference on Acoustics, 2008
Proceedings of the IEEE International Conference on Acoustics, 2008
Proceedings of the 2008 16th European Signal Processing Conference, 2008
Proceedings of the 2008 16th European Signal Processing Conference, 2008
Proceedings of the 47th IEEE Conference on Decision and Control, 2008
2007
IEEE Trans. Inf. Theory, 2007
IEEE Trans. Speech Audio Process., 2007
IEEE Trans. Speech Audio Process., 2007
IEEE Trans. Speech Audio Process., 2007
The Sensitivity Matrix: Using Advanced Auditory Models in Speech and Audio Processing.
IEEE Trans. Speech Audio Process., 2007
Proceedings of the 8th Annual Conference of the International Speech Communication Association, 2007
Proceedings of the 8th Annual Conference of the International Speech Communication Association, 2007
Proceedings of the 8th Annual Conference of the International Speech Communication Association, 2007
Proceedings of the International Conference on Image Processing, 2007
Proceedings of the IEEE International Conference on Acoustics, 2007
Proceedings of the IEEE International Conference on Acoustics, 2007
2006
Comparative rate-distortion performance of multiple description coding for real-time audiovisual communication over the Internet.
IEEE Trans. Commun., 2006
IEEE Trans. Speech Audio Process., 2006
IEEE Trans. Speech Audio Process., 2006
IEEE Trans. Speech Audio Process., 2006
IEEE Trans. Speech Audio Process., 2006
IEEE Signal Process. Lett., 2006
Individual on-line variance adaptation of frequency filtered parameters for robust ASR.
Proceedings of the Ninth International Conference on Spoken Language Processing, 2006
Proceedings of the Ninth International Conference on Spoken Language Processing, 2006
Proceedings of the 2006 IEEE International Conference on Acoustics Speech and Signal Processing, 2006
Proceedings of the 2006 IEEE International Conference on Acoustics Speech and Signal Processing, 2006
Proceedings of the 2006 IEEE International Conference on Acoustics Speech and Signal Processing, 2006
2005
IEEE Trans. Speech Audio Process., 2005
IEEE Signal Process. Lett., 2005
EURASIP J. Adv. Signal Process., 2005
Proceedings of the Nonlinear Analyses and Algorithms for Speech Processing, 2005
Proceedings of the Nonlinear Analyses and Algorithms for Speech Processing, 2005
Proceedings of the 9th European Conference on Speech Communication and Technology, 2005
Proceedings of the 9th European Conference on Speech Communication and Technology, 2005
Proceedings of the 9th European Conference on Speech Communication and Technology, 2005
Proceedings of the 2005 IEEE International Conference on Acoustics, 2005
Stochastic Integration and Long Term Predictor Estimation under Noisy Conditions for Speech Enhancement.
Proceedings of the 2005 IEEE International Conference on Acoustics, 2005
Proceedings of the 2005 IEEE International Conference on Acoustics, 2005
2004
IEEE Trans. Speech Audio Process., 2004
IEEE Trans. Speech Audio Process., 2004
Proceedings of the 8th International Conference on Spoken Language Processing, 2004
Comparison of transmitter - based packet-loss recovery techniques for voice transmission.
Proceedings of the 8th International Conference on Spoken Language Processing, 2004
Proceedings of the 2004 IEEE International Conference on Acoustics, 2004
Estimation of short-term predictor parameters for coding and enhancement of noisy speech.
Proceedings of the 2004 IEEE International Conference on Acoustics, 2004
Proceedings of the 2004 IEEE International Conference on Acoustics, 2004
Proceedings of the 2004 IEEE International Conference on Acoustics, 2004
Multiple-description vector quantization using translated lattices with local optimization [joint source/channel coding].
Proceedings of the Global Telecommunications Conference, 2004. GLOBECOM '04, Dallas, Texas, USA, 29 November, 2004
Proceedings of the 2004 12th European Signal Processing Conference, 2004
Proceedings of the 2004 12th European Signal Processing Conference, 2004
Proceedings of the 2004 12th European Signal Processing Conference, 2004
Proceedings of the 2004 12th European Signal Processing Conference, 2004
2003
Proceedings of the Third International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications, 2003
Proceedings of the 8th European Conference on Speech Communication and Technology, EUROSPEECH 2003, 2003
Proceedings of the 8th European Conference on Speech Communication and Technology, EUROSPEECH 2003, 2003
Proceedings of the 11th IEEE International Conference on Networks, 2003
Minimum mean square error estimation of speech short-term predictor parameters under noisy conditions.
