Welcome to the homepage of Chr. Plahl, currently PhD student at the Chair of Computer Science 6, RWTH Aachen University, Germany.

• Pattern Recognition
• Human Language Technology
• Image Processing and Recognition

• Automatic speech recognition
• Image recognition

You can take a look at the full list of publications of the Chair.

List of publications

I don't like this color at all ;-)

Journal Papers and Reviewed Conference Papers

• C. Plahl. Neural Network based Feature Extraction for Speech and Image Recognition. PhD Thesis, Computer Science Department, RWTH Aachen University, Aachen, Germany, January 2014.
  

• C. Plahl, M. Kozielski, R. Schlüter, and H. Ney. Feature Combination and Stacking of Recurrent and Non-recurrent Neural Networks for LVCSR. In IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), pages 6714-6718, Vancouver, Canada, May 2013.
  

• Y. Gweth, C. Plahl, and H. Ney. Enhanced Continuous Sign Language Recognition using PCA and Neural Network Features. In CVPR 2012 Workshop on Gesture Recognition (CVPR 2012), pages 55-60, Providence, Rhode Island, USA, June 2012.
  
• C. Plahl, T. N. Sainath, B. Ramabhadran, and D. Nahamoo. Improved Pre-training of Deep Belief Networks using Sparse Encoding Symmetric Machines. In IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), pages 4165-4168 , Kyoto, Japan, March 2012.
  

• C. Plahl, R. Schlüter, and H. Ney. Cross-lingual Portability of Chinese and English Neural Network Features for French and German LVCSR. In IEEE Automatic Speech Recognition and Understanding Workshop (ASRU), pages 371-376, Waikoloa, HI, USA, December 2011.
  
• F. Valente, M. Magimai.-Doss, C. Plahl, S. Ravuri, and W. Wang. Transcribing Mandarin Broadcast Speech Using Multi-Layer Perceptron Acoustic Features. IEEE/ACM Transactions on Audio, Speech, and Language Processing, volume 19, number 8, pages 2439-2450 , November 2011.
  
• P. Dreuw, P. Doetsch, C. Plahl, and H. Ney. Hierarchical Hybrid MLP/HMM or rather MLP Features for a Discriminatively Trained Gaussian HMM: A Comparison for Offline Handwriting Recognition. In IEEE International Conference on Image Processing (ICIP), pages 3541-3544, Brussels, Belgium, September 2011.
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• Z. Tüske, C. Plahl, and R. Schlüter. A study on speaker normalized MLP features in LVCSR. In Interspeech, pages 1089-1092, Florence, Italy, August 2011.
  
• C. Plahl, R. Schlüter, and H. Ney. Improved Acoustic Feature Combination for LVCSR by Neural Networks. In Interspeech, pages 1237-1240, Florence, Italy, August 2011.
  
• M. Sundermeyer, M. Nußbaum-Thom, S. Wiesler, C. Plahl, A. El-Desoky Mousa, S. Hahn, D. Nolden, R. Schlüter, and H. Ney. The RWTH 2010 Quaero ASR Evaluation System for English, French, and German. In IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), pages 2212-2215, Prague, Czech Republic, May 2011.
  
• C. Plahl, B. Hoffmeister, R. Schlueter, and H. Ney. Multiple Feature Speech Recognition. In J. Olive, C. Christianson, and J. McCary (Edts.): Handbook of Natural Language processing and Machine Translation: DARPA Global Autonomous Language Exploitation (GALE) Chp. 3.2.4, pages 415-421, Springer, New York, NY, USA, 2011.
  

• C. Plahl, R. Schlüter, and H. Ney. Hierarchical Bottle Neck Features for LVCSR. In Interspeech, pages 1197-1200, Makuhari, Japan, September 2010.
  
• F. Valente, M. M. Doss, C. Plahl, S. Ravuri, and W. Wang. A Comparative Large Scale Study of MLP Features for Mandarin ASR. In Interspeech, pages 2630-2633, Makuhari, Japan, September 2010.
  
• M. Nußbaum-Thom, S. Wiesler, M. Sundermeyer, C. Plahl, S. Hahn, R. Schlüter, and H. Ney. The RWTH 2009 Quaero ASR Evaluation System for English and German. In Interspeech, pages 1517-1520, Makuhari, Japan, September 2010.
  

• M. A. Tahir, G. Heigold, C. Plahl, R. Schlüter, and H. Ney. Log-Linear Framework for Linear Feature Transformations in Speech Recognition. In IEEE Automatic Speech Recognition and Understanding Workshop (ASRU), pages 76-81, Merano, Italy, December 2009.
  
