研究者詳細 - 水町　光徳

論文 - 水町　光徳

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研究発表会の現在地2025 招待有り

水町光徳

日本音響学会誌 ( 一般社団法人日本音響学会 ) 81 ( 1 ) 100 - 104 2024年12月

研究委員会の現在地2025 招待有り

大川茂樹, 水町光徳, 石井要次, 大隅歩

日本音響学会誌 ( 一般社団法人日本音響学会 ) 81 ( 1 ) 90 - 99 2024年12月

Efficient Frequency Bandwidth Limitation for Wireless-Based Ultrasonic Data Collection Systems 査読有り

Shigyo Rio, Nobayashi Daiki, Tsukamoto Kazuya, Mizumachi Mitsunori, Ikenaga Takeshi

信号処理 ( 信号処理学会 ) 28 ( 4 ) 129 - 132 2024年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

<p> IoT-based acoustic data collection systems have been proposed for detecting anomalies in mechanical equipment. However, traditional systems using audible sound do not work well due to interference from various sound sources. To solve this problem, we have previously proposed an ultrasonic data collection system, but the clear and high-quality sound required for anomaly detection results in an increase in data volume. This paper proposes a method for extracting only the necessary frequency band based on the periodicity of the target signal, aiming to reduce the amount of data. Our experiments demonstrate that the proposed method efficiently determines the appropriate frequency band in which the characteristics of the target equipment appear, thereby enabling the amount of data to be reduced by more than 45%.</p>

DOI： 10.2299/jsp.28.129

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/jsp/28/4/28_129/_pdf

Subband Optimization of Broadband Nonlinear Beamformer with Long Short-Term Memory 査読有り国際誌

M. Mizumachi, K. Nashiro

Proc. 30th International Congress on Sound and Vibration Paper ID: 550 2024年07月

Frequency dependency of inter-channel cross-correlation for stereo sources 査読有り国際誌

M. Mizumachi, T. Horiuchi

Proc. 156th AES Convention Express Paper 27 2024年06月

発声時の音環境操作ツールにおける実時間処理とインタフェースの実装について

河原英紀, 矢田部浩平, 松井淑恵, 程島奈緒, 水町光徳, 榊原健一

聴覚研究会資料 54 ( 3 ) 247 - 252 2024年05月

An Efficient Method of Frequency Bandwidth Limitation for Wireless-based Ultrasonic Data Collection System 査読有り国際誌

R. Shigyo, D. Nobayashi, K. Tsukamoto, M. Mizumachi, T. Ikenaga

Proc. 2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP’24) 28PM2-2-2 2024年03月

Relationship between the Temporal Variation of Fundamental Frequency and Subjective Hoarseness 査読有り国際誌

S. Tomimatsu, M. Mizumachi

Proc. 2024 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP’24) 28AM2-1-5 2024年03月

ヘッドフォン装着時に外耳道入口において収録される信号の内容について

河原英紀, 矢田部浩平, 松井淑恵, 程島奈緒, 榊原健一, 水町光徳

聴覚研究会資料 54 ( 2 ) 93 - 98 2024年02月

Contributions of temporal envelope and temporal fine structure to segregation of Lombard speech from background noise 査読有り

Tamura S., Mizumachi M.

Acoustical Science and Technology ( 一般社団法人日本音響学会 ) 45 ( 1 ) 33 - 44 2024年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

Lombard speech is known to make it easier for listeners to perceive speech signals in the presence of background noise. The aim of this study was to investigate how temporal characteristics such as the temporal envelope and temporal fine structure (TFS) in Lombard speech contribute to improve the segregation of Lombard speech from background noises. In the speech production task, we confirmed that Lombard speech had increased low-frequency amplitude modulations in the temporal envelope and increased frequency modulations in TFS compared to plain speech in frequency ranges covering first and second formants. In a speech perception task, ease of speech segregation was compared between Lombard and plain speech. We also compared ease of segregation of tone-vocoded speech created from Lombard and plain speech to examine the effect of eliminating TFS. We found that Lombard speech with both high amplitude and frequency modulations had improved speech segregation in both original and tone-vocoded speech conditions, but the difference in ease of speech segregation between Lombard and plain speech tended to be larger in original speech than tone-vocoded speech conditions. The present findings suggest that an enhanced envelope is the main contributor to improved segregation of Lombard speech, while increased frequency modulation plays a complementary role.

DOI： 10.1250/ast.e23.24

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85181966313&origin=inward

Frequency dependency of inter-channel cross-correlation for stereo sources 査読有り国際誌

Mizumachi M., Horiuchi T.

AES Madrid 2024 156th Audio Engineering Society Convention 2024年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Spatial audio has become popular in recent audio applications. Traditional 2-ch stereo sources also provide rich spatial representation. The authors have previously proposed amplitude-based and phase-based crosstalk generators for earphones and headphones reproduction. The parameters for those crosstalk generators were optimized to perceptually generate the suitable stereo stage width compared with the binaural rendering. Investigating the dominant frequency range, which perceptually determines the stereo stage width, is essential in spatial audio. This paper discusses the frequency dependency of inter-channel cross-correlation for 2-ch stereo sources. The frequency dependency of inter-channel cross-correlation, of course, depends on each music source. Those characteristics are investigated for typical classical and vocal music sources to discuss the perceptual aspects of spatial audio.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105003269203&origin=inward

Proposal of Protocols for Speech Materials Acquisition and Presentation Assisted By Tools Based on Structured Test Signals 査読有り国際誌

Kawahara H., Sakakibara K.I., Mizumachi M., Yatabe K.

