Areas of interest

• Speech Synthesis and Analysis
• Pattern Recognition
• Digital Signal Processing

CV data

Sotiris Karabetsos received the M. Eng. degree in Electrical Engineering and Computer Science from the National Technical University of Athens (NTUA), in 2004 and the MSc. degree in Data Communications from Brunel University of London, in 2003. He has also received the BS degree in Electronic Engineering from the Technological and Educational Institution of Athens (TEI of Athens), in 1999. He is currently working towards the Ph.D. degree in Speech Synthesis at NTUA.

From 2003, he is with the Institute for Language and Speech Processing (ILSP) / R.C. “Athena”. He is also with the Technological and Educational Institution of Athens (TEI of Athens), Department of Electronics. His research interests are speech synthesis, signal processing, and telecommunications. He is a member of IEEE.

He has participated in National and European research and development projects in the areas of Speech Technology, Signal Processing, Computational Intelligence as well as Telecommunications.

His current interests include Digital Signal Processing, Pattern Recognition, Computational Intelligence and Telecommunications with application in analysis and speech synthesis, biological signal processing, image processing, multimedia systems and the physical layer of communication access networks (either wired, wireless or optical).

He has authored or co-authored several papers, in peer reviewed journals and conferences, in the above domains.

• Raptis, S., Karabetsos, S., Chalamandaris, A. & Tsiakoulis, P. (2015). A framework towards expressive speech analysis and synthesis with preliminary results. Journal on Multimodal User Interfaces, 9(4), 387-394. [...] 
• Koutsombogera, M., Galanis, D., Maria Teresa Riviello, Nick Tseres, Karabetsos, S., Anna Esposito et al (2015). Conflict Cues in Call Centre Interactions, pages 431-447. Springer International Publishing. [...] 
• Raptis, S., Karabetsos, S., Chalamandaris, A. & Tsiakoulis, P. (2014). Towards expressive speech synthesis: Analysis and modeling of expressive speech. In 2014 5th IEEE Conference on Cognitive Infocommunications (CogInfoCom), pages 461-465. [...] 
• Chalamandaris, A., Tsiakoulis, P., Karabetsos, S. & Raptis, S. (2014). Using Audio Books for Training a Text-to-Speech System.. In LREC, pages 3076-3080. [...] 
• Raptis, S., Chalamandaris, A., Tsiakoulis, P. & Karabetsos, S (2014). Open Web-Based Text-to-Speech Services for the Citizens. " HCI International 2014 - Communications in Computer and Information Science". Berlin / Heidelberg : Springer. [...] 
• Tsiakoulis, P., Karabetsos, S., Chalamandaris, A. & Raptis, S (2014). An Overview of the ILSP Unit Selection Text-to-Speech Synthesis System. In A. Likas, K., Blekas, D. & Kalles (editors), " Artificial Intelligence: Methods and Applications Lecture Notes in Computer Science.". Berlin / Heidelberg : Springer. [...] 
• Chalamandaris, A., Tsiakoulis, P., Karabetsos, S. & Raptis, S. (2013). An Automated Method for Creating New Synthetic Voices from Audiobooks. In Proc. 6th Language & Technology Conference: Human Language Technologies as a Challenge for Computer Science and Linguistics (LTC 2013). [...] 
• Chalamandaris, A., Tsiakoulis, P., Karabetsos, S. & Raptis, S. (2013). The ILSP/INNOETICS Text-to-Speech System for the Blizzard Challenge 2013. In The Blizzard Challenge 2013 workshop. Reykjavik, Iceland Barcelona, Spain. [...] 
• Galanis, D., Karabetsos, S., Koutsombogera, M., Papageorgiou, H., Anna Esposito & Maria Teresa Riviello. (2013). Classification of emotional speech units in call centre interactions. In Cognitive Infocommunications (CogInfoCom), 2013 IEEE 4th International Conference, pages 403-406. IEEE. [...] 
