RAMASUBRAMANIAN

Qualification :
B.Sc. ('81), B.E (IISc, '84), Ph.D. (TIFR, '92)

Professinal Experience :
1. Research Scholar, TIFR, Mumbai (1984-1992)
2. Visiting Scientist, Univ. Valencia, Spain (1991-92)
3. Fellow, TIFR (1993-98)
4. Invited Researcher, ATR, Kyoto, Japan (1996-97)
5. Reader, TIFR (1998-99)
6.Research Associate, IISc (2000-04)
7. Senior Research Fellow, Siemens Corporate Research & Technology, (2005-06)
8. Head, Professional Speech Processing - India, Siemens Corporate Research & Technology (2006-09)
9. Senior Member Technical Staff, Siemens Corporate Research & Technology (2006-13)
10. Professor, PESIT-South Campus (2013-)

• TTS Consortium Project, DeitY, MCIT, 2014-15, INR 56 Lakhs

PI of TTS project

Speech recognition, Speaker recognition, Speech coding, Speech synthesis, Language identification, Audio processing, audio indexing and retrieval, Pattern recognition, Machine learning, Physiological and neural basis for hearing, Computational auditory scene analysis, Computational algorithms, Basic and applied research in spoken language human-computer interaction.

Select publications (1984-2014)

K. K. Paliwal and V. Ramasubramanian. Effect of ordering the codebook on the efficiency of the partial distance search algorithm for vector quantization. IEEE Transactions on Communications, COM-37:538–540, May 1989

V. Ramasubramanian and K. K. Paliwal. Fast K-d tree algorithms for nearest-neighbor search with application to vector quantization encoding. IEEE Transactions on Acoustics, Speech and Signal Processing, 40(3):518–531, Mar 1992

V. Ramasubramanian and K. K. Paliwal. Fast vector quantization encoding based on K-d tree backtracking search algorithm. Digital Signal Processing, 7(3):163–187, Jul 1997

V. Ramasubramanian and K. K. Paliwal. Voronoi projection based fast nearest-neighbor search algorithms: box-search and mapping table based search techniques. Digital Signal Processing, 7:260–277, 1997

V. Ramasubramanian and K. K. Paliwal. Fast nearest-neighbor search based on Voronoi projections and its application to vector quantization encoding. IEEE Transactions on Speech and Audio Processing, 7(2):221–226, Mar 1998

V. Ramasubramanian and K. K. Paliwal. Fast nearest-neighbor search algorithms based on approximation-elimination search. Pattern Recognition, 33(9):1497–1510, Sep 2000

K. K. Paliwal and V. Ramasubramanian. Comments on “Modified K-means algorithm for vector quantizer design”. IEEE Transactions on Image Processing, 9(11):1964–1967, Nov 2000

V. Ramasubramanian and K. K. Paliwal. An efficient approximation-elimination algorithm for fast nearest-neighbor search. In Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP ’92), pages I–89–I–92, San Francisco, California, Mar 1992.

V. Ramasubramanian and K. K. Paliwal. Reducing the complexity of the LPC vector quantizer using the K-d tree search algorithm. In Proc. of the 5th European Conference on Speech Communication and Technology (EUROSPEECH ’97, pages 1255-1258, Rhodes, Greece, Sep 1997.

V. Ramasubramanian, A. K. V. Sai Jayram, and T. V. Sreenivas. Language identification using parallel sub-word recognition – an ergodic HMM equivalence. In Proceedings of 8th European Conference on Speech Communication and Technology (EUROSPEECH ’03), pp. 1357–1360, Geneva, Switzerland, Sep 2003.

V. Ramasubramanian, P. Srinivas and T. V. Sreenivas. Stochastic pronunciation modeling by ergodic-HMM of acoustic sub-word units. In Proc. 9th European Conference on Speech Communication and Technology (INTERSPEECH - EUROSPEECH ’05), pp. 1361–1364, Lisbon, Portugal, Sep. 2005.