2024 27th Conference on the Oriental Cocosda International Committee for the Co Ordination and Standardisation of Speech Databases and Assessment Techniques O Cocosda 2024 Proceedings 2024年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We propose protocols for acquiring speech materials, making them reusable for future investigations, and presenting them for subjective experiments. We also provide means to evaluate existing speech materials' compatibility with target applications. We built these protocols and tools based on structured test signals and analysis methods, including a new family of the Time-Stretched Pulse (TSP). Over a billion times more powerful computational (including software development) resources than a half-century ago enabled these protocols and tools to be accessible to under-resourced environments.

DOI： 10.1109/O-COCOSDA64382.2024.10800149

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85215666447&origin=inward

SUBBAND OPTIMIZATION OF BROADBAND NONLINEAR BEAMFORMER WITH LONG SHORT-TERM MEMORY 査読有り国際誌

Mizumachi M., Nashiro K.

Proceedings of the International Congress on Sound and Vibration 2024年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Nonlinear beamformers with neural networks have become popular with the remarkable development of machine learning. The concept of the neural network-based beamformer has been proposed in the early 1990s. The nonlinear beamformer trained with a single sinusoidal signal succeeds in sharpening its beampattern at the specific frequency. In other words, narrowband beamforming was achieved using traditional neural networks. Broadband beamforming is, however, indispensable in dealing with acoustic signals such as speech. Mizumachi and Arase have proposed a wideband nonlinear beamformer to sharpen the mainlobe in the speech band. It was challenging to achieve a sharp mainlobe in a lower frequency range below 500 Hz with an 8-ch small-scale microphone array. Then, the authors investigated subband optimization of the nonlinear beamformer in the lower frequencies at 500 Hz. In this study, the authors expand the frequency range of the subband optimization of the broadband nonlinear beamformer. It is confirmed that the nonlinear beamformer with long short-term memory could optimize with the different parameter settings, such as a suitable cell size and unit number, even in the low frequency of 250 Hz and high frequency of 8 kHz.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85205379908&origin=inward

様々な音響測定用信号を離散フーリエ変換に基づく測定法に用いる際の性能比較

河原英紀, 矢田部浩平, 水町光徳, 榊原健一, 北村達也

信学技報 EA2023-57 2023年12月

Acoustic measurement framework for audio systems based on structured periodic test signals 査読有り国際誌

Kawahara H., Yatabe K., Sakakibara K.I., Mizumachi M., Kitamura T.

GCCE 2023 - 2023 IEEE 12th Global Conference on Consumer Electronics 227 - 228 2023年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We introduce a framework for acoustic measurement that allows everyday sounds into acoustic measurement test signals and standard test signals such as swept-sine and MLS (Maximum Length Sequence). The framework extends our extended Time-Stretched-Pulse generation method and safeguarding method for any signals to make them appropriate for acoustic measurement. The extension uses the periodic nature of discrete Fourier transform combined with orthogonalization based on the Walsh-Hadamerd matrix. This framework enables simultaneous measurement of acoustic attributes such as linear time-invariant response, signal-dependent non-linear and time-invariant components, and random time-varying components. We also discuss and demonstrate practical scenarios in classes and laboratory lessons using tools developed based on the proposed framework.

DOI： 10.1109/GCCE59613.2023.10315633

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85179760475&origin=inward

Simultaneous Measurement of Multiple Acoustic Attributes Using Structured Periodic Test Signals Including Music and Other Sound Materials 査読有り国際誌

Kawahara H., Yatabe K., Sakakibara K.I., Mizumachi M., Kitamura T.

2023 Asia Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2023 173 - 180 2023年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We introduce a general framework for measuring acoustic properties such as liner time-invariant (LTI) response, signal-dependent time-invariant (SDTI) component, and random and time-varying (RTV) component simultaneously using structured periodic test signals. The framework also enables music pieces and other sound materials as test signals by “safeguarding” them by adding slight deterministic “noise.” Measurement using swept-sin, MLS (Maxim Length Sequence), and their variants are special cases of the proposed framework. We implemented interactive and real-time measuring tools based on this framework and made them open-source. Furthermore, we applied this framework to assess pitch extractors objectively.

DOI： 10.1109/APSIPAASC58517.2023.10317411

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85180006417&origin=inward

使える音声資料の作り方を再考する

河原英紀, 榊原健一, 水町光徳, 矢田部浩平, 北村達也, 森勢将雅

音声コミュニケーション研究会資料 ( 音声コミュニケーション研究委員会 ) 3 ( 4 ) n/a 2023年09月

記述言語：日本語掲載種別：研究論文（研究会，シンポジウム資料等）

<p>記録する音声資料をできるだけ価値があるものとする方法を検討している。そのような試みの一つとして、 2019 年に講習会を開催した。しかし、その講習会で紹介した内容の幾つかは、その後の技術の発展と検討により陳腐化しただけではなく、誤りであることが明らかになっている。ここでは、それらの発展と問題について説明し、新しい講習会をどのような内容・形式にすべきか議論したい。</p>

DOI： 10.60274/asjsc.sc-2023-25

CiNii Research

使える音声資料の作り方を再考する準備・録音・分析など

河原英紀, 榊原健一, 水町光徳, 矢田部浩平, 北村達也, 森勢将雅

音声コミュニケーション研究会資料 3 ( 4 ) SC-2023-25 2023年09月

遠隔異常検知システムのための機器稼働音の周期性に基づいた特徴量抽出の検討

執行律和, 野林大起, 塚本和也, 水町光徳, 池永全志

信学技報 IA2023-28 2023年09月

音場伝達関数の簡易な測定と臨界距離の推定のための試験信号について

河原英紀, 矢田部浩平, 榊原健一, 水町光徳, 北村達也

聴覚研究会資料 53 ( 6 ) 261 - 264 2023年08月

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