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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
- Effects of spatial cues on detectability of alarm signals in noisy environments, PRINCIPLES AND APPLICATIONS OF SPATIAL HEARING, Edited by Yoiti Suzuki, Douglas Brungart, Hiroaki Kato, Kazuhiro Iida, Densil Cabrera, & Yukio Iwaya，Naoki Kuroda, Junfeng Li, Yukio Iwaya, Masashi Unoki, and Masato Akagi，World Scientific,，2011，484-493
- "Effect of Presence of Cue Tone on Tuning of Auditory Filter Derived from Simultaneous Masking" (Chapter 12)Neurophysiological Bases of Auditory Perception，Shunsuke Kidani and Masashi Unoki，Springer，2010，121-130
- Temporal modulation normalization for robust feature extraction and recognition (chapter)Multimedia Tools and Applications，Xugang Lu, Shigeki Masuda, Masashi Unoki, and Satoshi Nakamura，Springer DOI 10.1007/s11042-010-0465-7，2010
◇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
◇Lectures and Presentations
- Speech Signal Processing Based on the Concept of Modulation Transfer Function，Masashi Unoki，Proc. 2012 IEEE Workshop o Nonlinear Signal Processing (NSP2012)，Community Plaza, Shikoku Univ. Tokushima，2012/26
- Digital audio watermarking based on cochlear delay characteristics，Masashi Unoki，The 3rd Workshop in Seoul, A3 Foresight Program，Seoul, South Korea，2012/07/1
- A modulation-transfer-function-based method for restoring sub-band power envelope from noisy reverberant speech，Shota Morita, Masashi Unoki, Xugang Lu, Yang Liu, Masato Akagi, and Ruediger Hoffmann，J. Acoust. Soc. Am., Vol. 131, No. 4, Pt. 2 (Proc. Acoustics 2012 Hong Kong, 5pAAb4)，Hong Kong，2012/05
■Extramural Activities
◇Academic Society Affiliations
- IEEE，Member，2007-
- Acoustical Society of America，Member，2005-
- European Association for Speech, Signal and Image Processing，Member，2004-
◇Other Activities
- ASJ，2007/05/01 -
- IEICE，2012/06/01 - 2013/05/31
- Acoustical Society of Japan，Editor，2007/05/22 - 2013/05/21
■Academic Awards Received
- Best Paper Award，IEEE IIHMSP2009，2009
- IEEE Ninth International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP-2012), Best Paper Award，IEEE IIHMSP2012，2012
- 2010 Sato Prize, award for outstanding papers，The Acoustical Society of Japan，2010