V. Ramasubramanian, Amitav Das and Praveen Kumar. Text-dependent speaker-recognition using one-pass dynamic programming algorithm. In Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP ’06), pp. I-901–904, Toulouse, France, May 2006

V. Ramasubramanian and V. Deepak. Highly Noise Robust Text-dependent Speaker Recognition based on Hypothesized Wiener Filtering. In Proc. INTERSPEECH-2006, pp. 1455–1458, Pittsburgh, Sept 2006.

V. Ramasubramanian and D. Harish. An unified unit-selection framework for ultra low bit-rate speech coding. In Proc. INTERSPEECH-2006, pp. 217–220, Pittsburgh, Sept 2006.

V. Ramasubramanian and D. Harish. An optimal unit-selection algorithm for ultra low bit-rate speech coding. In Proceedings of IEEE International Conference on Acoustics, Speech, and Signal
Processing (ICASSP ’07), pp. IV-541–544, Hawaii, 2007.

V. Ramasubramanian, Kaustubh Kulkarni and Bernhard Kaemmerer. Acoustic modeling by phoneme templates and one-pass DP decoding for continuous speech recognition. In Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, (ICASSP ’08), pp. 4105–4108, Las Vegas, Mar 2008

D. Harish and V. Ramasubramanian. Comparison of segment quantizers: VQ, MQ, VLSQ and Unit-selection algorithms for ultra low bit-rate speech coding. In Proceedings of IEEE International
Conference on Acoustics, Speech, and Signal Processing (ICASSP ’08), pp. 4773–4776, Las Vegas, Mar 2008.

V. Ramasubramanian and D. Harish. Low complexity near-optimal unit-selection algorithm for ultra low bit-rate speech coding based on N-best lattice and Viterbi decoding. In Proc. Interspeech '08, pp. 44, Brisbane, Sep 2008.

V. Ramasubramanian and Deepak Vijaywargi. Speech enhancement using hypothesized Wiener filtering (HWF). In Proc. Interspeech '08, pp. 167–170, Brisbane, Sep 2008.

V. Ramasubramanian and D. Harish. Ultra low bit-rate speech coding based on unit-selection with joint spectral-residual quantization: No transmission of any residual information. In Proc. Interspeech '09, pp. 2615-2618, Brighton, UK, Sep 2009.

Srikanth Cherla and V. Ramasubramanian. Audio analytics by template modeling and 1-pass DP based decoding. In Proc. Interspeech '10, pp. 2230-2233, Chiba, Japan, Sep 2010

V. Ramasubramanian, R. Karthik, S. Thiyagarajan and Srikanth Cherla. Continuous audio analytics by HMM and Viterbi decoding. In Proc. ICASSP’ 11, pp. 2396-2399, Prague, Czech Republic, May 2011

V. Ramasubramanian. Ultra low bit-rate speech coding: An overview and recent results. In Proc. IEEE International Conference on Signal Processing and Communication (SPCOM), Bangalore, 2012

V. Ramasubramanian, S. Thiyagarajan, G. Pradnya, Heiko Claussen, Justinian Rosca. Two-class verifier framework for audio indexing. Proc. ICASSP 2013, Vancouver, Canada, 2013.

V. Ramasubramanian. Speaker spotting: Automatic telephony surveillance for homeland security. In Advances in Forensic Speaker Recognition: Criminal Justice and Counter-terrorism, Amy
Neustein and Hemant Patil (eds), pp. 427-468, Springer Verlag, 2011

Heiko Claussen, Justinian Rosca, V. Ramasubramanian, S. Thiyagarajan. Generalized Mutual Interdependence Analysis of Noisy Channels. In ‘Excursions in Harmonic Analysis’, (eds) Travis
Andrews, Radu V. Balan, John J. Benedetto, Wojciech Czaja, and Kasso Okoudjou, Springer Birkhuser, NY 2012.

V. Ramasubramanian and Harish Doddala Ultra low bit-rate speech coding. Springer-Brief, Springer Verlag NY, Dec 2014.

Conferences/ workshops
Select List: EUSIPCO-90, ICASSP 1992 San Francisco; 2006 Toulouse; 2008 Las Vegas; Interspeech 2005 Lisbon; 2006 Pittsburgh; 2008 Brisbane; ACM Mobile CHI 2007 Singapore; SPCOM 2012, Bangalore; Winter Schools WiSSAP 2006-14.