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Publications

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Books

·         M. Rayner, D. Carter, P. Bouillon, V. Digalakis, M. Wiren (Editors)

“The Spoken Language Translator”, Cambridge Univerity Press, June 2000.

Book Chapters

·         M. Rayner, D. Carter, P. Bouillon, V. Digalakis, M. Wiren,
“The Spoken Language Translator,”
Spoken Language Translator, Cambridge University Press, June 2000.

·         V. Digalakis and H. Franco,
“Speech Recognition,”
Spoken Language Translator, Cambridge University Press, June 2000.

·         V. Digalakis and L. Neumeyer,
“Acoustic Modeling,”
Spoken Language Translator, Cambridge University Press, June 2000.

·         R. Eklund, J. Kaja, L. Neumeyer, V. Digalakis,
“Porting a Recognizer to a New Language,”
Spoken Language Translator, Cambridge University Press, June 2000.

·         V. Digalakis and L. Neumeyer,
“Multiple Languages and Dialects,”
Spoken Language Translator, Cambridge University Press, June 2000.

·         M. Rayner, D. Carter, P. Bouillon, V. Digalakis, M. Wiren,
“Conclusions,” Spoken Language Translator, Cambridge University Press, June 2000.

Journal Publications

·         V. Digalakis, M. Ostendorf and J. R. Rohlicek.
Fast Algorithms for Phone Classification and Recognition Using Segment-Based Models.
IEEE Transactions Signal Processing, December 1992, pp. 2885-2896.

·         V. Digalakis, J. R. Rohlicek, M. Ostendorf.
ML Estimation of a Stochastic Linear System with the EM Algorithm and its Application to Speech Recognition.
IEEE Transactions Speech and Audio Processing, October 1993, pp. 431-442.

·         V. Digalakis, V. K. Ingle, D. G. Manolakis.
Multidimensional Linear Prediction and its Application to Digital Angiography.
Multidimensional Systems and Signal Processing, Vol. 4, 1993, pp.307-329.

·         L. Neumeyer, V. Digalakis and M. Weintraub.
Training Issues and Channel Equalization Techniques for the Construction of Telephone Acoustic Models Using a High-Quality Speech Corpus.
IEEE Transactions Speech and Audio Processing, October 1994, pp. 590-597.

·         V. Digalakis, D. Rtischev and L. Neumeyer.
Speaker Adaptation Using Constrained Reestimation of Gaussian Mixtures.
IEEE Transactions Speech and Audio Processing, September 1995, pp. 357-366.

·         V. Digalakis, P. Monaco and H. Murveit.
Genones: Generalized Mixture Tying in Continuous Hidden Markov Model-Based Speech Recognizers.
IEEE Transactions Speech and Audio Processing, July 1996, pp. 281-289.

·         V. Digalakis and L. Neumeyer.
Speaker Adaptation Using Combined Transformation and Bayesian Methods.
IEEE Transactions Speech and Audio Processing, July 1996, pp. 294-300.

·         M. Ostendorf, V. Digalakis and O. Kimball.
From HMMs to Segment Models: A Unified View of Stochastic Modeling for Speech Recognition.
IEEE Transactions Speech and Audio Processing, September 1996, pp. 360-378.
1999 IEEE Signal Processing Society Best Paper Award

·         V. Digalakis, L. Neumeyer and M. Perakakis.
Quantization of Cepstral Parameters for Speech Recognition over the World Wide Web.
IEEE Journal on Selected Areas in Communications, January 1999, pp. 82-90.

·         V. Digalakis.
On-line Adaptation of Hidden Markov Models Using Incremental Estimation Algorithms.
IEEE Transactions Speech and Audio Processing, May 1999, pp.253-261.

·         V. Diakoloukas and V. Digalakis.
Maximum-Likelihood Stochastic-Transformation Adaptation of Hidden Markov Models.
IEEE Transactions Speech and Audio Processing, March 1999, pp.177-187.
2000 IEEE Signal Processing Society Young Author Best Paper Award

·         V. Digalakis, S. Tsakalidis, C. Harizakis and L. Neumeyer.
Efficient Speech Recognition Using Subvector Quantization and Discrete Mixture HMMs.
Computer Speech and Language, January 2000, pp.33-46.

