KOH Soo Ngee
Professor of Electrical & Electronic Engineering
Division of Communication Engineering

Phone: 6790 5429, Fax: 6791 2687
Office: S1-B1b-43
Email: esnkoh@ntu.edu.sg

Biography

KOH SOO NGEE received the BEng degree from the University of Singapore and the BSc degree from the University of London both in 1979. He obtained his MSc and PhD degrees from Loughborough University, UK in 1981 and 1984 respectively. Prior to his return to Singapore, he worked as a consultant at the British Telecom Research Laboratories in England. He joined Nanyang Technological University (NTU) of Singapore in 1985. He was the founding Head of the Communication Engineering Division of the School of Electrical and Electronic Engineering (EEE) of NTU from 1995 to 2005, founding co-Chair of the International Conference on Information, Communications and Signal Processing, and Associate Chair (Academic) from 2005 to 2011. He is currently a Professor of the School and Director (Undergraduate Education) of the University. He has published more than 140 papers in international journals and conference proceedings, and holds two international patents on speech coder design. His research interests include speech processing, coding, enhancement and recognition, computer-aided language learning, blind source separation and secured communication.

Academic Qualification and Professional Affiliation

  • BEng Sing., BSc Lond., MSc PhD Lough.
  • SrMIEEE, FIES

Research Interests

  • Speech Processing, Coding, Enhancement and Recognition.
  • Secured Scramblers and Encoders.
  • Blind Source Separation and Communication Signal Processing.
  • Computer-Aided Language Learning.