• C. Plahl, B. Hoffmeister, G. Heigold, J. Lööf, R. Schlüter, and H. Ney. Development of the GALE 2008 Mandarin LVCSR System. In Interspeech, pages 2107-2110, Brighton, UK, September 2009.
  
• F. Valente, M. Magimai.-Doss, C. Plahl, and S. Ravuri. Hierarchical Processing of the Modulation Spectrum for GALE Mandarin LVCSR System. In Interspeech, pages 2963-2966, Brighton, UK, September 2009.
  

• R. Schlüter, C. Gollan, S. Hahn, G. Heigold, B. Hoffmeister, J. Lööf, C. Plahl, D. Rybach, and H. Ney. Development of Large Vocabulary ASR Systems for Mandarin and Arabic. In ITG-Fachtagung Sprachkommunikation (Sprachkommunikation), Aachen, Germany, October 2008.
  
• C. Plahl, B. Hoffmeister, M. Hwang, D. Lu, G. Heigold, J. Lööf, R. Schlüter, and H. Ney. Recent Improvements of the RWTH GALE Mandarin LVCSR System. In Interspeech, pages 2426-2429, Brisbane, Australia, September 2008.
  

• B. Hoffmeister, C. Plahl, P. Fritz, G. Heigold, J. Lööf, R. Schlüter, and H. Ney. Development of the 2007 RWTH Mandarin LVCSR System. In IEEE Automatic Speech Recognition and Understanding Workshop (ASRU), pages 455-460 , Kyoto, Japan, December 2007.
  
• J. Lööf, C. Gollan, S. Hahn, G. Heigold, B. Hoffmeister, C. Plahl, D. Rybach, R. Schlüter, and H. Ney. The RWTH 2007 TC-STAR Evaluation System for European English and Spanish. In Interspeech, pages 2145-2148, Antwerp, Belgium, August 2007.
  
• F. Valente, J. Vepa, C. Plahl, C. Gollan, H. Hermansky, and R. Schlüter. Hierarchical Neural Networks Feature Extraction for LVCSR system. In Interspeech, pages 42-45, Antwerp, Belgium, August 2007.
  

• J. Lööf, M. Bisani, C. Gollan, G. Heigold, B. Hoffmeister, C. Plahl, R. Schlüter, and H. Ney. The 2006 RWTH Parliamentary Speeches Transcription System. In Interspeech, pages 105-108, Pittsburgh, PA, USA, September 2006.
  
• J. Lööf, M. Bisani, C. Gollan, G. Heigold, B. Hoffmeister, C. Plahl, R. Schlüter, and H. Ney. The 2006 RWTH Parliamentary Speeches Transcription System. In TC-STAR Workshop on Speech-to-Speech Translation, pages 133-138, Barcelona, Spain, June 2006.
  

• C. Plahl. Sprachsynthese mit Hidden Markov Modellen. Master Thesis, Bielefeld, September 2005.
  

Invited Talks

2012

• Lecture Introduction to Statistical Classification (winter semester 12/13)
  Special talk: Pattern Recognition and Neural Networks (12/05/2012)

2011

• Lecture Pattern Recognition and Neural Networks (winter semester 11/12)
  Special talk: Pattern Recognition and Neural Networks (01/18/2012)
• Proseminar Data Compression (winter semester 11/12), in cooperation with Patrick Lehnen

2010

• Proseminar Data Compression (winter semester 10/11)

2009

• Lab course Speech- and Image Processing (winter semester 09/10)
• Proseminar Data Compression (winter semester 09/10)
• Seminar Selected Topics in Human Language Technology and Pattern Recognition (summer semester 09)

2008

• Lab course Speech- and Image Processing (winter semester 08/09)
• Proseminar Data Compression (winter semester 08/09)
• Seminar Selected Topics in Pattern Recognition (summer semester 08)
• Lab course Pattern Classification and Image Recognition (summer semester 08)

2007

• Lab course Speech- and Image Processing (winter semester 07/08)
• Proseminar Data Compression (winter semester 07/08)
• Seminar Training Methods in Pattern Recognition (summer semester 07)

2006

• Lab course Speech- and Image Processing (winter semester 06/07)
• Proseminar Data Compression (winter semester 06/07)
• Seminar Automatic Speech Recognition (summer semester 06)
• Lecture Work Datastructures and Algorithms (summer semester 06)

2005

• Lab course Speech- and Image Processing (winter semester 05/06)