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Janus Recognition Toolkit

The Janus Recognition Toolkit (JRTk) is a general-purpose speech recognition toolkit developed at the Interactive Systems Labs at Carnegie Mellon University and Karlsruhe Institute of Technology. Commercial and research liscenses are available.

Introduction

The Janus Recognition Toolkit (JRTk) is a general-purpose speech recognition toolkit useful for both research and application development and is part of the JANUS speech-to-speech translation system.

The JRTk provides a flexible Tcl/Tk script based environment which enables researchers to build state-of-the-art speech recognizers and allows them to develop, implement, and evaluate new methods. It implements an object oriented approach that unlike other toolkits is not a set of libraries and precompiled modules but a programmable shell with transparent, yet efficient objects.

Since version 5 JRTk features the IBIS decoder, a one-pass decoder that is based on a re-entrant single pronunciation prefix tree and makes use of the concept of linguistic context polymorphism. It is therefore able to incorporate full linguistic knowledge at an early stage. It is possible to decode in one pass, using the same engine in combination with a statistical n-gram language model as well as context- free grammars. It is also possible to use the decoder to rescore lattices in a very efficient way.

Features

JRTk features state-of-the art techniques for pre-processing, acoustic modeling, and search.

Acoustic Pre-Processing

  • Processing of various, frequent audio formats
  • Flexible short-term fourier analysis
  • Flexibly configurable Mel-frequency scaled cepstral coefficients calculation
  • Minimimum variance distortion response processing
  • LPC processing
  • Mean and variance normalization

Acoustic Modeling

  • EM Training, label training, Viterbi training
  • incremental growing of Gaussians
  • Semi-tied covariances
  • MMIE training, bMMIE training
  • Speaker adaptive training

Decoding

  • Single pass decoder
  • Flexible language model interface for n-gram language models and grammars
  • lattice generation and manipulation
  • lattice rescoring
  • consensus decoding
  • confusion network combination

Projects

The JRTk is used for speech recognition in many on-going projects as well as past ones.

Current Projects

Past Projects

License Information

The JRTk is liscensed by Carnegie Mellon University. Commercial as well as research liscenses are available. Terms and conditions as well as further information can be inquired by contacting Prof. Alex Waibel at ahwPny0∂cs cmu edu.

Publications

JRTk Articles
Title Author Source

Torsten Zeppenfeld, Michael Finke, Klaus Ries, Martin Westphal, Alex Waibel 

International Conference on Acoustics, Speech, and Signal Processing 1997, ICASSP 1997, Munich, Germany, 01. April 1997 

Thomas Polzin, Noah Coccaro, N. Aoki-Waibel, Monika Woszczyna, M. Tomita, J. Tsutsumi, Ivica Rogina, Carolyn Rose, Alex Waibel, Arthur McNair, Alon Lavie, A. Eisele, Tilo Sloboda, Wayne Ward 

European Conference on Speech Communication and Technology 1993, Eurospeech 1993, Berlin, Germany, 26. January 1993 

Puming Zhan, Klaus Ries, Marsal Gavalda, Donna Gates, Alon Lavie, Alex Waibel 

4th International Conference on Spoken Language Processing 1996, ICSLP 1996, Philadelphia, USA, 01. October 1996 

Monika Woszczyna, N. Aoki-Waibel, Finn Dag Buø, Noah Coccaro, Keiko Horiguchi, Thomas Kemp, Alon Lavie, Arthur McNair, Thomas Polzin, Ivica Rogina, Carolyn Rose, Tanja Schultz, Bernhard Suhm, M. Tomita, Alex Waibel 

International Conference on Acoustics, Speech, and Signal Processing 1994, ICASSP 1994, Adelaide, Australia, 01. April 1994 

Louise Osterholtz, Joe Tebelskis, Ivica Rogina, Hiroaki Saito, Charles Augustine, Arthur McNair, Alex Waibel, Monika Woszczyna, Tilo Sloboda 

IEEE International Conference on Acoustics, Speech, and Signal Processing 1992, ICASSP 1992, San Francisco, USA, 26. January 1992 

Hagen Soltau, Florian Metze, Christian Fügen, Alex Waibel

Automatic Speech Recognition and Understanding Workshop 2001, ASRU 2001, Trento, Italy, 25. October 2011

Donna Gates, Alon Lavie, Lori Levin, Alex Waibel, Marsal Gavalda, Laura Tomokiyo, Monika Woszczyna, Puming Zhan 

12th European Conference on Artificial Intelligence, ECAI 1996, Budapest, Hungary, 01. August 1996 

Bernhard Suhm, Petra Geutner, Thomas Kemp, Alon Lavie, Laura Tomokiyo, Arthur McNair, Ivica Rogina, Tanja Schultz, Tilo Sloboda, Wayne Ward, Monika Woszczyna, Alex Waibel 

01. January 1995 

Alon Lavie, Alex Waibel, Lori Levin, Michael Finke, Donna Gates, Marsal Gavalda, Torsten Zeppenfeld, Puming Zhan 

International Conference on Acoustics, Speech, and Signal Processing 1997, ICASSP 1997, Munich, Germany, 01. April 1997 

Alon Lavie, Alex Waibel, Lori Levin, Donna Gates, Marsal Gavalda, Torsten Zeppenfeld, Puming Zhan, Oren Glickman 

4th International Conference on Spoken Language Processing 1996, ICSLP 1996, Philadelphia, USA, 01. October 1996 

Alex Waibel, Michael Finke, Donna Gates, Marsal Gavalda, Thomas Kemp, Alon Lavie, Lori Levin, Uwe Meier, Laura Tomokiyo, Arthur McNair, Ivica Rogina, Kaori Shima, Tilo Sloboda, Monika Woszczyna, Torsten Zeppenfeld, Puming Zhan 

IEEE International Conference On Acoustics, Speech And Signal Processing 1996, ICASSP 1996, Atlanta, USA, 01. May 1996