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Osamu ICHIKAWA / 市川 治


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Advisory Researcher
Speech Technology, Information and Interaction,
IBM Research, Tokyo Research Laboratory


Contact Information
1623-14, Shimotsuruma, Yamato, Kanagawa 242-8502 Japan email


Osamu ICHIKAWA is an advisory researcher at the IBM Research - Tokyo and belongs to the speech technology group. He received B.E. and M.E. degrees in Aeronautical Engineering from Tokyo University, Japan, in 1986 and 1988, respectively, and a Ph.D. degree in Information Science from Nara Institute of Science and Technology, Japan, in 2008.

He joined IBM Japan, Yamato Laboratory in 1988. He worked on software development including operating systems, voice software, multimedia, system management and satellite broadcasting data delivery. From April 1999 to March 2001, he was a funded researcher at the Institute of Space and Astronautical Science in Sagamihara, Japan, for research on computational fluid dynamics. In 2001, he joined the IBM Tokyo Research Laboratory, Japan, working on signal processing for automatic speech recognition. His research interests include auditory speech processing, robust speech recognition, microphone arrays, acoustic echo cancellation, and computational fluid dynamics.

Dr. Ichikawa is a member of IEEE, the Acoustical Society of Japan and the Institute of Electronics, Information and Communication Engineers (IEICE).

Journal Papers and Letters

  • Osamu Ichikawa, Tetsuya Takiguchi and Masafumi Nishimura, "Speech enhancement by Profile Fitting method," IEICE Transaction, Special Issue on Speech Information Processing, Vol.E86D No.3, pp.514-521, 2003.
  • Osamu Ichikawa, Tetsuya Takiguchi and Masafumi Nishimura, "Sound source localization using a pinna-based Profile Fitting method," IEICE Transaction, Special Issue on Speech Dynamic by Ear, Eye, Mouth and Machine, Vol.E87-D No.5, pp.1138-1145, 2004.
  • Osamu Ichikawa and Masafumi Nishimura, "Simultaneous adaptation of echo cancellation and spectral subtraction for in-car speech recognition," IEICE Transaction, Special Section on Multi-channel Acoustic Signal Processing, Vol.E88A No.7, pp.1732-1738, 2005.
  • Osamu Ichikawa, Takashi Fukuda and Masafumi Nishimura, "Local peak enhancement for in-car speech recognition in noisy environment," IEICE Transaction, Special Section on Robust Speech Processing in Realistic Environments, Vol.E91D No.3, pp.635-639, 2008.
  • Osamu Ichikawa and Kozo Fujii, "Computation of the flow field around arbitrary three-dimensional body geometry using Cartesian grid," Transactions of the Japan Society of Mechanical Engineers. B, Vol.68 No.669, pp.1329-1336, 2002 (in Japanese).

International Conference Papers (peer-reviewed)

  • Osamu Ichikawa, Tetsuya Takiguchi and Masafumi Nishimura, "Sound source localization using a pinna-based Profile Fitting method," Proc. of International Workshop on Acoustic Echo and Noise Control (IWAENC) 2003, pp.263-266, 2003.
  • Osamu Ichikawa and Masafumi Nishimura, "Simultaneous adaptation of echo cancellation and spectral subtraction for in-car speech recognition," Proc. of European Conference on Speech Communication and Technology (EuroSpeech / InterSpeech) 2005, pp.2293-2296, 2005.
  • Osamu Ichikawa, Takashi Fukuda and Masafumi Nishimura, "Local peak enhancement combined with noise reduction algorithms for robust automatic speech recognition in automobiles," Proc. of IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) 2008, pp.4869-4872, 2008.
  • Osamu Ichikawa, Takashi Fukuda, and Masafumi Nishimura, "Dynamic Features in the Linear Domain for Robust Automatic Speech Recognition in a Reverberant Environment," Proc. of 11th European Conference on Speech Communication and Technology (Eurospeech / Interspeech)2009, 2009.