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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 - as the first author

  • Osamu Ichikawa, Takashi Fukuda and Masafumi Nishimura, "Dynamic features in the linear-logarithmic hybrid domain for automatic speech recognition in a reverberant environment," IEEE Journal of Selected Topics in Signal Processing, pp.816-823, 2010.
  • Osamu Ichikawa, Takashi Fukuda and Masafumi Nishimura, "DOA estimation with Local-Peak-Weighted CSP," EURASIP Journal on Advances in Signal Processing갅Volume 2010, Article ID 358729, 9 pages, 2010.
  • 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 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, 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, 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 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) - as the first author

  • 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.
  • 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 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, 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.

Domestic Conference Papers (in Japanese) - as the first author

  • 市川 治, 福田 隆, 西村雅 史, "音声認識における母音区間の位相の安定性の利用," 日本音響学会2010年秋期研究発表会講演論文集, 1-Q-7, pp. 127-130, 2010.
  • 市川 治, 福田 隆, 西村雅 史, "残響にロバストな音声認識のための動的特徴量と調波構造重み付けメルフィルタバンク," 日本音響学会講2010年春季研究発表会講演論文集, 1-6-1, pp.1-4, 2010.
  • 市川 治, 福田 隆, 西村雅 史, "残響にロバストな音声認識のための動的特徴量," 日本音響学会講2009年秋季研究発表会講演論文集, 1-1-9, pp.27-30, 2009.
  • 市川 治, 福田 隆, 西村雅 史, "Local Peak Weighted CSP による方向推定の改善," 日本音響学会講2008年秋季研究発表会講演論文集, 3-P-26, pp.821-822, 2008.
  • 市川 治, 福田 隆, 西村雅 史, "調波構造のローカルピーク強調によるF0抽出不要な音声強調法," 日本音響学会講2007年秋季研究発表会講演論文集, 1-P-24, pp.185-186, 2007.
  • 市川 治, 西村 雅史, "自動車内音声認識のためのスペクトルサブトラクションとエコーキャンセラの同時適応法,"日本音響学会講2005年春季研究発表会講演論文集, Vol.I, 2-Q-10, pp.117-118, 2005.
  • 市川 治, 滝口 哲也, 西村 雅史, "ランクベーススペクトル サブトラクション法によるミュージカルノイズ低減,"日本音響学会講2004年春季研究発表会講演論文集, Vol.I, 2-8-17, pp.93-94, 2004.
  • 市川 治, 滝口 哲也, 西村 雅史, "耳介付きプロファイル・フィッティング音源位置推定法の残響環境での評価," 日本音響学会講2003年秋季研究発表会講演論文集, Vol.I, 1-5-14, pp.505-506, 2003.
  • 市川 治, 滝口 哲也, 西村 雅史, "プロファイル・フィッティング法による音源位置推定," 日本音響学会講2003年春季研究発表会講演論文集, Vol.I, 2-8-18, pp.687-688, 2003.
  • 市川 治, 西村 雅史, "PC 上で実時間動作可能な２チャンネル ビームフォーマの実装," 日本音響学会講2002年秋季研究発表会講演論文集, Vol.I, 3-Q-6, pp.165-166, 2002.
  • 市川 治, 滝口 哲也, 西村 雅史, "ビーム形状に注目した音声強調処理," 日本音響学会講2002年春季研究発表会講演論文集, Vol.I, 2-2-7, pp.69-70, 2002.

Journal Papers and Letters - as the coauthor

  • Takashi Fukuda, Osamu Ichikawa, and Masafumi Nishimura, "Long-term Spectro-temporal and Static Harmonic Features for Voice Activity Detection," IEEE Journal of Selected Topics in Signal Processing，pp. 834-844, 2010.
  • 倉田 岳人, 市川 治, 西村 雅史,"ユーザの発話傾向分析に基づく車載機器操作のための音声入力手法の検討," 電子情報通信学会論文誌, Vol.J93-D, No.10, October 2010 (in Japanese).

International Conference Papers - as the coauthor

  • Takashi Fukuda, Osamu Ichikawa, and Masafumi Nishimura, "Improved Voice Activity Detection Using Static Harmonic Features," Proc. of 2010 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2010), pp.4482-4485, March 2010, Dallas, Texas, USA.
  • Takashi Fukuda, Osamu Ichikawa, and Masafumi Nishimura, "Short- and Long-term Dynamic Features for Robust Speech Recognition," Proc of 10th International Conference on Spoken Language Processing (ICSLP 2008 / Interspeech 2008), pp.2262-2265, September 2008, Brisbane, Australia.
  • Takashi Fukuda, Osamu Ichikawa, and Masafumi Nishimura, "Phone-duration-dependent Long-term Dynamic Features for Stochastic Model-based Voice Activity Detection," Proc of 10th International Conference on Spoken Language Processing (ICSLP 2008 / Interspeech 2008), pp.1293-1296, September 2008, Brisbane, Australia.
  • Sabine Deligne, Satya Dharanipragada and Osamu Ichikawa, "Robust speech recognition with Multi-channel Codebook Dependent Cepstral Normalization (MCDCN)," Proc. of International Congress on Acoustics (ICA) 2004, pp.IV2599-IV2602, 2004.