·         L. Neumeyer, H. Franco, V. Digalakis and M. Weintraub.
Automatic Pronunciation Scoring of Foreign Language Student Speech.
Speech Communication, February 2000, pp.83-93.

·         H. Franco, L. Neumeyer, V. Digalakis and O. Ronen.
Combination of Machine Scores for Automatic Grading of Pronunciation Quality.
Speech Communication, February 2000, pp.121-130.

·         P. Stogiannos, A. Dollas and V. Digalakis.
A Configurable Logic Based Architecture for Real-Time Continuous Speech Recognition Using Hidden Markov Models.
Journal of VLSI Signal Processing Systems, March 2000, pp.1-18.

·         C. Boulis, V. Diakoloukas, V. Digalakis.
Maximum Likelihood Stochastic Transformations Adaptation for Medium and Small Data Sets.
Computer Speech and Language, July 2001, pp. 257-287.

·         N. Moustroufas and V. Digalakis.
Automatic pronunciation evaluation of foreign speakers using unknown text.
Computer, Speech and Language, January 2007.

·         N. Chatzichrisafis, V.Diakoloukas, V. Digalakis and  C. Harizakis.
Gaussian Mixture Clustering and Language Adaptation for the Development of a New Language Speech Recognition System.
IEEE Transactions on Speech and Audio Processing, Vol. 15, No. 3, March 2007, pp. 928 – 938.

 

Conference Publications:

·         M. Ostendorf and V. Digalakis.
The Stochastic Segment Model for Continuous Speech Recognition.
Proceedings of Twenty-fifth Asilomar Conference on Signals, Systems and Computers, Asilomar, California, November 1991, pp. 964-968 (Invited Paper).

·         V.Digalakis.
Maximum Likelihood Identification of a Dynamical System Model for Speech Using the EM Algorithm.
Proceedings of the IEEE International Symposium on Information Theory, Budapest, Hungary, June 1991, pp. 134.

·         V. Digalakis, J. R. Rohlicek, M. Ostendorf.
A Dynamical System Approach to Continuous Speech Recognition.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Toronto, Canada, May 1991, pp. 289-292.

·         V. Digalakis, M. Ostendorf, J. R. Rohlicek.
Fast Search Algorithms for Connected Phone Recognition Using the Stochastic Segment Model.
Proceedings of the DARPA Speech and Natural Language Workshop, June 1990, pp. 173-178.

·         V. Digalakis, M. Ostendorf and J.R. Rohlicek.
Improvements in the Stochastic Segment Model for Phoneme Recognition.
Proceedings of the DARPA Speech and Natural Language Workshop, Cape Cod, Massachusetts, October 1989, pp. 332-338.

·         V. Digalakis and V. K. Ingle.
A New Three-Dimensional Linear Predictive Algorithm for Digital Subtraction Angiography.
Proceedings of Fifteenth Annual Northeast Bioengineering Conference, Boston, Massachusetts, March 1989.

·         V. Digalakis, D. Manolakis, P. Lazaridis and V. K. Ingle.
Enhancement of Digital Angiographic Images with Misregistration Correction and Spatially-Adaptive Matched Filtering.
Visual Communications and Image Processing '92 Proceedings, SPIE Vol. 1818, Boston, Massachusetts, November 1992, pp. 1264-1270.

·         V. Digalakis and K. C. Chou.
Maximum Likelihood Identification of Multiscale Stochastic Models Using the Wavelet Transform and the EM algorithm.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Minneapolis, Minnesota, April 1993, pp. IV-93 - IV-96.

·         H. Murveit, J. Butzberger, V. Digalakis and M. Weintraub.
Large-Vocabulary Dictation Using SRI's DECIPHER(TM) Speech Recognition System: Progressive-Search Techniques.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Minneapolis, Minnesota, April 1993, pp. II-319 - II-322.

·         with M. Rayner et al.
A Speech to Speech Translation System Built from Standard Components.
Proceedings of the Human Language Technology Workshop, Princeton, New Jersey, March 1993, pp. 217 - 222.

·         V. Digalakis, D. Manolakis, V. K. Ingle and A. L. Kok.
Automatic Adaptive Contrast Enhancement for Radiological Imaging.
Proceedings of IEEE International Symposium on Circuits and Systems, Chicago, Illinois, May 1993, pp. 810 - 813.