Proceedings of the 2003 IEEE International Conference on Acoustics, 2003
2002
IEEE Signal Process. Lett., 2002
Proceedings of the 7th International Conference on Spoken Language Processing, ICSLP2002, 2002
Proceedings of the IEEE International Conference on Acoustics, 2002
Gaussian mixture model based mutual information estimation between frequency bands in speech.
Proceedings of the IEEE International Conference on Acoustics, 2002
Proceedings of the IEEE International Conference on Acoustics, 2002
Proceedings of the IEEE International Conference on Acoustics, 2002
A time domain reformulation of linear prediction equivalent to the LSP decomposition.
Proceedings of the IEEE International Conference on Acoustics, 2002
Proceedings of the 11th European Signal Processing Conference, 2002
Proceedings of the 11th European Signal Processing Conference, 2002
2001
Proceedings of the EUROSPEECH 2001 Scandinavia, 2001
Proceedings of the IEEE International Conference on Acoustics, 2001
Proceedings of the IEEE International Conference on Acoustics, 2001
Estimation of the excitation variances of speech and noise AR-models for enhanced speech coding.
Proceedings of the IEEE International Conference on Acoustics, 2001
Proceedings of the IEEE International Conference on Acoustics, 2001
Sinusoidal modeling of audio and speech using psychoacoustic-adaptive matching pursuits.
Proceedings of the IEEE International Conference on Acoustics, 2001
2000
Proceedings of the IEEE International Conference on Acoustics, 2000
Proceedings of the IEEE International Conference on Acoustics, 2000
Proceedings of the IEEE International Conference on Acoustics, 2000
Proceedings of the 10th European Signal Processing Conference, 2000
1999
Proceedings of the 1999 IEEE International Conference on Acoustics, 1999
Proceedings of the 1999 IEEE International Conference on Acoustics, 1999
1998
Proceedings of the 5th International Conference on Spoken Language Processing, Incorporating The 7th Australian International Speech Science and Technology Conference, Sydney Convention Centre, Sydney, Australia, 30th November, 1998
Proceedings of the 5th International Conference on Spoken Language Processing, Incorporating The 7th Australian International Speech Science and Technology Conference, Sydney Convention Centre, Sydney, Australia, 30th November, 1998
Proceedings of the 1998 IEEE International Conference on Acoustics, 1998
1997
Proceedings of the Fifth European Conference on Speech Communication and Technology, 1997
Proceedings of the 1997 IEEE International Conference on Acoustics, 1997
Proceedings of the 1997 IEEE International Conference on Acoustics, 1997
Proceedings of the 1997 IEEE International Conference on Acoustics, 1997
1996
Proceedings of the 1996 IEEE International Conference on Acoustics, 1996
1995
Proceedings of the 1995 International Conference on Acoustics, 1995
Proceedings of the 1995 International Conference on Acoustics, 1995
1994
Interpolation of the pitch-predictor parameters in analysis-by-synthesis speech coders.
IEEE Trans. Speech Audio Process., 1994
On the periodicity of speech coded with linear-prediction based analysis by synthesis coders.
IEEE Trans. Speech Audio Process., 1994
IEEE Signal Process. Lett., 1994
Proceedings of ICASSP '94: IEEE International Conference on Acoustics, 1994
1993
Proceedings of the IEEE International Conference on Acoustics, 1993
1992
Proceedings of the 1992 IEEE International Conference on Acoustics, 1992
1991
Proceedings of the 1991 International Conference on Acoustics, 1991
Proceedings of the 1991 International Conference on Acoustics, 1991
1990
IEEE Trans. Acoust. Speech Signal Process., 1990
Proceedings of the 1990 International Conference on Acoustics, 1990
1989
Proceedings of the IEEE International Conference on Acoustics, 1989
1988
An efficient stochastically excited linear predictive coding algorithm for high quality low bit rate transmission of speech.
Speech Commun., 1988
Proceedings of the IEEE International Conference on Acoustics, 1988
1987
Proceedings of the IEEE International Conference on Acoustics, 1987