2025.8.24 My research about variable-step-size algorithm for acoustic echo and noise canceller is accepted to APSIPA ASC 2025. Other three studies are also accepted to APSIPA ASC 2025.
2025.8.22 無響室 (ソノーラテクノロジー製) の施工が完了しました.
Anechoic room (Sonora Technology Co., Ltd.) is installed in my lab.
2025.4.1 大阪産業大学情報デザイン学部に准教授として着任しました．
I belong to Faculty of Information Desing Technology, Osaka Sangyo University as an assistant professor.
2024.05.10 日本音響学会誌80巻5号にて，能動騒音制御に関する小特集記事「アクティブ騒音制御に残された課題と解決に向けたアプローチ (小特集―アクティブ制御の今―) 」が掲載されました．
My invited paper about active noise control has been published in the Journal of Acoustical Society of Japan, vol. 80, no. 5 (in Japanese).
2024.04.01 立命館大学情報理工学部が大阪いばらきキャンパスに移転しました．
移転に伴い，岩居の勤務先も大阪いばらきキャンパスに変更となりました．
College of Information Science and Engineering, Ritsumeikan University relocated at Osaka Ibaraki Campus in Osaka, Japan (my new workplace).
*I am sorry not to update "what's new?" in 2023.
If you want to see the publication in 2023, please see "Publication."
2023.04.01 立命館大学情報理工学部 講師に昇格しました．
＊大連理工大学・立命館大学国際情報ソフトウェア学部の講義も担当．
I become a Lecturer at College of Information Science and Engineering, Ritsumeikan University.
Also, I make a lectures at DUT-RU International School of Information Science and Engineering.
2023.01.25 The article entitled "Head-Mounted Multi-Channel Feedforward Active Noise Control System for Reducing Noise Arriving From Various Directions" is published in IEEE Access.
DOI: https://doi.org/10.1109/ACCESS.2023.3237812
2022. 9.22 The article entitled "Speech Enhancement for Laser Doppler Vibrometer Dealing with Unknown Irradiated Objects" has been accepted to IEICE Transactions on Fundamentals.
*This article is written by C. Chengkai, doctor course student in ASPL in Ritsumeikan University.
I am a second author of the article.
2022. 9. 10 My researches have been accepted to APSIPA ASC 2022.
(1) Kenta Iwai and Takanobu Nishiura, "Acoustic Echo and Noise Canceller Using Shared-Error Normalized Least Mean Square Algorithm"
(2) Binh Thien Nguyen, Yukoh Wakabayashi, Yuting Geng, Kenta Iwai and Takanobu Nishiura, "Von Mises Mixture Model-Based DNN for Sign Indetermination Problem in Phase Reconstruction"
(3) Yanqiao Yan, Binh Thien Nguyen, Yuting Geng, Kenta Iwai and Takanobu Nishiura, "Phase-Aware Audio Super-Resolution for Music Signals Using Wasserstein Generative Adversarial Network"
2022. 7. 21 (公財) KDDI財団HPにて, 本財団助成による研究成果のサマリーが公開されました.
URL: https://info.kddi-foundation.or.jp/6632/
2022. 4. 4 立命館大学研究活動報にて, 研究内容が紹介されました.
My research has been introduced on Ritsumeikan University Research Report.
URL: http://www.ritsumei.ac.jp/research/radiant/sound/story7.html/
2022. 2. 14 "3-D Sound Image Reproduction Method Based on Spherical Harmonic Expansion for 22.2 Multichannel Audio" has been published in Applied Sciences.
DOI: https://doi.org/10.3390/app12041994
2021. 9. 1 Two research topics about active noise control and nonlinear digital filter are accepted to APSIPA ASC 2021.
2021. 4. 1 立命館大学 情報理工学部 助教に着任しました.
I become an assistant professor of College of Information Science and Engineering, Ritsumeikan University, Japan.
日本学術振興会, 科学研究費助成事業 (若手研究) に採択されました.
(研究テーマ：⾳響エコー低減および雑⾳抑圧のためのマルチタスク適応フィルタの研究)
My research theme (Multi-task adaptive digital filter for reduction of acoustic echo and environmental noise)
is adopted to the JSPS-KAKENHI (Early-Career Scientists).