·         with M. Rayner et al.
Spoken Language Translation with Mid-90's Technology: A Case Study.
Proceedings of the European Conference on Speech Communication and Technology, 1993, pp. 1299 - 1302.

·         V. Digalakis, P. Monaco and H. Murveit.
Acoustic Calibration and Search in SRI's Large Vocabulary Speech Recognition System.
Proceedings of the IEEE ASR workshop, Snowbird, Utah, December 1993, pp. 46 - 47.

·         V. Digalakis and H. Murveit.
Genones: Optimizing the Degree of Mixture-Tying in a Large-Vocabulary HMM-Based Speech Recognizer.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Adelaide, Australia, April 1994, pp. I-537 - I-540.

·         V. Digalakis and H. Murveit.
High-Accuracy Large-Vocabulary Speech Recognition Using Mixture-Tying and Consistency Modeling.
Proceedings of the Human Language Technology Workshop, Princeton, New Jersey, March 1994, pp. 292 - 297.

·         M. Rayner, D. Carter, V. Digalakis and P. Price.
Combining Knowledge Sources to Reorder N-Best Speech Hypothesis Lists.
Proceedings of the Human Language Technology Workshop, Princeton, New Jersey, March 1994, pp. 212 - 217.

·         H. Murveit, P. Monaco, V. Digalakis and J. Butzberger.
Techniques to Achieve an Accurate Real-Time Large-Vocabulary Speech Recognition System.
Proceedings of the Human Language Technology Workshop, Princeton, New Jersey, March 1994, pp. 368 - 373.

·         M. Weintraub, L. Neumeyer and V. Digalakis.
SRI November 1993 CSR Spoke Evaluation.
Proceedings of the ARPA Spoken Language Systems Technology Workshop, Princeton, New Jersey, March 1994.

·         V. Digalakis and L. Neumeyer.
Fast Speaker Adaptation Using Constrained Reestimation of Gaussian Mixtures.
Proceedings of the ARPA Spoken Language Systems Technology Workshop, Austin, Texas, February 1995.

·         Vassilios Digalakis, Mitch Weintraub, Ananth Sankar, Horacio Franco, Leonardo Neumeyer, and Hy Murveit.
Continuous Speech Dictation on ARPA's North American Business News Domain.
Proceedings of the ARPA Spoken Language Systems Technology Workshop, Austin, Texas, February 1995.

·         V. Digalakis and L. Neumeyer.
Speaker Adaptation Using Combined Transformation and Bayesian Methods.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, May 1995.

·         Sankar, F. Beaufays and V. Digalakis.
Training Data Clustering for Improved Speech Recognition.
Proceedings of European Conference on Speech Communication and Technology, September 1995.

·         H. Franco and V. Digalakis.
Temporal Correlation Modeling in a Hubrid Heural Network/Hidden Markov Model Speech Recognizer.
Proceedings of European Conference on Speech Communication and Technology, September 1995.

·         L. Neumeyer, A. Sankar and V. Digalakis.
A Comparative Study of Speaker Adaptation Techniques.
Proceedings of European Conference on Speech Communication and Technology, September 1995.

·         V. Diakoloukas, V. Digalakis, L. Neumeyer and J. Kaja.
Development of Dialect-Specific Speech Recognizers Using Adaptation Methods.
Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, April 1997.

·         V. Diakoloukas and V. Digalakis.
Adaptation of Hidden Markov Models Using Multiple Stochastic Transformations.
Proceedings of European Conference on Speech Communication and Technology, September 1997.

·         V. Digalakis.
On-line Adaptation of Hidden Markov Models Using Incremental Estimation Algorithms.
Proceedings of European Conference on Speech Communication and Technology, September 1997.

·         T. Salonidis and V. Digalakis.
Robust Speech Recognition for Multiple Topological Scenarios of the GSM Mobile Phone System.
Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, May 1998.

·         K. Koumpis, V. Digalakis and H. Murveit.
Design and Implementation of an Auto-attendant System for the T.U.C. Campus Using Speech Recognition.
Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, 1998.

