Osamu Ichikawa  Osamu Ichikawa photo       

contact information

Research Staff Member
Tokyo Research Laboratory, Japan
  +81dash3dash3808dash5236

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2017

Factorial Modeling for Effective Suppression of Directional Noise
Osamu Ichikawa, Takashi Fukuda, Gakuto Kurata, Steven J. Rennie
Proc. of 18th Annual Conference on the International Speech Communication Association (Interspeech 2017)
(errata) http://researcher.ibm.com/researcher/files/jp-ICHIKAW/FM_errata_and_update.pdf

Improving Feature-space Discriminative Training and Adaptation Using Regularization Process
Takashi Fukuda, Osamu Ichikawa, and Ryuki Tachibana
IPSJ Journal Vol.58(No.1), pp.288-296, 2017

Effective Joint Training of Denoising Feature Space Transforms and Neural Network Based Acoustic Models
Takashi Fukuda, Osamu Ichikawa, Gakuto Kurata, Ryuki Tachibana, Samuel Thomas, Bhuvana Ramabhadran
proc. of ICASSP, pp. pp. 5190-5194, 2017

Harmonic Feature Fusion for Robust Neural Network-based Acoustic Modeling
Osamu Ichikawa, Takashi Fukuda, Masayuki Suzuki, Gakuto Kurata and Bhuvana Ramabhadran
proc. of ICASSP, pp. pp. 5195-5199, 2017


2016

Convolutional Neural Network Pre-trained with Projection Matrices on Linear Discriminant Analysis
Takashi Fukuda, Osamu Ichikawa, and Ryuki Tachibana
Proc. of 2016 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2016)

Speech corpus recycling for acoustic cross-domain environments for automatic speech recognition.
Osamu Ichikawa, Steven J. Rennie, Takashi Fukuda, and Daniel Willett
Acoustical Science and Technology 37(2), 55-65, 2016


2015

Effective speech suppression using a two-channel microphone array for privacy protection in face-to-face sales monitoring
Osamu Ichikawa, Takashi Fukuda, and Ryuki Tachibana
Acoustical Science and Technology (Special Issue on Applied System), 507-515, 2015


2014

Regularized Feature-space Discriminative Adaptation for Robust ASR
Takashi Fukuda, Osamu Ichikawa, Masafumi Nishimura, Steven J. Rennie, and Vaibhava Goel
Proc. of 15th Annual Conference on the International Speech Communication Association (Interspeech 2014), pp. pp.2185-2188


2013

Channel-mapping for speech corpus recycling
O. Ichikawa, S.J. Rennie, T. Fukuda, M. Nishimura
Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on, pp. 7160-7164


2012

Model-based noise reduction leveraging frequency-wise confidence metric for in-car speech recognition
O. Ichikawa, S.J. Rennie, T. Fukuda, M. Nishimura
Acoustics, Speech and Signal Processing (ICASSP), 2012 IEEE International Conference on, pp. 4921--4924


2011


Breath-detection-based Telephony Speech Phrasing
T. Fukuda, O. Ichikawa, M. Nishimura
Twelfth Annual Conference of the International Speech Communication Association, 2011


2010

Speech Input Method in Automobiles Reflecting Analysis on How Users Speak
G. Kurata, O. Ichikawa, M. Nishimura
The IEICE transactions on information and systems J93-D(10), 2107-2117, 2010

Dynamic Features in the Linear-Logarithmic Hybrid Domain for Automatic Speech Recognition in a Reverberant Environment
O. Ichikawa, T. Fukuda, M. Nishimura
Selected Topics in Signal Processing, IEEE Journal of 4(5), 816--823, IEEE, 2010

Long-term spectro-temporal and static harmonic features for voice activity detection
T. Fukuda, O. Ichikawa, M. Nishimura
Selected Topics in Signal Processing, IEEE Journal of 4(5), 834--844, IEEE, 2010

DOA estimation with local-peak-weighted CSP
O. Ichikawa, T. Fukuda, M. Nishimura
EURASIP Journal on Advances in Signal Processing2010, 3, Hindawi Publishing Corp.

Improved voice activity detection using static harmonic features
T. Fukuda, O. Ichikawa, M. Nishimura
Acoustics Speech and Signal Processing (ICASSP), 2010 IEEE International Conference on, pp. 4482--4485


2009

Dynamic Features in the Linear Domain for Robust Automatic Speech Recognition in a Reverberant Environment
O. Ichikawa, T. Fukuda, R. Tachibana, M. Nishimura
Tenth Annual Conference of the International Speech Communication Association, 2009


2008


Local Peak Enhancement for In-Car Speech Recognition in Noisy Environment
O. Ichikawa, T. Fukuda, M. Nishimura
IEICE transactions on information and systems 91(3), 635--639, The Institute of Electronics, Information and Communication Engineers, 2008

Short-and long-term dynamic features for robust speech recognition
T. Fukuda, O. Ichikawa, M. Nishimura
Ninth Annual Conference of the International Speech Communication Association, 2008

Local peak enhancement combined with noise reduction algorithms for robust automatic speech recognition in automobiles
O. Ichikawa, T. Fukuda, M. Nishimura
Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on, pp. 4869--4872

Phone-duration-dependent long-term dynamic features for a stochastic model-based voice activity detection
T. Fukuda, O. Ichikawa, M. Nishimura
Ninth Annual Conference of the International Speech Communication Association, 2008


2005

Simultaneous adaptation of echo cancellation and spectral subtraction for in-car speech recognition
O. Ichikawa, M. Nishimura
IEICE transactions on fundamentals of electronics, communications and computer sciences 88(7), 1732--1738, The Institute of Electronics, Information and Communication Engineers, 2005


2004

Robust speech recognition with Multi-channel Codebook Dependent Cepstral Normalization (MCDCN)
Sabine Deligne, Satya Dharanipragada, Osamu Ichikawa
International Congress on Acoustics (ICA), pp. 2599-2602, 2004

Sound source localization using a profile fitting method with sound reflectors
O. Ichikawa, T. Takiguchi, M. Nishimura
IEICE TRANSACTIONS on Information and Systems 87(5), 1138--1145, The Institute of Electronics, Information and Communication Engineers, 2004


2003

Speech enhancement by profile fitting method
O. Ichikawa, T. Takiguchi, M. Nishimura
IEICE TRANSACTIONS on Information and Systems 86(3), 514--521, The Institute of Electronics, Information and Communication Engineers, 2003

Sound source localization using a pinna-based profile fitting method
O. Ichikawa, T. Takiguchi, M. Nishimura
International Workshop on Acoustic Echo and Noise Control (IWAENC2003), pp. 263--266


2002

Computation of the flow field around arbitrary three-dimensional body geometry using Cartesian grid
Osamu Ichikawa, Kozo Fujii
Transactions of the Japan Society of Mechanical Engineers, B 68(669), 1329-1336, 2002
(in Japanese)

Noise reduction by profile fitting method
O. Ichikawa, T. Takiguchi, M. Nishimura
IEIC Technical Report (Institute of Electronics, Information and Communication Engineers) 102(107), 19--23, 2002