Youji IIGUNI


An Efficient Image to Sound Mapping Method Using Speech Spectral Phase and Multi-Column Image
Arata KAWAMURA Hiro IGARASHI Youji IIGUNI 
Publication:   
Publication Date: 2017/03/01
Vol. E100-A  No. 3  pp. 893-895
Type of Manuscript:  LETTER
Category: Digital Signal Processing
Keyword: 
spectrogramlong-time Fourier transformimage-to-sound mappingspectral phase
 Summary | Full Text:PDF(802KB)

A Zero Phase Noise Reduction Method with Damped Oscillation Estimator
Sayuri KOHMURA Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/10/01
Vol. E97-A  No. 10  pp. 2033-2042
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
noise reductionspeech enhancementimpact noisedamped oscillation
 Summary | Full Text:PDF(2.1MB)

An Adaptation Method for Morphological Opening Filters with a Smoothness Penalty on Structuring Elements
Makoto NAKASHIZUKA Yu ASHIHARA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/06/01
Vol. E96-A  No. 6  pp. 1468-1477
Type of Manuscript:  PAPER
Category: Image
Keyword: 
image recoverymathematical morphologyregularizationdenoising
 Summary | Full Text:PDF(1.7MB)

A Comb Filter with Adaptive Notch Gain and Bandwidth
Yosuke SUGIURA Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/04/01
Vol. E96-A  No. 4  pp. 790-795
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
comb filternotch gainnotch bandwidthNLMS algorithm
 Summary | Full Text:PDF(978KB)

An Adaptive Comb Filter with Flexible Notch Gain
Yosuke SUGIURA Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/11/01
Vol. E95-A  No. 11  pp. 2046-2048
Type of Manuscript:  Special Section LETTER (Special Section on Smart Multimedia & Communication Systems)
Category: Digital Signal Processing
Keyword: 
comb filteradaptive algorithmLMS
 Summary | Full Text:PDF(262.6KB)

Convergence Vectors in System Identification with an NLMS Algorithm for Sinusoidal Inputs
Yuki SATOMI Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/10/01
Vol. E95-A  No. 10  pp. 1692-1699
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
NLMS algorithmsinusoidal inputssystem identificationconvergence vector
 Summary | Full Text:PDF(1.2MB)

A Comb Filter Design Method Using Linear Phase FIR Filter
Yosuke SUGIURA Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/08/01
Vol. E95-A  No. 8  pp. 1310-1316
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
comb filterlinear phase FIR filterflexible frequency response
 Summary | Full Text:PDF(1MB)

Supervised Single-Channel Speech Separation via Sparse Decomposition Using Periodic Signal Models
Makoto NAKASHIZUKA Hiroyuki OKUMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/05/01
Vol. E95-A  No. 5  pp. 853-866
Type of Manuscript:  PAPER
Category: Engineering Acoustics
Keyword: 
signal representationsignal decompositionsparse representationharmonic analysissignal separation
 Summary | Full Text:PDF(895.8KB)

Stationary and Non-stationary Wide-Band Noise Reduction Using Zero Phase Signal
Weerawut THANHIKAM Yuki KAMAMORI Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/05/01
Vol. E95-A  No. 5  pp. 843-852
Type of Manuscript:  PAPER
Category: Engineering Acoustics
Keyword: 
zero phase signalnoise reduction
 Summary | Full Text:PDF(2MB)

Speech Enhancement Based on Real-Speech PDF in Various Narrow SNR Intervals
Weerawut THANHIKAM Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/03/01
Vol. E95-A  No. 3  pp. 623-630
Type of Manuscript:  PAPER
Category: Engineering Acoustics
Keyword: 
speech enhancementMAP estimationspeech spectral distribution
 Summary | Full Text:PDF(2MB)

A High Speech Quality Distance-Based Howling Canceller with Adaptive Cascade Notch Filter and Silent Pilot Signal
Akira SOGAMI Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2306-2314
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: Speech Processing
Keyword: 
howling cancelleradaptive filternotch filterpilot signal
 Summary | Full Text:PDF(2.9MB)

Moment Invariants of the Weighted Image
Ken-ichi SAKAUE Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2010/03/01
Vol. E93-D  No. 3  pp. 666-670
Type of Manuscript:  LETTER
Category: Image Recognition, Computer Vision
Keyword: 
moment invariantimage momentdiscrete imageinvariancy
 Summary | Full Text:PDF(1.2MB)

Shift-Invariant Sparse Image Representations Using Tree-Structured Dictionaries
Makoto NAKASHIZUKA Hidenari NISHIURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/11/01
Vol. E92-A  No. 11  pp. 2809-2818
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: Image Processing
Keyword: 
image decompositionimage representationsparse codingshape vector quantizationimage restoration
 Summary | Full Text:PDF(1.2MB)

Improvement of Speech Quality in Distance-Based Howling Canceller
Akira SOGAMI Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/04/01
Vol. E92-A  No. 4  pp. 1039-1046
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies Emerging Mainly from the 21st Workshop on Circuits and Systems in Karuizawa)
Category: 
Keyword: 
howling cancellerhigh speech qualityphase inversion signaladaptive bandwidth
 Summary | Full Text:PDF(741.8KB)

FOREWORD
Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/08/01
Vol. E91-A  No. 8  pp. 1857-1857
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(54.2KB)

Image Enlargement by Nonlinear Frequency Extrapolation with Morphological Operators
Masayuki SHIMIZU Makoto NAKASHIZUKA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/03/01
Vol. E91-A  No. 3  pp. 859-867
Type of Manuscript:  PAPER
Category: Image
Keyword: 
image enhancementimage enlargementLaplacian pyramidmorphologymorphological reconstruction
 Summary | Full Text:PDF(1007.7KB)

Speech Enhancement Based on MAP Estimation Using a Variable Speech Distribution
Yuta TSUKAMOTO Arata KAWAMURA Youji IIGUNI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/08/01
Vol. E90-A  No. 8  pp. 1587-1593
Type of Manuscript:  Special Section PAPER (Special Section on Papers Selected from the 21st Symposium on Signal Processing)
Category: 
Keyword: 
speech enhancementMAPspeech spectral distributionsuper-Gaussiannoise estimation
 Summary | Full Text:PDF(781.2KB)

An Adaptive Algorithm with Variable Step-Size for Parallel Notch Filter
Arata KAWAMURA Youji IIGUNI Yoshio ITOH 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/02/01
Vol. E89-A  No. 2  pp. 511-519
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
adaptive notch filtervariable step-sizeconvergence characteristicsfrequency estimation
 Summary | Full Text:PDF(985KB)

A Noise Reduction Method Based on Linear Prediction with Variable Step-Size
Arata KAWAMURA Youji IIGUNI Yoshio ITOH 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/04/01
Vol. E88-A  No. 4  pp. 855-861
Type of Manuscript:  Special Section PAPER (Special Section on Selected Papers from the 17th Workshop on Circuits and Systems in Karuizawa)
Category: 
Keyword: 
noise reductionlinear predictionvariable step-size
 Summary | Full Text:PDF(1.6MB)

A New Approach to Adaptive DOA Estimation Based upon a Database Retrieval Technique
Ivan SETIAWAN Youji IIGUNI Hajime MAEDA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/12/25
Vol. E83-B  No. 12  pp. 2694-2701
Type of Manuscript:  PAPER
Category: Antenna and Propagation
Keyword: 
DOAadaptive estimationk-d treerange searchroot-MUSIC
 Summary | Full Text:PDF(312.4KB)