2020.12. 8 Two ANC presentations have been presented on APSIPA ASC 2020.
2020.10. 5 Two manuscripts of active noise control systems are accepted to APSIPA ASC 2020.
2020. 3. 2 2020年3月信号処理研究会にて, "[ポスター講演]非線形IIRフィルタの非線形音響エコーキャンセラへの応用"について発表.
Poster presentation "A Study on Application of Nonlinear IIR Filter to Nonlinear Acoustic Echo Canceller" at Conference of Technical Committee on Signal processing (SIP), Japan
*This conference have been cancelled due to COVID-19.
2019.11.20 APSIPA ASC 2019 (蘭州, 中国)にて, "Audio Integrated Active Noise Control System with Auto Gain Controller"について発表
Oral presentation "Audio Integrated Active Noise Control System with Auto Gain Controller" at APSIPA ASC 2019, Lanzhou, China.
2019.11.13 第34回信号処理シンポジウムにて, 「光レーザマイクロホンを用いたフィードフォワードANCシステムの検討」について発表
Oral presentation "A study on feedforward active noise control system with optical laser microphone" at 34th 33rd Signal Processing Symposium, Japan.
2019. 8. 2 "Audio Integrated Active Noise Control System with Auto Gain Controller" is accepted to APSIPA ASC 2019.
2019. 4.10 "Multichannel feedforward active noise control system combined with noise source separation by microphone arrays" が
国際論文誌Journal of Sound and Vibration (Elsevier) に採録されました.
"Multichannel feedforward active noise control system combined with noise source separation by microphone arrays" have been accepted
on Journal of Sound and Vibration (Elsevier).
2019. 4. 1 公益財団法人KDDI財団, 調査研究助成に内定しました (研究テーマ：非線形再帰フィルタの拡声通話機器への応用, Aprl. 2019 - Mar. 2022).
Got Research Grant Program of KDDI Foundation (Research theme：Application of nonlinear recursive digital filter for hands-free telecommunication system , Aprl. 2019 - Mar. 2022).
2018.11.19 "Multichannel Feedforward Active Noise Control System with Optimal Reference Microphone Selector Based on Time Difference of Arrival"
が国際論文誌Applied Science (MDPI) に採録されました.
"Multichannel Feedforward Active Noise Control System with Optimal Reference Microphone Selector Based on Time Difference of Arrival"
have been accepted and published on Applied Science (MDPI).
2018.11. 6 第33回信号処理シンポジウムにて, 「動電型スピーカの非線形特性の離散時間表現」について発表
Oral presentation "Discrete Time Representation for Nonlinear Characteristics of Electrodynamic Loudspeaker" at 33rd Signal Processing Symposium, Japan.
2018. 9. 12 日本音響学会 2018年秋季研究発表会にて, 「非線形2次IIRフィルタの周波数領域表現の検討」について発表
Poster presentation "Study on Frequency Domain Representation of Nonlinear IIR Filter" at Acoustical Society of Japan Autumn Meeting 2018.
2018. 3. 19 信号処理研究会にて, 「[ポスター講演] 非線形2次IIRフィルタの周波数特性の定式化」について発表
Poster presentation, "Formulation of frequency characteristic of second-order nonlinear IIR filter" at Conference of Technical Committee on Signal processing (SIP), Japan
2018. 1. 16 立命館大学情報理工学部の特任助教に着任が決まりました.
In April, he will work at Faculty of Information Science and Technology, Ritsumeikan University, Japan.
2018. 1. 8 "Modified Second-Order Nonlinear Infinite Impulse Response (IIR) Filter for Equalizing Frequency Response and Compensating Nonlinear Distortions of Electrodynamic Loudspeaker"が国際論文誌 Applied Acoustics (Elsevier) が公開されました.
The article "Modified Second-Order Nonlinear Infinite Impulse Response (IIR) Filter for Equalizing Frequency Response and Compensating Nonlinear Distortions of Electrodynamic Loudspeaker" is published in Applied Acoustics (Elsevier).
2017.11.14 "Modified Second-Order Nonlinear Infinite Impulse Response (IIR) Filter for Equalizing Frequency Response and Compensating Nonlinear Distortions of Electrodynamic Loudspeaker"が国際論文誌 Applied Acoustics (Elsevier) に採録確定
The article "Modified Second-Order Nonlinear Infinite Impulse Response (IIR) Filter for Equalizing Frequency Response and Compensating Nonlinear Distortions of Electrodynamic Loudspeaker" is accepted in Applied Acoustics (Elsevier).
