My general research interests are in neural networks, signal
processing, and machine learning.
Speech recognition has been the main application of my work.
Other areas of interest are telecommunications, bioinformatics, and scientific
visualization.
List of publications:
- P. Somervuo, Online Algorithm for the Self-Organizing Map of Symbol Strings, Neural Networks, 17, 2004, pp. 1231-1239. pdf
- P. Somervuo, Comparison of ML, MAP, and VB based acoustic models in large vocabulary speech recognition, 8th International Conference on Spoken Language Processing (ICSLP) , Jeju Island, Korea, October 5-8, 2004. pdf
- P. Somervuo and A. Härmä, Bird song recognition based on syllable pair histograms, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'04) Montreal, Canada, May 17-21, 2004.
pdf
- A. Härmä and P. Somervuo, Classification of the harmonic structure in bird vocalization, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'04) Montreal, Canada, May 17-21, 2004.
- P. Somervuo, Self-Organizing Map of Symbol Strings with Smooth Symbol Averaging, Workshop on Self-Organizing Maps (WSOM'03) Hibikino, Kitakyushu, Japan, September 11-14, 2003.
pdf
- P. Somervuo and A. Härmä, Analyzing Bird Song Syllables on the Self-Organizing Map, Workshop on Self-Organizing Maps (WSOM'03) Hibikino, Kitakyushu, Japan, September 11-14, 2003.
pdf
- M. Oja, P. Somervuo, S. Kaski, and T. Kohonen, Clustering of human endogenous retrovirus sequences with median self-organizing map, Workshop on Self-Organizing Maps (WSOM'03) Hibikino, Kitakyushu, Japan, September 11-14, 2003.
pdf
- P. Somervuo, B. Chen, and Q. Zhu, Feature Transformations and Combinations for Improving ASR Performance, 8th European Conference on Speech
Communication and Technology (Eurospeech/Interspeech) ,
Geneva, Switzerland, September 1-4, 2003.
pdf
- P. Somervuo, Experiments with Linear and Nonlinear Feature Transformations in HMM Based Phone Recognition, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) , Hong Kong, 2003, vol. I, pp. 52-55.
pdf
- P. Somervuo, Speech Dimensionality Analysis on Hypercubical Self-Organizing Maps, Neural Processing Letters, 17(2), 2003, pp. 125-136.
pdf
- T. Kohonen and P. Somervuo, How to make large self-organizing maps for nonvectorial data, Neural Networks 15(8-9), 2002, pp. 945-952.
- P. Somervuo, Speech Modeling Using Variational Bayesian Mixture of Gaussians, 7th International Conference on Spoken Language Processing (ICSLP) , Denver, Colorado, USA, September 16-20, 2002.
pdf
- P. Somervuo, Two-level phoneme recognition based on successive use of monophone and diphone models, XI European Signal Processing Conference (EUSIPCO) , Toulouse, France, September 3-6, 2002, vol. III, pp. 77-80.
pdf
- P. Somervuo, ``Self-Organizing Maps for
Signal and Symbol Sequences'', PhD Thesis , Helsinki
University of Technology, 2000. Published in Acta Polytechnica
Scandinavica, Mathematics and Computing Series No. 107, ISBN 951-666-550-0.
- P. Somervuo and T. Kohonen, Clustering and Visualization of
Large Protein Sequence Databases by Means of an Extension of the
Self-Organizing Map, 3rd International Conference on Discovery
Science, Kyoto, Japan, Dec. 4-6, 2000, Lecture Notes in
Artificial Intelligence 1967 . pp. 76-85.
pdf
- P. Somervuo, Competing Hidden Markov Models on the Self-Organizing
Map, Proceedings of the International Joint Conference on
Neural Networks (IJCNN'2000), Como, Italy, July 24-27, 2000, vol 3,
pp. 169-174.
pdf
- P. Somervuo, Speech Recognition Using Temporally Connected Kernels
in Mixture Density Hidden Markov Models,
Proceedings of the IEEE International Conference on Acoustics,
Speech, and Signal Processing (ICASSP'2000), Istanbul, Turkey, June
5-9, 2000, vol. 6, pp. 3434-3437.
pdf
- P. Somervuo, Time Topology for the Self-Organizing Map,
Proceedings of the International Joint Conference on Neural Networks
(IJCNN'99), Washington DC, USA, July 10-16, 1999, vol. 3, pp. 1900-1905.
pdf
- P. Somervuo and T. Kohonen, Self-Organizing Maps and Learning Vector
Quantization for Feature Sequences, Neural Processing Letters,
10(2), 1999, pp. 151-159.
pdf
- P. Somervuo, Redundant Hash Addressing of Feature Sequences Using
the Self-Organizing Map, Neural Processing Letters, 10(1),
1999, pp. 25-34.
pdf
- T. Kohonen and P. Somervuo, Self-Organizing Maps of Symbol
Strings, Neurocomputing 21, 1998, pp. 19-30.
- T. Kohonen and P. Somervuo, Self-Organizing Maps of Symbol
Strings with Application to Speech Recognition, Proceedings of
the Workshop on Self-Organizing Maps (WSOM'97), Espoo,
Finland, 1997, pp. 2-7.
pdf
- M. Karjalainen, P. Boda, P. Somervuo, and T. Altosaar, Applications
for the Hearing-Impaired: Evaluation of Finnish Phoneme Recognition
Methods, Proceedings of the 5th European Conference on Speech
Communication and Technology (EUROSPEECH'97),
Rhodes, Greece, 1997, vol. 4, pp. 1811-1814.
pdf
- M. Kurimo and P. Somervuo, Using the Self-Organizing Map to Speed up
the Probability Density Estimation for Speech Recognition with mixture
density HMMs, Proceedings of the International Conference on Spoken
Language Processing (ICSLP'96), Philadelphia, PA, USA, 1996, pp. 358-361.
- P. Somervuo, Speech recognition using context vectors and
multiple feature streams, Master's Thesis , Helsinki
University of Technology, 1996. PostScript
Panu.Somervuo@hut.fi