Dologlou, Ioannis
PROFILE

Ioannis Dologlou

Personal Information

Position: Research Director
Phone or fax: +30 210 6875306

Areas of interest

  • Speech and language processing
  • SVD based spectral estimation

CV data

Ioannis Dologlou received his M.S. degree in Electrical Eng. from the National Technical University of Athens (NTUA) in 1981 and the Ph.D. degree from the Institut National Polytechnique of Grenoble in 1984.From 1984 until 1986 he was a postdoctoral fellow at UC Santa Barbara and from 1986 until 1988 he worked as research assistant at Imperial College London. From 1989 until 1991 he was research fellow at NTUA and consultant for the European project in automatic translation EUROTRA-EL. During 1992 he was visiting professor at the University of Paris-Orsay and Paris-Nord and from 1993 until 1994 he was Research Director at the French CNRS. In 1995 and 1996 he was research scientist at the Technical University of Delft and at the Katholieke University of Leuven respectively.

From October 1996 until November 1998 he was the head of the speech group of the EE Dept. of the Katholieke University of Leuven.

Since March 1999 he is a senior researcher at the Institute for Language and Speech Processing (ILSP).

His research interests are in speech and language processing and SVD based spectral estimation and he has over 100 publications in scientific journals and conferences in these fields.

Publications

  • Dologlou, I. & Bakamidis, S. (2017). Phonetic Search in Audio and Video Recordings. Digital Humanities, 12. [...] 
  • Athanaselis, T., Bakamidis, S., Dologlou, I., Evmorfia N Argyriou & Antonis Symvonis. (2014). Making assistive reading tools user friendly: a new platform for Greek dyslexic students empowered by automatic speech recognition. Multimedia tools and applications, 68(3), 681-699. [...] 
  • Dologlou, I. & Bakamidis, S. (2014). Multiresolution image compression using non linear transformations. In Proceedings of IPCV 2014, pages 407-411. Las Vegas, USA. [...] 
  • Tambouratzis, G., Tsatsanifos, G., Dologlou, I. & Tsimboukakis N. (2012). SOM-based corpus modeling for disambiguation purposes in MT. In MTW-2012- Hybrid Machine Translation, Proceedings of the Workshop on Hybrid Machine Translation, held within the TSD-2012 Conference, pages pp.29-36. Brno, Czech Republic : Tribun EU & Springer. [...] 
  • Fotinea, S., Dologlou, I., Bakamidis, S. & Athanaselis, T. (2012). Decimative Spectral Estimation with Unconstrained Model Order. Computational and Mathematical Methods in Medicine, 2012. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I (2011). Performance Evaluation of a novel technique for word order errors correction applied to non native English speakers' corpus. Lecture Notes in Computer Science series edited by Springer (CICLing 2011). [...] 
  • Athanaselis, T., Mamouras, K., Bakamidis, S. & Dologlou, I. (2011). A Corpus Based Technique For Repairing Ill-Formed Sentences With Word Order Errors Using Co-Occurences Of N-Grams. International Journal on Artificial Intelligence Tools. [...] 
  • Athanaselis, T., Bakamidis, S., Dologlou, I. & Fotinea, S. (2010). Enhancing Speech Recognition performance in the presence of MRI scanner noise. International Journal of Signal and Imaging Systems Engineering (IJSISE), 3(3), 179-187. [...] 
  • Guimaraes, R., Athanaselis, T., Bakamidis, S., Dologlou, I. & Fotinea, S. (2010). A vocal user Interface Plug-in for jMRUI. In Proceedings of the IEEE International Workshop on Imaging systems and techniques (IST 2010), pages 384-388. thessaloniki, Greece. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2009). Reducing the cocktail party effect prior to Automatic Speech recognition. In Proceedings of the 13-th International Conference Speech and Computer (SPECOM), pages 360-363. [...] 