Selected Publications

Journal Papers

  1. X B Liu, S N Koh, X W Wu and C C Chui, “Reconstructing a Linear Scrambler with Improved Detection Capability and in the Presence of Noise,” IEEE Transactions on Information Forensics and Security, Vol.7, No.1, January 2012, pp.208-218.
  2. V G Reju, S N Koh and I Y Soon, "Underdetermined Convolutive Blind Source Separation via Time-frequency Masking", IEEE Transactions on Audio, Speech and Language Processing, Vol. 18, No. 1. January 2010, pp. 101-116.
  3. V G Reju, S N Koh and I Y Soon, "An Algorithm for Mixing Matrix Estimation in Instantaneous Blind Source Separation", Signal Processing, Vol. 89, No 9, September 2009, pp. 1762-1773.
  4. T Li, S Rahardja and S N Koh, "Fixed Quality Layered Audio based on Scalable Lossless Coding", IEEE Transactions on Multimedia, Vol. 11, No. 3 April 2009, pp. 422-432.
  5. H Ding, I Y Soon and S N Koh, "A Spectral Filtering Method Based on Hybrid Wiener Filters for Speech Enhancement", Speech Communication, Vol. 51, No. 3, March 2009, pp. 259-267.
  6. V G Reju, S N Koh and I Y Soon, "Partial Separation Method for Solving Permutation Problem in Frequency Domain Blind Source Separation of Speech Signals", Neurocomputing, Vol. 71, No, 10-12, Jun 2008, pp. 2098-2112.
  7. T Li, S Rahardja and S N Koh, "Frequency Region based Prioritized Bit-plane Coding for Scalable Audio", IEEE Transactions on Audio, Speech and Language Processing, Vol. 16, No. 1, Jan 2008, pp. 94-105.
  8. C H You, S Rahardja and S N Koh, "Audible Noise Reduction in Eigendomain for Speech Enhancement", IEEE Transactions on Audio, Speech and Language Processing, Vol. 15 No. 6, Aug 2007, pp.1753-1765.
  9. C H You, S N Koh and S Rahardja, "Subband Kalman Filtering Incorporating Masking Properties for Noisy Speech Signal", Speech Communication, Vol 49, Issues 7-8, 2007, pp. 558-573.
  10. X B Liu, S N Koh and T H Cheng, "Improved Bit-based joint Source-Channel Decoding of Variable Length-Codes", IEEE Communication Letters, Vol 11, No 6, June 2007, pp.515-518.
  11. X Zhang, S N Koh, I Y Soon and C H You, "Post Processing in Masking-Based ß-Order MMSE Speech Enhancement", Applied Acoustics, Vol. 69, Issue 4, Apr 2008, pp. 354-357.
  12. V G Reju, S N Koh and I Y Soon, "Convolution Using Discrete Sine and Cosine Transforms", IEEE Signal Processing Letters, Vol. 14, NO.7, July 2006, pp.445-448.
  13. X Liu, C Lu, T H Cheng and S N Koh, "A Simplified Step-by-step Decoding Algorithm for Parallel Decoding of Reed-Solomon Codes," IEEE Transactions on Communications, Vol.55, No.6, June 2007, pp.1103-1109.
  14. C H You,  S N Koh and S Rahardja,  "Masking-based beta-order MMSE Speech enhancement",  Speech Communication,  Vol. 48, Issue 1, pp.57 - 70, January 2006.
  15. C H You, S N Koh and S Rahardja, "An Invertible Frequency Eigendomain Transformation for Masking-Based Subspace Speech Enhancement," IEEE Signal Processing Letters, Vol. 12, No. 5, May 2005, pp 461-464.
  16. X B Liu and S N Koh, "Iterative Joint Source-Channel Decoding with Combined A Priori Information of Source and Channel," IEEE Communications Letter, Vol.9, No. 4, April, 2005, pp.355-357.
  17. C H You, S N Koh and R Susanto , "Beta-Order MMSE Spectral Amplitude Estimation for Speech Enhancement," IEEE Transactions on Speech and Audio Processing, Vol.13, No.4, July 2005, pp457-486.
  18. I Y Soon and S N Koh, "Speech Enhancement Using Two Dimensional Fourier Transform," IEEE Transactions on Speech and Audio Processing, Vol. 11, No. 6,  November 2003, pp. 717-724.
  19. G Chen, S N Koh and I Y Soon, "Enhanced Itakura Measure based on Masking Properties of Human Auditory System," Signal Processing, Vol. 83, No. 6, June 2003, pp. 1445-1456.
  20. X B Liu and S N Koh, "Hybrid Symbol- and Bit-Based Source Controlled Channel Decoding for MELP Speech Parameters," IEEE Communications Letters, Vol. 7, No. 8, August 2003, pp. 394-396.
  21. X B Liu and S N Koh, "Simplification of soft-bit speech decoding and application to MELP encoded speech," IEE Electronics Letters, Vol. 39, No. 3, February 2003, pp. 332-333.
  22. I Y Soon, S N Koh, C K Yeo and W H Ngo, "Transformation of narrowband speech into wideband speech with aid of zero crossings rate," IEE Electronics Letters, November 2002, Vol. 38. No. 24.
  23. X B Liu, S N Koh and S Yoshida, "Error Concealment Using Residual Redundancy for MELP Parameter," IEICE Transactions on Information and Systems, Vol. E85-D, No. 5, May 2002, pp. 906-909.
  24. W Lin, S N Koh and X Lin , "An 8-/8-4-kbps Wideband Speech Coder Based on Mixed Excitation Linear Prediction," Signal Processing, Vol. 81, No. 7, Netherlands, July 2001, pp. 1437-1448.
  25. I Y Soon and S N Koh, "Low Distortion Speech Enhancement," IEE-Proceedings - Vision, Image and Speech Processing, Vol. 147, No. 3, UK, June 2000, pp. 247-253.
  26. C Chen, S N Koh and I Y Soon, "An Associatively Classified Partitioned Vector Quantizer," Signal Processing, Vol. 76, No. 3, Netherlands, 1999.
  27. I Y Soon, S N Koh and C H Yeo, "Improved noise suppresion filter using adaptive estimator of probability of speech absence," Signal Processing, Vol. 75, No. 2, Netherlands, 1999.
  28. C Chen, S N Koh and I Y Soon, "Fast codebook search algorithm for unconstrained vector quantization," IEE Proceedings - Vision, Image and Signal Processing,Vol. 145, No. 2, UK, April 1998, pp. 97-102.

