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Our Researchers

October 24, 2024

Masanori Tsujikawa

Terumi Umematsu

Principal Researcher
Ph.D. in Engineering

Research area

  • Noise-Robust Speech Recognitioin
  • Physiological Information Understanding
  • Medical Information Processing

Papers

Doctoral Thesis

  • Masanori Tsujikawa, " A Study on Noise-Robust Speech Recognition and Its Application"，(2023-09, in Japanese).

Journal Papers

  • T. Umematsu, M. Tsujikawa, H. Sawada, "Real-time Stress Estimation Using Contactless Heart Rate Measurement Robust to Facial Movements," Information Processing Society of Japan (IPSJ) Journal, Vol.65, No.7, pp. 1150-1161, (2023-07, in Japanese).
  • M. Tsujikawa and Y. Kajikawa, "Low-Complexity and Accurate Noise Suppression Based on an A priori SNR Model for Robust Speech Recognition on Embedded Systems and Its Evaluation in a Car Environment," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E106-A, No. 9, pp. 1224-1233, (2023-09).
  • M. Tsujikawa, A. Sugiyama, K. Hanazawa, and Y. Kajikawa, "High-Performance In-Car Microphone Array System with a Front-Rear Microphone Arrangement," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. J106-A, No. 2, pp. 21-39, (2023-02, in Japanese).
  • K. Shibuya, T. Umematsu, K. Suzuki, T. Kitade, and M. Tsujikawa, "Verification of the Stress Process: Stressor Leading Chronic Stress in Working Time," Transaction of Human Interface Society, Vol.24, No.4, pp.205-214, (2022-11, in Japanese).
  • M. Tsujikawa, Y. Kajikawa, and Y. Nomura, "Identification of Third-Order Volterra Kernels by Frequency Response Method and Its Application to Loudspeaker Systems," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. J84-A, No. 11, pp. 1333-1345, (2001-11, in Japanese).
  • M. Tsujikawa, T. Shiozaki, Y. Kajikawa, and Y. Nomura, "Identification of Loudspeaker Systems Using Frequency Response Method – Effectiveness on Elimination of Second-Order Nonlinear Distortion-," Transactions of Acoustic Society of Japan, Vol. 56, No. 6, pp. 384-395, (2000-06, in Japanese). 

