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Biography

Masashi Unoki was born in Akita, Japan on June 26, 1969. He Graduated the School of Information Engineer, the Polytechnic University in 1994. He received master degree (Information Science) from Japan Advanced Institute of Science and Technology (JAIST) in 1996. Since April 1996, he has been an doctoral program in the School of Information Science, Japan Advanced Institute of Science and Technology. His main research interests are in digital signal processing for acoustic signals and modeling of the auditory system. He is a member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan and the Acoustical Society of Japan (ASJ).
Masato Akagi was born in Okayama, Japan on September 12, 1956. He received a B.E. degree from Nagoya Institute of Technology in 1979, and M.E. and D.E. degrees from Tokyo Institute of Technology in 1981 and 1984, respectively. He joined the Electrical Communication Laboratories, Nippon Telegraph and Telephone Corporation (NTT) in 1984. From 1986 to 1990, he worked at the ATR Auditory and Visual Perception Research Laboratories. Since 1992, he has been with School of Information Science, Japan Advanced Institute of Science and Technology (JAIST) and now he is an Associate Professor of JAIST. His research interests include speech perception, modeling of speech perception mechanisms of humans, and signal processing of speech. During 1988, he joined the Research Laboratories of Electronics, MIT as a visiting researcher and in 1993, he studied at the Institute of Phonetic Science, Univ. of Amsterdam. Dr. Akagi is a member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan, the Acoustical Society of Japan (ASJ), the Institute of Electrical and Electronic Engineering (IEEE), the Acoustical Society of America (ASA), and the European Speech Communication Association (ESCA).

**Figure:** Wavelet analysis-system.
$\begin{figure} \begin{center} \epsfile{file=FIGURE/filterbank.eps,width=0.46\textwidth} \end{center}\end{figure}$

**Figure:** Impulse response and amplitude of gammatone filter ( f₀=600[Hz], N=4, b_f=22.9945).
$\begin{figure} \begin{center} \epsfile{file=FIGURE/gammatone.eps,width=0.46\textwidth} \end{center}\end{figure}$

**Figure:** Frequency characteristics of wavelet filterbank.
$\begin{figure} \begin{center} \epsfile{file=FIGURE/FBproperty.eps,width=0.46\textwidth} \end{center}\end{figure}$

**Figure:** Characteristics of adjacent auditory filters.
$\begin{figure} \begin{center} \epsfile{file=FIGURE/adjacent.eps,width=0.46\textwidth} \end{center}\end{figure}$

**Figure:** Signal segregation algorithm.
$% latex2html id marker 1671 \fbox{\footnotesize{ \begin{minipage}[h]{7cm} \begin... ...onstruct $\hat{f}_1(t)$\space and $\hat{f}_2(t)$ ; \end{tabbing}\end{minipage}}}$

**Figure:** Acoustic signals: f₁(t), m=0, f₂₁(t), and f₂₂(t).
$\begin{figure} \begin{center} \epsfile{file=FIGURE/original1-1.eps,width=0.46\te... ...e{file=FIGURE/original1-2.eps,width=0.46\textwidth} \end{center}\par\end{figure}$

**Figure:** Noise-added signals: f_M(t) and f_R(t).
$\begin{figure} \begin{center} \epsfile{file=FIGURE/mixsignal.eps,width=0.46\textwidth} \end{center} \end{figure}$

**Figure:** Amplitude envelope S_k(t) and output phase $\phi_k(t)$ (In the case of noise-added signal f_M(t)).
$\begin{figure} \begin{center} \epsfile{file=FIGURE/SkPhik.eps,width=0.46\textwidth} \end{center}\end{figure}$

**Figure:** dS_k(t)/dt and $d\phi_k(t)/dt$ (In the case of noise-added signal f_M(t)).
$\begin{figure} \begin{center} \epsfile{file=FIGURE/onset.eps,width=0.46\textwidth} \end{center}\end{figure}$

**Figure:** Extracted result (In the case of noise-added signal f_M(t)): $\hat{f}_1(t)$ and $\hat{f}_2(t)$ .
$\begin{figure} \begin{center} \epsfile{file=FIGURE/Extsignal.eps,width=0.46\textwidth} \end{center}\end{figure}$

**Figure:** Relationship between bandwidth and masking release.
$\begin{figure} \begin{center} \epsfile{file=FIGURE/SNR.eps,width=0.46\textwidth} \end{center}\end{figure}$

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Masashi Unoki
2000-10-26