·         V. Digalakis, L. Neumeyer and M. Perakakis.
Quantization of Cepstral Parameters for Speech Recognition over the World Wide Web.
Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, May 1998.

·         V. Digalakis, V. Doumpiotis and S. Tsakalidis,
On the Integration of Dialect and Speaker Adaptation in a Multi-Dialect Speech Recognition System”,
Proceedings of European Signal Processing Conference EUSIPCO-98, Sept. 1998.

·         L. Neumeyer, H.Franco, V. Abrash, L. Julia, O. Ronen, H. Bratt, J. Bing, V. Digalakis, and Marikka Rypa,
WebGrader(TM): A Multilingual Pronunciation Practice Tool,
Proc. Speech Technology in Language Learning Workshop, Stockholm, Sweden, 1998.

·         V. Digalakis et al,
Rapid Speech Recognizer Adaptation to New Speakers,
Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing,
March 1999.

·         E. Bocchieri, V. Digalakis, A. Corduneanu and C. Boulis,
Correlation Modeling Of MLLR Transform Biases For Rapid HMM Adaptation To New Speakers,
Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, March 1999.

·         S. Tsakalidis, V. Digalakis and L. Neumeyer,
Efficient Speech Recognition Using Subvector Quantization and Discrete Mixture HMMs,
Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, March 1999.

·         V. Digalakis, S. Tsakalidis and L. Neumeyer,
Reviving Discrete HMMs: The Myth About the Supreriority of Continuous HMMs,
Proceedings of European Conference on Speech Communication and Technology, September
1999.

·         C. Boulis and V. Digalakis,
Fast Speaker Adaptation of Large Vocabulary Continuous Density HMM Speech Recognizer Using a Basis Transform Approach,
Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, June
2000.

·         C. Vosnidis and V. Digalakis,
Use of Clustering Information for Coarticulation Compensation in Speech Synthesis by Word Concatenation,
Proceedings of European Conference on Speech Communication and Technology, September
2001.

·         V. Digalakis, D. Oikonomidis, D. Pratsolis, N. Tsourakis, C. Vosnidis, N. Chatzichrisafis and V. Diakoloukas,
Large Vocabulary Continuous Speech Recognition in Greek: Corpus and an Automatic Dictation System,
Proceedings of the European Conference on Speech Communication and Technology, September 2003.

·         D. Oikonomidis and V. Digalakis,
Stem-based Maximum Entropy Language Models for Inflectional Languages,
Proceedings of the European Conference on Speech Communication and Technology, September 2003.

·         N. Chatzichrisafis, V. Digalakis, V. Diakoloukas and  C. Harizakis,
Rapid Acoustic Model Development using Gaussian Mixture Clustering and Language Adaptation,
Interspeech 2004, Korea, October 2004.

·         Nikos Tsourakis, Dimitris Pratsolis, Costas Harizakis and Vassilis Digalakis,
An Architecture for Multimodal Applications Over Wireless Data Networks,
International Conference of Intelligent Environments, Athens, Greece, July 2006.

·         G. Tsontzos,  V. Diakoloukas, C. Coniaris and V. Digalakis,
Estimation of General Identifiable Linear Dynamic Models with an Application in Speech Recognition,
Proceedings of ICASSP 2007,Hawaii, USA, April 2007.

·         N. Tsourakis and V. Digalakis,
A Generic Methodology of Converting Transliterated Text To Phonetic Strings. Case Study: Greeklish,
Proceedings of Interspeech/Eurospeech 2007, Antwerp, Belgium, August 2007.

·         D. Oikonomidis, V. Diakoloukas and V. Digalakis,
A Sub-optimal Viterbi-like Search for Linear Dynamic Models Classification,
Proceedings of Interspeech/Eurospeech 2007, Antwerp, Belgium, August 2007.

·         D. Pratsolis, N. Tsourakis and V. Digalakis,
Degradation of Speech Recognition Performance over Lossy Data Networks,
Third ACM International Workshop on Wireless Multimedia Networking and Performance Modeling (WMuNeP), October 2007, Chania, Greece.

·         P. Papadopoulos and V. Digalakis,
Identification of Linear Systems in Canonical Form through an EM Framework,
Proceedings of ICASSP 2010, Dallas, USA, 2010.

 


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