International Conference Papers

  • M. Tsujikawa, M. PhyoKhaing, "Camera-Position-Robust Drowsiness Estimation Based on Rotated-Facial-Video Augmentation," Proc. of IEEE EMBC 2024, Orlando, U.S.A., (2024-07).
  • T. Umematsu, M. Tsujikawa, K. Inagaki, Y. Shimizu, K. Shibata, K. Hijikata, H. Nakano, and T. Tanigawa, "Evaluation of Correlation between Psychomotor Vigilance Task Scores and Drowsiness Estimation Levels Obtained from Facial Videos," Proc. of IEEE EMBC 2023, Sydney, Australia, (2023-07).
  • M. Tsujikawa, A. Sugiyama, K. Hanazawa, and Y. Kajikawa, "Linear Microphone Array Parallel to the Driving Direction for In-Car Speech Enhancement," Proc. of IEEE ICASSP 2023, Rhodes Island, Greece, (2023-06).
  • T. Umematsu, M. Tsujikawa, and H. Sawada, "Evaluation of Cognitive Test Results Using Concentration Estimation from Facial Videos," Proc. of APSIPA 2022, Chiang Mai, Thailand, (2022-11).
  • M. Tsujikawa, T. Kitade, K. Shibuya, K. Suzuki, Y. Nakashima, T. Umematsu, A. Furukawa, and Y. Onishi, "NEC’s Chronic Stress Estimation System for Corporate Health," Workshop in IEEE EMBC 2022, Glasgow, U.K., (2022-07, Invited Talk).
  • M. Tsujikawa, T. Kitade, K. Suzuki, and K. Shibuya, "Accurate Chronic Stress Estimation with Personalized Models Based on Correlation Maximization," Proc. of IEEE EMBC 2022, Glasgow, U.K., (2022-07).
  • T. Kitade and M. Tsujikawa, "Development of a Real-Time Chronic Stress Visualization System from Long-Term Physiological Data," Proc. of IEEE EMBC 2022, Glasgow, U.K., (2022-07).
  • K. Shibuya and M. Tsujikawa, "Interactive Effects of Productivity and Work Engagement on the Mediation Analysis Using Chronic Stress As Explanatory Variable," Proc. of IEEE EMBC 2022, Glasgow, U.K., (2022-07).
  • T. Umematsu, M. Tsujikawa, and H. Sawada, "Simultaneous Estimation of Drowsiness, Focus and Stress from Facial Videos Captured by Smartphones," Proc. of IEEE EMBC 2021, Virtual, (2021-07).
  • T. Umematsu, A. Sano, S. Taylor, M. Tsujikawa, and R. Picard, "Forecasting stress, mood, and health from daytime physiology in office workers and students," Proc. of IEEE EMBC 2020, Virtual, (2020-07).
  • Y. Nakashima, T. Umematsu, M. Tsujikawa, and Y. Onishi, "An Effectiveness Comparison between the Use of Activity State Data and That of Activity Magnitude Data in Chronic Stress Recognition," Proc. of Workshops of 8th Intl. Conference on Affective Computing & Intelligent Interaction (ACII 2019), Cambridge, U.K., (2019-09).
  • T. Kogo, M. Tsujikawa, Y. Kiuchi, A. Nishino, and S. Hashimoto, "Model Predictive Control of Shallow Drowsiness: Improving Productivity of Office Workers," Proc. of IEEE EMBC 2019, Berlin, Germany, (2019-07).
  • Z. Yawen, M. Tsujikawa, and Y. Onishi, "Sleep/wake Classification Via Remote PPG Signals," Proc. of IEEE EMBC 2019, Berlin, Germany, (2019-07).
  • M. Tsujikawa, K. Okabe, K. Hanazawa, and Y. Kajikawa, "Automatic Speech Translation System Selecting Target Language by Direction-of-Arrival Information," Proc. of European Signal Processing Conference (EUSIPCO 2018), Rome, Italy., (2018-09).
  • M. Tsujikawa, Y. Onishi, Y. Kiuchi, T. Ogatsu, A. Nishino, and S. Hashimoto, "Drowsiness Estimation from Low-Frame-Rate Facial Videos using Eyelid Variability Features," Proc. of IEEE EMBC 2018, Hawaii, U.S.A., (2018-07).
