TOP Page >  Profile

Lab
情報研究棟IS Building Ｉ　9F
TEL：0761-51-1237
To Lab's Site
 
 

English

 

 

Masashi Unoki Associate Professor
School of Information Science（Department of Information Science・Human Information Processing）

■Degrees

M.S and Ph.D. from Japan Advanced Institute of Science and Technology (1996,1999)

■Professional Career

JSPS Research Fellow (DC2)(1998), Visiting researcher, ATR Human Information Processing Laboratories (1999), Visiting Associate, CNBH, Univ. of Cambridge (2000-2001), JSPS Research Fellow (PD)(1999-2001), Associate of School of Information Science at JAIST (2001-2005)

■Specialties

Modeling of auditory system, Computational Auditory Scene Analysis, Speech Signal Processing

■Research Keywords

Auditory filterbank, Auditory Scene Analysis, Speech dereverberation, Audio watermarking

■Research Interests

Construction of the auditory filterbank
The aim of this work is to construct the auditory filterbank that can account psycho-acoustical data and physiological data for frequency selectivity of the auditory system.
Computational Auditory Scene Analysis
The study of computational theory of the auditory system tries to answer the following questions:
Extraction of the fundamental frequency of speech in real environments
Extraction of the fundamental frequency (F0) of target speech is an important problem not only in speech analysis/synthesis but also in various speech signal processings such as speech segregation. Various F0 estimation methods have been proposed, but the most of these methods have the drawbacks for estimating accurate F0s of target speech in real environments. My approach is to construct an estimation model based on computational auditory scene analysis (CASA).
A study on the speech dereverberation method
To dereverberate the original signal from a reverberant signal is an important issue concerning speech signal processing such as preprocessing for speech recognition systems. Most of the inverse filtering methods have to measure the impulse response of the room acoustics to determine its inverse filter before the dereverberation. Moreover, the impulse response temporally varies with various environmental factors (temperature etc.), so the room acoustics have to be measured each time these methods are used. In this work, it has been trying to model a speech dereverberation based on the Modulation Transfer Function, without measuring the impulse response of room acoustics.

■Publications

◇Books

  • Nonlinear responses of a nonlinear cochlear model with the function of an outer hair cell modell, Concepts and Challenges in the Biophysics of Hearing, N. P. Cooper and D. T. Kemp Eds，Yasuki Murakami and Masashi Unoki，World Scientific, London，2009，343-349
  • Estimates of tuning of auditory filter using simultaneous and forward notched-noise masking, Hearing - from sensory processing to Perception by Kollmeier, B. et al.，Masashi Unoki, Ryota Miyauchi, and Chin-Tuan Tan，Springer Verlag, Heidelberg，2007，19-26
  • Comparison of the compressive-gammachirp and double-roex auditory filters，Roy D. Patterson, Masashi Unoki, and Toshio Irino，Auditory Signal Processing: physiology, psycholacoustics, and models, D. Pressnitzer et al. Eds. Springer-Verlag, New York，2004，21-29

Display All

◇Published Papers

  • Compparison of the roex and gammachirp filters as representations of the auditory filter，Masashi Unoki, Toshio Irino, Brian Glasberg, Brian C. J. Moore, and Roy D. Patterson，Journal of the Acoustical Society of America，120，3，1474-1492，2006/09/
  • Estimates of auditory filter shape using notched-noise masking for various signal frequencies，Masashi Unoki, Kazuhito Ito, Yuichi Ishimoto, and Chin-Tuan Tan，Acoustical Science and Technology，27，1，1-11，2006/01/
  • Estimates of tuning of auditory filter using simultaneous and forward-notched-noise masking，Masashi Unoki, Ryota Miyauchi, and Chin-Tuan Tan，Proc. ISH2006 (14th International Symposium on Hearing)，18-24，2006/08/18

Display All

◇Lectures and Presentations

  • Embedding limitations with audio-watermarking method based on cochlear delay characteristics，Kuniaki Imabeppu, Daiki Hamada, and Masashi Unoki，Fifth International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP-2009)，Kyoto Japan，2009/09
  • Method of Digital Audio/Speech Watermarking Based on Cochlear Delay Characteristics，Masashi Unoki，19th Czech-German Workshop Speech Processing，Institute of Physics of the Academy of Science, Czech，2009/09
  • MTF-based power envelope restoration in noisy reverberant environments，Masashi Unoki, Yutaka Yamasaki, and Masato Akagi，Proc. EUSIPCO2009, pp. 228-232，Glasgow, U. K.，2009/08

Display All

■Extramural Activities

◇Academic Society Affiliations

  • IEEE，Member，2007-
  • Acoustical Society of America，Member，2005-
  • European Association for Speech, Signal and Image Processing，Member，2004-

Display All

◇Other Activities

  • 2010 International Workshop on Nonlinear Circuits and Signal Processing (NCSP10)，Committee member，2009/04/01 - 2010/03/31
  • ISO/TC 43/WG 9 "METHOD FOR CALCULATING LOUDNESS LEVEL" (REVISION OF ISO 532:1975)，Japanese member，2007/05/01 - 2010/04/30
  • Acoustical Society of Japan，Editor，2007/05/22 - 2011/05/21

Display All

■Academic Awards Received

  • Best Paper Award，IEEE IIHMSP2009，2009
  • 2000 Sato Prize, award for outstanding papers，The Acoustical Society of Japan
© Japan Advanced Institute of Science and Technology 2007