Dr. T. Nagarajan Designation : Professor and Head Department : Computer Science and Engineering School : SNU, Chennai Email ID : [email protected]
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Name : Dr. T. Nagarajan Designation : Professor and Head Department : Computer Science and Engineering School : SNU, Chennai Email ID : [email protected] Profile Summary Dr. T. Nagarajan earned his PhD degree from the Computer Science and Engineering department of IIT Madras in the year 2004. In his doctoral research, he was working on spoken language identification task. After his PhD, he joined TeNet group of IITM as a Senior-project-officer. During this period, he was working on a project, named, Multimodal Interface. Subsequently, he joined the National Institute of Scientific Research (INRS), Montreal, Canada, as a postdoctoral fellow and worked there for two years. During his postdoctoral research he was focusing on Continuous speech recognition task, in which he specifically focused on discriminative training techniques for better classification. After two years of postdoctoral research, he has joined SSN College of Engineering as a professor and he has been serving SSN since then. Educational Qualifications: ● 2004 Ph. D - Computer Science and Engineering, IIT Madras ● 1992 M. E - Madurai Kamaraj University Work Experience ● 2009 – till date Professor and Head, Department of IT, SSN College of Engineering ● 2006 – 2009 Professor, Department of IT, SSN College of Engineering ● 2005 – 2006 Post-Doctoral Fellow, INRS, University of Quebec, Montreal, Canada ● 2004 – 2005 Senior Project Officer, IC & SR, IIT Madras ● 2000 – 2004 Teaching Assistant, Department of CSE, IIT Madras ● 1995 – 2000 Assistant Professor and Head, PMC Tech, Thanjavur ● 1992 – 1995 Senior Lecturer, PMC Tech, Thanjavur Research Areas ● Automatic Speech Recognition ● Text-to-Speech Synthesis ● Speech Signal Processing ● Acoustic Modeling ● Machine Learning ● Music Signal Processing Courses Taught (frequently handled alone) ● Speech Signal Processing ● Digital Signal Processing ● Data Mining ● Big Data Analytics Awards: 2020 Chief Minister’s Award for Tamil Computing for the year 2019, from the government of Tamil Nadu, for his contribution to Tamil for building a lightweight HMM-Based speech synthesizer and developing various applications. Scholarly Activity: (a) Projects - Title: Standalone Domain Specific Speech to Speech translator for English and Indian Languages Funding Agency: IMPREST IIC Investigator: Dr. T. Nagarajan Co-Investigator: Dr. P. Vijayalakshmi Status: Proposal Submitted – consortium mode with IITDh as lead SSN’s part of total fund: Rs. 113 lakhs Duration: 2020 – 2024 - Title: Tamil Pronunciation Error Detection Aid for Children – Prototype Funding Agency: Murasu Systems Sdn Bhd, Malaysia Chief Investigator: Dr. T. Nagarajan Co-Investigator: Dr. P. Vijayalakshmi Status: Completed Duration: Sep 2019 – Sep 2019 Amount: Rs. 0.5 lakh - Title: Speech Assistive Aids for Visually-Challenged People Funding Agency: Tamil Virtual Academy (TVA), Chennai Chief Investigator: Dr. T. Nagarajan Co-Investigator: Dr. P. Vijayalakshmi Status: Completed Duration: Aug 2018 – Aug 2019 Amount: Rs. 25 lakhs - Title: Speech-Input Speech-Output Communication Aid (SISOCA) for Speakers with Cerebral Palsy Funding Agency: DST-TIDE Chief Investigator: Dr. P. Vijayalakshmi Co-Investigator: Dr. T. Nagarajan Status: Ongoing Duration: May 2017 – Apr 2020 Amount: Rs. 13.72 lakh - Title: HMM-based Text-to-Speech Synthesis System for Malaysian Tamil Funding Agency: Murasu Systems Sdn Bhd, Malaysia Chief Investigator: Dr. T. Nagarajan Co-Investigator: Dr. P. Vijayalakshmi Status: Completed Duration: Nov 2016 – Jul 2017 Amount: Rs. 4 lakh - Title: Speech-Enabled Interactive Enquiry System in Tamil Funding Agency: Tamil Virtual Academy (TVA), Chennai Chief Investigator: Dr. T. Nagarajan Co-Investigators: Dr. P. Vijayalakshmi, Dr. B. Bharathi, Ms. S. Sasirekha Status: Completed Duration: Mar 2016 – July 2017 Amount: Rs. 9.52 lakh - Title: Development of Text-to-Speech System in Indian Languages: High-Quality Text-to-Speech Synthesis and Small Footprint TTS Integrated with Disability Aids (A consortium project with IIT Madras as Team Leader) Funding Agency: Ministry of Electronics and Information Technology (MeitY), Government of India, New Delhi Chief Investigator at SSNCE: Dr. T. Nagarajan Co-Investigators at SSNCE: Dr. P. Vijayalakshmi and Dr. A. Shahina Status: Completed Duration: 2012 – 2017 Amount: Rs.77 lakh - Title: An assessment and intelligibility modification system for dysarthric speakers Funding Agency: AICTE – RPS (A), New Delhi Investigators: Dr. P. Vijayalakshmi and Dr. T. Nagarajan Status: Completed Duration: 2010 – 2012 Amount: Rs. 9 lakh - Title: Design of lab model of speech processor for cochlear implants Funding Agency: SSN Trust Investigators: Dr. P. Vijayalakshmi, Dr. T. Nagarajan & Dr. A. Shahina Status: Completed Duration: 2010 – 2012 Amount: Rs. 0.8 lakh - Title: Anatomical vibration sensor speech corpus for speech applications in noisy environments. Funding Agency: SSN Trust Investigators: Dr. A. Shahina, Dr. T. Nagarajan & Dr. P. Vijayalakshmi Status: Completed Duration: 2010 – 2012 Amount: Rs. 1.23 lakh - (b) Journal Publications (accepted or published) 1. Rachel, G.A., Vijayalakshmi, P. & Nagarajan, T. Analysis of algorithms to estimate glottal closure instants from speech signals. International Journal of Speech Technology (Sept 2020). https://doi.org/10.1007/s10772-020-09752-5 2. M. P. A. Jeeva, T. Nagarajan and P. Vijayalakshmi, "Adaptive multi-band filter structure-based far-end speech enhancement," in IET Signal Processing, vol. 14, no. 5, pp. 288-299, June 2020, doi: 10.1049/iet-spr.2019.0226. 3. Lavanya T, Nagarajan. T and Vijayalakshmi. P, Multi-Level Single-Channel Speech Enhancement Using a Unified Framework for Estimating Magnitude and Phase Spectra, IEEE/ACM Transactions on Audio, Speech, and Language Processing, 28, 1315-1327, 13 April 2020 4. T. A. M. Celin, T. Nagarajan and P. Vijayalakshmi, Data Augmentation Using Virtual Microphone Array Synthesis and Multi-Resolution Feature Extraction for Isolated Word Dysarthric Speech Recognition, IEEE Journal of Selected Topics in Signal Processing, 14, 2, 346-354, Feb 2020. doi: 10.1109/JSTSP.2020.2972161. (IF 6.68) 5. A. Mariya Celin, G. Anushiya Rachel, T. Nagarajan and P. Vijayalakshmi, “A Weighted Speaker-Specific Confusion Transducer Based Augmentative and Alternative Speech Communication Aid for Dysarthric Speakers”, IEEE Transactions on Neural Systems and Rehabilitation Engineering, Vol. 27, Issue 2, pp. 187-197, Feb 2019. 6. Mrinalini, T. Nagarajan and P. Vijayalakshmi, “Pause-Based Phrase Extraction and Effective OOV Handling for Low-Resource Machine Translation Systems”, ACM Transactions on Asian and Low Resource Language Information Processing, Vol. 18, Issue 2, pp. 12:1-12:22, Feb 2019. 7. Anushiya Rachel, N. Sripriya, P. Vijayalakshmi and T. Nagarajan, “Significance of Differenced EGG Signal as a Spectrum in Phase-Difference Computation for the Estimation of Glottal Closure Instants”, Circuits, Systems, and Signal Processing, Vol. 37, Issue 5, pp. 2074 – 2097, May 2018. 8. Vijayalakshmi, B. Ramani, M. P. Actlin Jeeva and T. Nagarajan “A Multilingual to Polyglot Speech Synthesizer for Indian Languages Using a Voice-Converted Polyglot Speech Corpus”, Circuits, Systems and Signal Processing, Vol. 37, Issue 5, pp. 2142 – 2163, May 2018. 9. Dhanalakshmi, T. A. Mariya Celin, T. Nagarajan and P. Vijayalakshmi, “Speech-Input Speech-Output Communication for Dysarthric Speakers Using HMM-Based Speech Recognition and Adaptive Synthesis System”, Circuits, Systems and Signal Processing, Vol. 37, Issue 2, pp. 674 – 703, Feb. 2018. 10. Anushiya Rachel, P. Vijayalakshmi and T. Nagarajan, “Estimation of Glottal Closure Instants from Degraded Speech using a Phase-Difference-Based Algorithm”, Computer Speech, and Language, Vol. 46, pp. 136 – 153, Nov. 2017. 11. Sherlin Solomi, P. Vijayalakshmi and T. Nagarajan, “Exploiting Acoustic Similarities Between Tamil and Indian English in the Development of an HMM-based Bilingual Synthesizer”, IET Signal Processing, Vol. 11, Issue 3, pp. 332-340, May 2017. 12. Ramani, M. P. Actlin Jeeva, P. Vijayalakshmi and T. Nagarajan, “A Multi-level GMM-Based Cross-Lingual Voice Conversion Using Language-Specific Mixture Weights for Polyglot Synthesis”, Circuits, Systems and Signal Processing, Vol. 35, pp. 1283-1311, Apr. 2016. 13. P. Actlin Jeeva, T. Nagarajan, P. Vijayalakshmi, “DCT derived spectrum-based speech enhancement algorithm using temporal-domain multiband filtering”, IET Signal Processing, Vol. 10, Issue 8, pp. 965-980, Oct. 2016. 14. Anushiya Rachel, V. Sherlin Solomi, K. Naveenkumar P. Vijayalakshmi and T. Nagarajan, “A small footprint context-independent HMM-based speech synthesizer for Tamil”, International Journal of Speech Technology, Vol. 18, Issue 3, pp. 405 – 418, Sep. 2015. 15. Sripriya, T. Nagarajan, “Estimation of glottal closure instants considering the speech signal as a spectrum”, IET Electronic Letters, Vol. 51, Issue 8, pp. 649 – 651, Apr. 2015. 16. Bharathi, T. Nagarajan, “Speaker verification using speaker-specific-text”, in WSEAS Transactions on Signal Processing, Vol. 10, pp. 320-330, July 2014. 17. Bharathi, C. Arunkumar and T. Nagarajan, “Improving the performance of speaker and language identification task using unique characteristics of a class”, International Journal of Speech Technology, Vol. 16, Issue 1, pp. 115-124,