  • Athanaselis, T., Bakamidis, S., Dologlou, I. & Fotinea, S. (2009). Impact of MRI scanner noise on Speech Recognition confidence score. In Proceedings of the 4rd Language & Technology Conference: Human Language Technologies as a Challenge for Computer Science and Linguistics. [...] 
  • Athanaselis, T., Mamouras, K., Bakamidis, S. & Dologlou, I (2008). Sentence-level Evaluation Using Co-occurences of N-grams. Lecture Notes in Computer Science. Berlin/Heidelberg : Springer-Verlag. [...] 
  • Athanaselis, T., Bakamidis, S., Giannopoulos, G., Dologlou, I. & Fotinea, S. (2008). Robust Speech Recognition in the presence of noise using medical data. In Proceedings of the IEEE International Workshop on Imaging systems and techniques (IST), pages 349-353. Chania, Greece. [...] 
  • Athanaselis, T., Mamouras, K., Bakamidis, S. & Dologlou, I. (2007). User Evaluation of a novel technique for word-order error correction. In Proceedings of the 3rd Language & Technology Conference: Human Language Technologies as a Challenge for Computer Science and Linguistics. Poznan, Poland. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2007). Evaluating ASR confidence score performance in different noisy conditions. In Proceedings of the 12-th International Conference Speech and Computer (SPECOM), pages 207-211. Moscow. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2007). A novel technique for words reordering based on n-grams. In Proceedings of the International Symposium on Signal Processing and its Applications in conjunction with the International Conference on Information Sciences, Signal Processing and its Applications. Sharjah, United Arab Emirates (U.A.E.). [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). Recognising verbal content of emotionally coloured speech. In Proceedings of the 14th European Signal Processing Conference (EUSIPCO). Florence, Italy. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). Words Reordering based on Statistical Language Model. In Proceedings of the Transactions on Engineering, Computing and Technology, pages 270-273. Vienna, Austria. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). Recognising Verbal Content of Emotionally Coloured Speech. In Proceedings of the Transactions on Engineering, Computing and Technology, pages 274-277. Vienna, Austria. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). Impact of the cocktail party effect on the confidence accuracy of emotional speech recogniser. In Proceedings of the 18th BeNeLux Conference on Artificial Intelligence , (BNAIC). Namour, Belgium. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). An automatic method for revising ill-formed sentences based on N-grams. In Proceedings of the 3rd International conference on Speech Prosody, pages 370-373. Dresden, Germany. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). A Statistical Method for Correcting Word Order Errors in Greek Texts. In Proceedings of the 2nd international conference of IASTED on Computational Intelligence (CI), pages 502-506. San Francisco. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). A New Approach for Words Reordering Based On Statistical Language Model. In. [...] 
  • Athanaselis, T., Bakamidis, S., Dologlou, I. & Mamouras, K. (2006). N-grams: A Tool for Repairing Word Order Errors in ill-formed Texts. International Journal of Signal Processing, 3(2), 123-128. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2006). A comparative study of ASR performance in different emotional states. In Proceedings of the XXVIII-th International Congress of Audiology, pages 98-102. Innsbruck, Austria. [...] 