• Raptis, S., Chalamandaris, A., Tsiakoulis, P. & Karabetsos, S. (2012). The ILSP Text-to-Speech System for the Blizzard Challenge 2012. In The Blizzard Challenge 2012. Portland, Oregon, USA. [...] 
• Raptis, S., Chalamandaris, A., Tsiakoulis, P. & Karabetsos, S (2011). Corpus Design for a Unit Selection TtS System with Application to Bulgarian. In Z. Vetulani (editor), Human Language Technology. Challenges for Computer Science and Linguistics. Berlin/Heidelberg : Springer. [...] 
• Raptis, S., Chalamandaris, A., Tsiakoulis, P. & Karabetsos, S. (2011). The ILSP Text-to-Speech System for the Blizzard Challenge 2011. In The Blizzard Challenge 2011. Turin, Italy. [...] 
• Raptis, S., Chalamandaris, A., Tsiakoulis, P. & Karabetsos, S. (2010). The ILSP Text-to-Speech System for the Blizzard Challenge 2010. In Proc. Blizzard Challenge 2010 Workshop. Kyoto, Japan. [...] 
• Karabetsos, S., Tsiakoulis, P., Chalamandaris, A. & Raptis, S. (2010). One-Class Classification for Spectral Join Cost Calculation in Unit Selection Speech Synthesis. IEEE Signal Processing Letters, 17(8), 746-749. [...] 
• Chalamandaris, A., Karabetsos, S., Tsiakoulis, P. & Raptis, S. (2010). A Unit Selection Text-to-Speech Synthesis System Optimized for Use with Screen Readers. IEEE Transactions on Consumer Electronics, 56(3), 1890-1897. [...] 
• Karabetsos, S. (2010). Improving Speech Synthesis Quality for Application in Contemporary Telecommunication Environments and Services. Phd Thesis, NTUA. [...] 
• Chalamandaris, A., Tsiakoulis, P., Raptis, S. & Karabetsos, S. (2009). Design of an Efficient Corpus for High-Quality Unit Selection TTS for Bulgarian. In Proc. 4th Language & Technology Conference: Human Language Technologies as a Challenge for Computer Science and Linguistics. Poland. [...] 
• Chalamandaris, A., Tsiakoulis, P., Karabetsos, S. & Raptis, S. (2009). An Efficient and Robust Pitch Marking Algorithm on the Speech Waveform for TD-PSOLA. In Proc. Intl. IEEE Conference on Signal and Image Processing Applications (ICSIPA). Malaysia. [...] 
• Raptis, S., Tsiakoulis, P., Chalamandaris, A. & Karabetsos, S. (2009). High Quality Unit-Selection Speech Synthesis for Bulgarian. In Proc. 13th International Conference on Speech and Computer (SPECOM'2009). St. Petersburg, Russia. [...] 
• Karabetsos, S., Tsiakoulis, P., Chalamandaris, A. & Raptis, S. (2009). Embedded Unit Selection Text-to-Speech Synthesis for Mobile Devices. IEEE Transactions on Consumer Electronics, 56(2). [...] 
• Raptis, S., Tsiakoulis, P., Chalamandaris, A. & Karabetsos, S (2009). User Interaction Design for a Home-Based Telecare System. In A. Holzinger & K. Miesenberger (editors), Human-computer interaction and Usability for eInclusion. Berlin / Heidelberg : Springer. [...] 
• Chalamandaris, A., Raptis, S., Tsiakoulis, P. & Karabetsos, S (2009). Enhancing Accessibility of Web Content for the Print-Impaired and Blind People. In A. Holzinger & K. Miesenberger (editors), Human-computer interaction and Usability for eInclusion. Berlin / Heidelberg : Springer. [...] 
• Tsiakoulis, P., Chalamandaris, A., Karabetsos, S. & Raptis, S. (2008). A Statistical Method for Database Reduction for Embedded Unit Selection Speech Synthesis. In IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2008), pages 759-762. USA, Las Vegas. [...] 
• Karabetsos, S., Tsiakoulis, P., Chalamandaris, A. & Raptis, S (2008). HMM-based Speech Synthesis for the Greek Language. In Petr Sojka, Ivan Kopecek & Karel Pala (editors), Text, Speech and Dialogue. Berlin / Heidelberg : Springer. [...] 
• 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. [...] 
• 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. [...] 
• Karabetsos, S. (2003). System level design and simulation of an OFDM transceiver that conforms to the IEEE 802.11a standard. Master Thesis, Brunel University. [...]