Conference Papers

  1. X B Liu, S N Koh, X W Wu and C C Chui, "Investigation on Scrambler Reconstruction With Minimum A Priori Knowledge", accepted by Globecom, Houston, December 2011.
  2. S Zhao, K K Luke, S N Koh and Y Zhang, "Computer Aided Evaluation of Intonation for Language Learning Based on Prosodic Unit Segmentation", Proceedings of Asia Pacific Signal and Information Processing Association (APSIPA) Annual Summit and Conference, Singapore, December, 2010.
  3. X-W Wu, S N Koh, C-C Chui, "Primitive Polynomials for Robust Scramblers and Stream Ciphers Against Reverse Engineering", Proceedings, International Symposium on Information Theory, ISIT-2010, Austin, June, 2010.
  4. C H You, S N Koh, H Li and S Rahardja, "An Improved Adaptive Beta-order MMSE Speech Enhancement Method", Proceedings of Asia Pacific Signal and Information Processing Association Annual Summit and Conference, Sapporo, October, 2009.
  5. H Ding, I Y Soon, S N Koh and C K Yeo, "A Post-processing Technique for Regeneration of Over-attenuated Speech Components", Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, Taipei, April, 2009.
  6. T Li, S Rahardja and SN Koh, "A Fully Scalable Audio Coding Structure with Embedded Psychoacoustic Model" , Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, Las Vegas, April 2008.
  7. T Li, S Rahardja and SN Koh, "Efficient Stereo Bitrate Allocation for Fully Scalable Audio Codec", Proceedings of IEEE International Workshop on Multimedia Signal Processing MMSP2008, Cairns, Australia, October, 2008.
  8. C H You, S Rahardja and S N Koh, "Autoregressive Parameter Estimation for Kalman Filtering Speech Enhancement", Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, Honolulu, April 2007.
  9. T Li, S Rahardja and S N Koh, "Perceptually Prioritized Bit-plane Coding for High-definition Advanced Audio Coding", Proceedings of IEEE International Symposium on Multimedia, San Diego, December 2006.
  10. V G Reju, S N Koh and I Y Soon, "A Robust Correlation Method for Solving Permutation Problem in Frequency Domain Blind Source Separation of Speech Signals," Proceeding of Asia Pacific Conference on Circuits and Systems, Singapore, Dec 2006.
  11. C H You, S Rahardja and S N Koh, "Perceptual Kalman Filtering Speech Enhancement", Proc-IEEE International Conference on Acoustics, Speech and Signal Processing 2006, Toulouse, May 2006.
  12. V G Reju, S N Koh, I Y Soon and X Zhang, "Solving Permutation Problem in Blind Source Separation of Speech Signals: A Method Applicable for Collinear Sources", Proceedings ICICS2005, Bangkok, December 2005.
  13. C H You, S N Koh and R Susanto, "Signal Subspace Speech Enhancement for Audible Noise Reduction," Proc-IEEE International Conference on Acoustics, Speech and Signal Processing 2005, Philadelphia, March 2005.
  14. C H You, S N Koh and R Susanto , "An MMSE Speech Enhancement Approach Incorperating Masking Properties," Proc-IEEE International Conference on Acoustics, Speech and Signal Processing 2004, Montreal, May 2004.
  15. C You, S N Koh and R Susanto, "Adaptive Beta-Order MMSE Estimation for Speech Enhancement," Proc-IEEE International Conference on Acoustics, Speech and Signal Processing 2003, Hong Kong, April 2003.
  16. G Chen, S N Koh and I Y Soon, "Speech Enhancement Based on F-norm Constrained Truncated SVD Algorithm," Proc-IEEE Workshop on Digital Signal Processing 2003, Japan, April 2003.
  17. H Wang, S N Koh and G Shu, "Wideband Speech Coder Employing T-codes and Reversible Variable Length Codes," Proc-IEEE Workshop on Speech Coding, SCW 2002, Tsukuba, October 2002.
  18. G Shu and S N Koh, "Application of Variable Length List Viterbi Algorithm to the ITU-T ADPCM Coder," Proc-9th International Workshop on Systems, Signals and Image Processing, IWSSIP'02, Manchester, November 2002.