  • Fotinea, S., Dologlou, I. & Carayannis, G (2006). On the use of decimation for efficient spectral estimation. In Lipitakis & E. (editors), International Journal of Computer Mathematics and its Applications (HERMIS-μπ). [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I (2006). A Fast Algorithm for Words Reordering Based on Language Model. Lecture Notes in Computer Science. Heidelberg : Springer-Verlag. [...] 
  • Karabetsos, S., Tsiakoulis, P., Fotinea, S. & Dologlou, I. (2006). Formant Estimation of Speech Signals Using Subspace-Based Spectral Analysis. In Proc. EUSIPCO 2006 (14th European Signal Processing Conference). Florence, Italy. [...] 
  • Athanaselis, T., Bakamidis, S. & Dologlou, I. (2005). Improving speech recognition performance in noisy environments. In Proceedings of the 7th Hellenic-European Conference on Computer Mathematics and its Applications (HERCMA'2005). Athens, Greece. [...] 
  • Athanaselis, T., Bakamidis, S., Dologlou, I., Cowie, R., Douglas-Cowie, E. & Cox, C. (2005). ASR for emotional speech: clarifying the issues and enhancing performance. Neural Networks Elsevier Publications, 18(4), 437- 444. [...] 
  • Tsiakoulis, P., Karabetsos, S., Fotinea, S. & Dologlou, I. (2005). Spectral Estimation for Speech Signals based on Decimation and Eigenanalysis. In Proc. HERCMA-2005 (7th Hellenic European Conf. on Computer Mathematics & its Applications). Athens, Greece. [...] 
  • Karabetsos, S., Tsiakoulis, P., Fotinea, S. & Dologlou, I. (2005). On the Use of a Decimative Spectral Estimation Method based on Eigenanalysis and SVD for Formant and Bandwidth Tracking of Speech Signals. In Interspeech’2005: 9th European Conference on Speech Communication and Technology, pages 709-712. Lisbon, Portugal. [...] 
  • Dologlou, I., Bakamidis, S., Fotinea, S. & Carayannis, G. (2004). A new multi-resolution image compression system based on subband and binary coding. In Proc. of the 1st International Conference "From Scientific Computing to Computational Engineering" (IC-SCCE), Invited Session on Human Computer Interaction, pages 842-847. Athens, Greece. [...] 
  • Dologlou, I. & Bakamidis, S. (2004). Device for statistical machine translation using monolingual text corpora . [...] 
  • Athanaselis, T., Bakamidis, S., Fotinea, S. & Dologlou, I. (2004). Impact of Speech Enhancement on ASR time stamping. In Proceedings of the Fourth European Symposium on Intelligent Technologies, Hybrid Systems and their implementation on Smart Adaptive Systems, EUNITE-2004, pages 452-457. Aachen, Germany. [...] 
  • Athanaselis, T., Bakamidis, S., Fotinea, S., Dologlou, I., Fragapanagos, N. & Taylor, J. (2003). Impact of Speech Enhancement on ASR Confidence Score. In. [...] 
  • Fragapanagos, N., Taylor, J., Cowie, R., Douglas-Cowie, E., Athanaselis, T., Bakamidis, S. et al. (2003). Detecting Moving Emotion. In Proceedings of EUNITE 2003, pages 542 – 547. Oulu, Finland. [...] 
  • Fotinea, S., Dologlou, I. & Carayannis, G (2003). Αποδεκατισμός και ανάλυση ιδιαζουσών τιμών για την εκτίμηση των παραμέτρων εκθετικά αποσβεννύμενων ημιτόνων στην ποσοτική ανάλυση φασμάτων NMR. In Nikita & K. (editors), Περιοδικό ΠΥΡΦΟΡΟΣ. NTUA press. [...] 
  • Athanaselis, T., Fotinea, S., Bakamidis, S., Dologlou, I. & Giannopoulos, G (2003). Signal Enhancement for Continuous Speech Recognition. In O. Kaynak et al. (editor), Lecture Notes in Computer Science (LNCS). Berlin Heidelberg : Springer-Verlag. [...] 
  • Fotinea, S., Bakamidis, S., Athanaselis, T., Dologlou, I., Vacalopoulou, A., Cowie, R. et al (2003). Emotion in Speech: towards an integration of linguistic, paralinguistic and psychological analysis. In O. Kaynak et al. (editor), Lecture Notes in Computer Science (LNCS). Berlin Heidelberg : Springer-Verlag. [...] 
  • Dologlou, I., Markantonatou, S., Tambouratzis, G., Yannoutsou, O., Fourla, . & Ioannou, N. (2003). Using Monolingual Corpora for Statistical Machine Translation: The METIS System. In Proceedings of the EAMT-CLAW 03: Controlled Language Translation, pages 61-68. Dublin, Ireland. [...] 