2017.11.10 第32回信号処理シンポジウムにて, 「非凸二次制約付き最適化によるMirrorフィルタのパラメータ推定の推定精度向上に関する検討」について発表
Oral presentation "Study on parameter estimation method for mirror filter based on quadratically constrained quadratic optimization for improvement of the estimation accuracy" at 32nd Signal Processing Symposium, Japan.
2017. 9. 26 日本音響学会 2017年秋季研究発表会にて, 「機械抵抗の非線形性を考慮した非線形2次IIRフィルタによるマイクロスピーカの非線形歪み補正」について発表
Poster presentation "Second-order Nonlinear IIR Filter with Nonlinearity of Mechanical Damping for Reducing Nonlinear Distortions of Microspeakers" at Acoustical Society of Japan Autumn Meeting 2017.
2017. 9. 1 EUSIPCO 2017 (ギリシャ, コス島) にて, "Modification of Second-Order Nonlinear IIR Filter for Compensating Linear and Nonlinear Distortions of Electrodynamic Loudspeaker" について発表
Oral presentation "Modification of Second-Order Nonlinear IIR Filter for Compensating Linear and Nonlinear Distortions of Electrodynamic Loudspeaker" at EUSIPCO 2017, Kos island, Greece.
2017. 5.26 "Modification of Second-Order Nonlinear IIR Filter for Compensating Linear and Nonlinear Distortions of Electrodynamic Loudspeaker" が欧州の信号処理系の国際会議EUSIPCO 2017でアクセプトされました
"Modification of Second-Order Nonlinear IIR Filter for Compensating Linear and Nonlinear Distortions of Electrodynamic Loudspeaker" is accepted at EUSIPCO 2017.
2017. 3. 2 2017年3月信号処理研究会にて, 「非凸二次制約付き最適化を利用したMirrorフィルタのパラメータ推定 ～ 実測振動板変位を用いた推定 ～」について発表
Poster presentation "Parameter estimation method for mirror filter based on quadratically constrained quadratic optimization ~A study on a estimation using measured displacement of the diaphragm ~," at Conference of Technical Committee on Signal processing (SIP), Japan
2016. 11. 29 5th Joint Meeting of the Acoustical Society of America and the Acoustical Society of Japanにて, ''Modified 2nd-order nonlinear infinite impulse response (IIR) filter for compensating sharpness and nonlinear distortions of electrodynamic loudspeakers''について発表
Poster presentation "Modified 2nd-order nonlinear infinite impulse response (IIR) filter for compensating sharpness and nonlinear distortions of electrodynamic loudspeakers" at 5th Joint Meeting of the Acoustical Society of America and the Acoustical Society of Japan, Honolulu, Hawaii, USA
2016. 11. 8 第31回信号処理シンポジウムにて、「非凸二次制約付き最適化を利用したMirrorフィルタのパラメータ推定法」 について発表
Oral presentation "Parameter estimation method for mirror filter based on quadratically constrained quadratic optimization" at 31st Signal Processing Symposium, Japan
2016. 9. 14 日本音響学会 2016年秋季研究発表会にて、「動電型スピーカの線形特性の補正を可能とする非線形IIR フィルタ構造」について発表
Poster presentation "Modified 2nd-order Nonlinear IIR Filter for Compensating Sharpness and Nonlinear Distortions of Electrodynamic Loudspeakers" at 2016 Autumn meeting of Acoustical Society of Japan
2016. 9. 8 台湾のChung Yuan Christian Universityにて、招待講演 "Nonlinear Filtering for .Reducing Nonlinear Distortions of Electrodynamic Loudspeaker" について発表
＊本講演は、3rd Joint Symposium on Electrical Engineering and Computer Science in Chung Yuan Christian University and Kansai University の一イベントとして行われた
Invited lecture "Nonlinear Filtering for .Reducing Nonlinear Distortions of Electrodynamic Loudspeaker" at 3rd Joint Symposium on Electrical Engineering and Computer Science in
Chung Yuan Christian University and Kansai University, Taiwan