  • M. Sun, M. Tsujikawa, Y. Onishi、X. Ma, A. Nishino, S. Hashimoto, "A neural-network-based investigation of eye-related movements for accurate drowsiness estimation," Proc. of IEEE EMBC 2018, Hawaii, U.S.A., (2018-07).
  • Y. Nakashima, M. Tsujikawa, and Y. Onishi, "Improvement in Chronic Stress Level Recognition by Using Both Long-Term and Short-Term Measurements of Physiological Features," Proc. of IEEE EMBC 2018, Hawaii, U.S.A., (2018-07).
  • T. Umematsu and M. Tsujikawa, "Head-Motion Robust Video-Based Heart Rate Estimation Using Facial Feature Point Fluctuations," Proc. of IEEE EMBC 2018, Hawaii, U.S.A., (2018-07).
  • U. Sharma, T. Umematsu, M. Tsujikawa, and Y. Onishi, "Adaptive Heart Rate Estimation from Face Videos," Proc. of IEEE EMBC 2018, Hawaii, U.S.A., (2018-07).
  • T. Umematsu and M. Tsujikawa, "Heart Rate Estimation from Facial Videos Based on ICA with Reference," Proc. of IEEE EMBC 2017, Jeju, Korea, (2017-07).
  • T. Umematsu, S. Komeiji, M. Tsujikawa, and R. Isotani, "Sudden-noise Suppression with Strike-portion Detection Based on Phase Linearity for Speech Recognition," Proc. of APSIPA 2016, Jeju, Korea, W09, (2016-12).
  • T. Arakawa, H. Al-Hassanieh, M. Tsujikawa, and R. Isotani, "Extended Minimum Classification Error Training in Voice Activity Detection," Proc. of IEEE Workshop on ASRU 2009, Merano, Italy, pp.232-236, (2009-12).
  • M. Tsujikawa, T. Arakawa, and R. Isotani, "In-Car Speech Recognition Using Model-Based Wiener Filter and Multi-Condition Training," Proc. of INTERSPEECH 2008, Brisbane, Australia, pp.972-975, (2008-09).
  • T. Arakawa, M. Tsujikawa, and R. Isotani, "Model-Based Wiener Filter for Noise Robust Speech Recognition," Proc. of IEEE ICASSP 2006, Toulouse, France, pp.537-540, (2006-05).
  • M. Tsujikawa, and K. Iso, "Hands-Free Speech Recognition Using Blind Source Separation Post Processed by Two-Stage Spectral Subtraction," Proc. of INTERSPEECH 2004, Jeju Island, Korea, ThB1702p.9, (2004-09).
  • M. Tsujikawa, Y. Kajikawa, and Y. Nomura, "Summational Complex NLMS Algorithm for Frequency-Domain Adaptive Volterra Filters," Proc. of the 2001 IEEE-EURASIP Nonlinear Signal and Image Processing Workshop, Maryland, U.S.A., (2001-06).
  • M. Tsujikawa, Y. Kajikawa, and Y. Nomura, "Identification of Third-order Volterra Kernels by Multi-sinusoidal Waves and Its Application to Loudspeaker Systems," Proc. of the International Workshop on Signal Processing Applications and Technology, Tokyo, Japan, pp. 147-150, (2000-10).
  • M. Tsujikawa, T. Shiozaki, Y. Kajikawa, and Y. Nomura, "Identification and Elimination of Second-order Nonlinear Distortion of Loudspeaker Systems Using Digital Volterra Filter," Proc. of European Signal Processing Conference (EUSIPCO 2000), Tampere, Finland, FPP1-4, (2000-09).
  • M. Tsujikawa, T. Shiozaki, Y. Kajikawa, and Y. Nomura, "Identification and Elimination of Second-order Nonlinear Distortion of Loudspeaker Systems Using Volterra Filter," Proc. of the 2000 IEEE International Symposium on Circuits and Systems (ISCAS2000), Geneva, Switzerland, Vol. 5, pp. 249-252, (2000-05).