  • Fotinea, S., Dologlou, I. & Carayannis, G (2002). A new decimative spectral estimation method with unconstrained model order and decimation factor. In Fotinea S-E., Dologlou, I., Carayannis & G. (editors), Total Least Squares and Errors-in-Variables Modeling: Analysis, Algorithms and Applications. Kluwer Academic Publishers. [...] 
  • Tambouratzis, G., Bakamidis, S., Dologlou, I., Carayannis, G. & Dendrinos, M. (2002). The IMUTUS Interactive Music Tuition System. In Acoustical Society of America Journal, pages 2348. [...] 
  • Fotinea, S., Dologlou, I. & Carayannis, G. (2001). Detailed results for the work presented in 'Decimative Spectral Estimation based on the eigenanalysis of Hankel matrices'. Athens, ILSP. [...] 
  • Dendrinos, M., Bakamidis, S., Dologlou, I. & Carayannis, G. (2001). Single Channel SVD Based Noise Reduction Techniques. In 4th European Conference on Noise Control EURONOISE 2001. Patra, Greece. [...] 
  • Kyriakou, C., Bakamidis, S., Dologlou, I. & Carayannis, G. (2001). Robust Continuous Speech Recognition in the Presence of Coloured Noise. In 4th European Conference on Noise Control, EURONOISE 2001. Patra, Greece. [...] 
  • Fotinea, S., Dologlou, I. & Carayannis, G. (2001). Decimation and SVD to estimate exponentially damped sinusoids in the presence of noise. In Proc. of IEEE International Conference on Acoustics, Speech, and Signal Processing ICASSP-2001, pages 3073-3076. Salt Lake City, Utah, USA. [...] 
  • Fotinea, S., Dologlou, I., Bakamidis, S., Stainhaouer, G. & Carayannis, G. (2000). Perceptual evaluation of a new subband low bit rate speech compression system based on waveform Vector Quantization and SVD postfiltering. In Proc. of the Second International Conference on Language Resources and Evaluation - LREC 2000, pages 1337-1341. Athens, Greece. [...] 
  • Dologlou, I., Bakamidis, S. & Carayannis, G. (2000). A New Algorithm to Design Optimal Hidden Markov Models. In X European Signal Processing Conference, EUSIPCO 2000. Tampere, Finland. [...] 
  • Fotinea, S., Dologlou, I., Hatzigeorgiu, N. & Carayannis, G. (2000). Spectral Estimation Based on the eigenanalysis of companion-like matrices. In ICASSP 2000 proceedings, pages 257-260. Istanbul, Turkey. [...] 
  • Hermus, K., Dologlou, I., Wambacq, P. & Van Compernolle, D. (1999). Fully Adaptive SVD-based Noise Removal for Robust Speech Recognition. In Eurospeech 1999. [...] 
  • Xu, W., Duchateau, J., Dologlou, I., Wambacq, P., Van Compernolle, D. & Van Hamme, H. (1999). Accuracy Versus Complexity in Context Dependent Phone Modeling. In Eurospeech 1999. [...] 
  • Sundin, T., Vanhamme, L., Van Hecke,  ., Dologlou, I. & Van Huffel, S. (1999). Accurate quantification of 1H spectra: from finite impulse response filter design for solvent suppression to parameter estimation. Journal of Magnetic Resonance, 139. [...] 
  • Lemmerling, P., Dologlou, I. & Van Huffel, S. (1998). Variable Rate Speech Compression Based on Exact Modelling and Waveform Vector Quantization. In Signal Processing Symposium SPS 98. Leuven, Belgium. [...] 
  • Lemmerling, P., Dologlou, I. & Van Huffel, S. (1998). Speech Compression Based on Exact Modeling and Structured Total Least Norm. In ICASSP-98. Seattle, USA.. [...] 
  • Dologlou, I., Claes, T., Ten Bosch, L., Van Compernolle, D. & Van Hamme, H. (1998). Speaker Normalization for Automatic Speech Recognition - An on-line Approach. In EUSIPCO. Rhodes Greece. [...] 
  • Doclo, S., Dologlou, I. & Moonen, M. (1998). A novel iterative signal enhancement algorithm for noise reduction in speech. In ICSLP-98. Sydney, Australia. [...] 
  • Xu, W., Duchateau, J., Demuynck, K. & Dologlou, I. (1998). A New Approach to Merging Gaussian Densities in Large Vocabulary Continuous Speech Recognition. In Signal Processing Symposium SPS 98. Leuven, Belgium. [...] 
  • Dologlou, I., Van Huffel, S. & Van Ormondt, D. (1998). Metabolite Selective MRS Data Quantification with Frequency Prior Knowledge. Journal of Magnetic Resonance, 130. [...] 
  • Claes, T., Dologlou, I., Ten Bosch, L. & Van Compernolle, D. (1998). A Novel Features Transformation for Vocal Tract Length Normalization in Automatic Speech Recognition. IEEE Transaction on Speech and Audio Processing, 6(6), 549-557. [...] 
  • Dologlou, I., Claes, T., Ten Bosch, L. & Van Compernolle, D. (1997). New Transformations for Cepstral Parameters for Automatic Vocal Tract Length Normalization in Speech Recognition. In Eurospeech. [...] 
  • Totz, J., Van den Boogaart, A., Van Huffel, S., Graveron, D., Dologlou, I., Heidler, R. et al. (1997). The Use of Continuous Regularization in the Automated Analysis of MRS Time Domain Data. Journal of Magnetic Resonnance. [...] 
  • Dologlou, I., Van Huffel, S. & Van Ormondt, D. (1997). Improved Signal Enhancement Procedures Applied to Exponential Data Modeling. IEEE Transaction on SP, 45, 799-803. [...] 
  • Skowronski, J. & Dologlou, I. (1997). Image Compression Using Permutative Vector Quantization. Image Communication, 11(1). [...] 
  • Teodorescu, R., Van Compernolle, D. & Dologlou, I. (1997). A Modular Initialization Scheme for Better Speech Recognition Performance Using Hybrid Systems of MLP's/HMM's. In Eurospeech. [...] 
  • Dologlou, I. (1996). Spiral MRI Scan-Time Reduction through Nonuniform Angular Distribution of Interleaves and Multichannel SVD Interpolation. In International Society for Magnetic Resonance in Medicine. [...] 
  • Dologlou, I. & Van Huffel, S. (1996). Improved Exponential Data Modeling with Frequency Prior-Knowledge. In International Conference on Mathematics in Signal Processing,. [...] 
  • Dologlou, I., Carayannis, G. & Bakamidis, S. (1996). Signal Decomposition in Terms of Non-Orthogonal Sinusoidal Bases. Signal Processing, 51. [...] 
  • Dologlou, I., Bakamidis, S. & Carayannis, G. (1996). Signal Decomposition in Terms of Non-Orthogonal Bases. European Signal Processing Journal, 51, 79-91. [...] 
  • Dologlou, I., Pesquet, J. & Skowronski, Y. (1996). Projection Based Rank Reduction Algorithms for Multichannel Modelling and Image Compression. Signal Processing, 48, 97-109. [...] 
  • Dologlou, I., Van Ormondt, D. & Carayannis, G. (1996). MRI Scan Time Reduction through non Uniform Sampling and SVD-Based Estimation. Signal Processing, 55, 207-219. [...] 
  • Chretien, S. & Dologlou, I. (1995). Successive Projections-Like Algorithms for Signal Approximation/Zero-Error Modelling. In International  Conference on Acoustic Speech and Signal Processing. Detroit USA. [...] 
  • Skowronski, J. & Dologlou, I. (1995). Permutative Vector Quantization-Application to Image Compression. In International Conference on Acoustic Speech and Signal Processing. Detroit USA. [...] 
  • Dologlou, I., Stathaki & Carayannis, G. (1995). Numerical Stability of All Pole Models. In International Conference on Digital Signal Processing. Limassol, Cyprus. [...] 
  • Skowronski, Y. & Dologlou, I. (1995). Compression d'images au moyen d'une modelisation par sinusoides exponentielles. In 15eme Colloque GRETSI. New York, USA. [...] 
  • Skowronski, J. & Dologlou, I. (1994). Two Dimensional Zero Error Modelling for Image Compression. In 3rd International Workshop on SVD and Signal Processing. Leuve, Belgium. [...] 
  • Chretien, S. & Dologlou, I. (1994). Image Compression Based on Reduced Rank Approximation and Adaptive Error Modelling. In EUSIPCO. Edinburgh. [...] 
  • Dologlou, I. (1994). Une Nouvelle Technique de Compression d' Images. La Recherche, 18. [...] 