Awards/Prizes

  • 2001: IEICE Young Researcher's Award
  • 2016: IEICE Engineering Sciences Society Service Award
  • 2019: IEICE LOIS (Life Intelligence and Office Information Systems) Research Award
  • 2024: Information Processing Society of Japan(IPSJ) Journal, Specially Selected Paper
  • 2024: the Minister of Education, Culture, Sports, Science and Technology Award -- the top award of the Electric Science and Technology Encouragement Awards

Academic society, communicty, etc.

  • IEICE member
  • IEEE member
  • June 2014 to May 2016: Secretary for IEICE technical group on signal processing
  • June 2014 to May 2016: Editorial committee member for the journal of IEICE
  • June 2017 to May 2018: Editorial committee member for the journal of IEICE Engineering Sciences Society

Patents (Issued ones only)

US Patent

  • M. Tsujikawa，"Drowsiness estimating device, drowsiness estimating method, and drowsiness estimating program recording medium"，US Patent No.11589787 (2023/02/28)
  • S. Emoto，A. Nishino，S. Hashimoto，S. Hori，J. Nakase，M. Tsujikawa，Y. Kiuchi，T. Ogatsu，"Environmental apparatus controller with learning control based on user condition"，US Patent No.11326801 (2022/05/15)
  • M. Tsujikawa，R. Isotani，"Noise suppression system, noise suppression method, and recording medium storing program"，US Patent No.10748551 (2020/08/18)
  • S. Komeiji, M. Tsujikawa，R. Isotani，"Speech processing apparatus, speech processing method, and recording medium"，US Patent No.10347273 (2019/07/09)
  • M. Tsujikawa，R. Isotani，"Signal processing apparatus, signal processing method, and signal processing program"，US Patent No.10043532 (2018/08/07)
  • M. Tsujikawa，A. Sugiyama，"Speech processing system, vehicle, speech processing unit, steering wheel unit, speech processing method, and speech processing program"，US Patent No.10026414 (2018/07/17)
  • M. Tsujikawa，K. Hanazawa，A. Sugiyama，"Speech input apparatus, speech processing method, speech processing program, ceiling member, and vehicle"，US Patent No.09972336 (2018/05/15)
  • M. Tsujikawa，K. Hanazawa，A. Sugiyama，"Speech processing system, speech processing method, speech processing program, vehicle including speech processing system on board, and microphone placing method"，US Patent No.09905243 (2018/02/27)
  • M. Tsujikawa，K. Hanazawa，A. Sugiyama，"Speech processing apparatus, speech processing method, speech processing program, method of attaching speech processing apparatus, ceiling member, and vehicle "，US Patent No.09847091 (2017/12/19)
  • T. Arakawa，M. Tsujikawa，"NOISE SUPPRESSION SYSTEM，METHOD，AND PROGRAM"，US Patent No.09613631 (2017/04/04)
  • M. Tsujikawa，K. Hanazawa，S. Komeiji，"NOISE REDUCTION SYSTEM，SPEECH DETECTION SYSTEM，SPEECH RECOGNITION SYSTEM，NOISE REDUCTION METHOD，AND NOISE REDUCTION PROGRAM"，US Patent No.09449616 (2016/09/20)
  • M. Tsujikawa，S. Tsukada，E. Takada，"VOICE INPUT/OUTPUT DEVICE，METHOD AND PROGRAMME FOR PREVENTING HOWLING"，US Patent No.09355648 (2016/05/31)
  • M. Tsujikawa，T. Emori，Y. Onishi，"METHOD FOR PROCESSING MULTICHANNEL ACOUSTIC SIGNAL，SYSTEM THEREFOR，AND PROGRAM"，US Patent No.09064499 (2015/06/23)
  • M. Tsujikawa，R. Isotani，T. Emori，Y. Onishi，"METHOD FOR PROCESSING MULTICHANNEL ACOUSTIC SIGNAL，SYSTEM THEREFOR，AND PROGRAM"，US Patent No.09009035 (2015/04/14)
  • M. Tsujikawa，T. Emori，Y. Onishi，R. Isotani，"METHOD FOR PROCESSING MULTICHANNEL ACOUSTIC SIGNAL，SYSTEM THEREFOR，AND PROGRAM"，US Patent No.08954323 (2015/02/10)
  • T. Arakawa，M. Tsujikawa，"VOICE ACTIVITY DETECTOR，VOICE ACTIVITY DETECTION PROGRAM，AND PARAMETER ADJUSTING METHOD"，US Patent No.08938389 (2015/01/20)
  • T. Emori，M. Tsujikawa，"SPEECH SOUND DETECTION APPARATUS"，US Patent No.08856001 (2014/10/07)
  • T. Emori，M. Tsujikawa，"SIGNAL CORRECTION APPARATUS"，US Patent No.08842843 (2014/09/23)
  • T. Arakawa，M. Tsujikawa，"VOICE ACTIVITY DETECTOR，VOICE ACTIVITY DETECTION PROGRAM，AND PARAMETER ADJUSTING METHOD"，US Patent No.08812313 (2014/08/19)
  • T. Arakawa，M. Tsujikawa，"SYSTEM，METHOD AND PROGRAM FOR VOICE DETECTION"，US Patent No.08694308 (2014/04/08)
  • T. Arakawa，M. Tsujikawa，K. Hanazawa，"VOICE RECOGNITION DEVICE，VOICE RECOGNITION METHOD，AND VOICE RECOGNITION PROGRAM"，US Patent No.08612225 (2013/12/17)
  • T. Emori，M. Tsujikawa，"DEVICE，METHOD AND PROGRAM FOR VOICE DETECTION AND RECORDING MEDIUM"，US Patent No.08589152 (2013/11/19)
  • T. Arakawa，M. Tsujikawa，"GAIN CONTROL SYSTEM，GAIN CONTROL METHOD，AND GAIN CONTROL PROGRAM"，US Patent No.08401844 (2013/03/19)
  • M. Tsujikawa，"SYSTEM，METHOD，DEVICE，AND PROGRAM FOR REMOVING ONE OR MORE SIGNALS INCOMING FROM ONE OR MORE DIRECTIONS"，US Patent No.07925504 (2011/04/12)

Academic/professional career summary

Education

March 1999
B.E. degree in electrical engineering, Kansai University
March 2001
M.E. degree in electrical engineering, Kansai University
September 2023
Ph.D. degree in electrical, electronic and information engineering, Kansai University

Work Experience

April 2001
Multimedia Research Laboratories, NEC Corporation
September 2020 to Current
Part-time lecturer, Tokyo Institute of Technology
Current
Generative AI Technology Development Department and Biometrics Research Laboratories, NEC Corporation

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