  • Dologlou, I., Eskenazi, M., Ouayoun, M. & Frachet, B. (1993). Selective Information Reduction for Cochlear Implants. In 1st TIDE Congress. Brussels. [...] 
  • Dologlou, I., Pesquet, J. & Carayannis, G. (1993). Analyse Multidimentionnelle a l' aide d un Nouveau Modele Multicanal et d' un Algorithme de Projections Successives. Application a l' Analyse d' Images. In 14eme Colloque GRETSI, pages 61-64. [...] 
  • Dologlou, I. & Pesquet, J. (1993). Codage Numerique et Compression d' Images. CNRS-Info, 8-9. [...] 
  • Frachet, B., Dologlou, I., Van Den Abbeele, T. & Ormezzano, Y. (1993). Fast Electrical Brainstem Evoked Potentials in Cochlear Implanted Patients. In 3rd International Cochlear Implant Conference. Innsbruck. [...] 
  • Dologlou, I. & Carayannis, G. (1991). Zero Modeling Error (ZME) at the Meeting Point of LPC and SVD Analysis. In International Conference on Acoustic Speech and Signal Processing, pages 3397-3399. Toronto, Canada. [...] 
  • Carayannis, G., Koukoutsis, E. & Dologlou, I. (1991). LPC/SVD Parallel Toeplitz Solvers. In International Symposium on Parallel and Distributed Computing in Engineering Systems. Corfu Greece. [...] 
  • Dologlou, I., Malnati, G. & Paggio, P. (1991). A Preference Mechanism Based on Multiple Criteria Resolution. In Proceedings of 5th European ACL Conference. Berlin. [...] 
  • Nandi, A., Aburdene, M., Constantinides, A. & Dologlou, I. (1991). Variation  of  vector quantization and speech waveform coding. IEE Proceedings-I, 138(2), 76-80. [...] 
  • Dologlou, I., Carayannis, G. & Touratzidis, L. (1991). The Eigenproblem Formulation for HMM. Speech  Communication, 10(4), 373-380. [...] 
  • Dologlou, I. & Carayannis, G. (1991). Physical interpretation of signal reconstruction from reduced rank matrices. IEEE Transactions on Acoustics Speech and Signal Processing, ASSP, 1681-1682. [...] 
  • Dologlou, I. & Carayannis, G. (1991). A Reply to : Some Remarks on the Halting Criterion for Iterative Low-Pass Filtering in a  Recently Proposed  Pitch Detection Algorithm. Speech  Communication, 10, 227-228. [...] 
  • Dologlou, I. & Carayannis, G. (1991). LPC/SVD analysis of signals with zero modeling error. Signal Processing, 23, 293-298. [...] 
  • Dologlou, I. & Carayannis, G. (1990). Image coding based on a new perspective in the frequency analysis of a signal in terms of exponential functions. In Picture Coding Simposium, pages 10.1.1-10.1.3. Cambridge, Massachusetts, USA. [...] 
  • Dologlou, I. & Carayannis, G. (1989). Pitch detection based on zero phase filtering. Speech Communication, 8(4), 309-318. [...] 
  • Nandi, A., Aburdene, M., Constantinides, A. & Dologlou, I. (1988). A new idea in the coding of speech waveform using  vector  quantization  and  a  solution  to the matching problem in L-infinity norm. In Proceedings of Digital Signal Processing Workshop. Tahoe CA, U.S.A. [...] 
  • Dologlou, I. & Gersho, A. (1987). A vector companding technique for fast codebook search in waveform coding of speech. In European Conference on Circuit Theory and Design, pages 133-138. [...] 
  • Dologlou, I. & Dolmazon, J. (1984). Comparison of a model of the peripheral auditory system and LPC analysis in a speech  recognition  system. In International  Conference  on Acoustic Speech and Signal Processing, pages 17.10.1-17.10.4. San Diego. [...] 
  • Dologlou, I. & Dolmazon, J. (1984). Procede de Reconnaissance de la Parole. French Patent. [...] 
  • Dologlou, I., Halkias, C., Carayannis, G. & Emmanoulopoulos, D. (1982). A new generalized recursion for the fast computation of the  kalman gain to solve the covariance equations. In International Conference on Acoustics Speech and Signal Processing, pages 1760-1763. Paris. [...] 

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