研究者詳細 - 西村　竜一

Misc - 西村　竜一

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日本語母音データベースを用いた声道長推定法の校正について

小林真優子, 坂口諒, 西村竜一, 入野俊夫, 河原英紀

日本音響学会2014年度春季研究発表会 ( 日本音響学会 ) 305-306 2014年03月

日本語スピーキングテストS-CATの音声入力インタフェース設計

田藤千弘, 西村竜一, 河原英紀, 入野俊夫, 今井新悟

日本音響学会2014年度春季研究発表会 ( 日本音響学会 ) 141-142 2014年03月

スマートフォンを用いた環境音の収録と認識方法の検討

津田貴彦, 松山みのり, 西村竜一, 河原英紀, 山田順之介, 入野俊夫

日本音響学会2014年度春季研究発表会 ( 日本音響学会 ) 847-848 2014年03月

Realtime conversion of growl-type voice qualities based on modulation and approximate time-varying filtering driven by a non-linear oscillator: Formulation

Hideki Kawahara, Shohei Mizobuchi, Masanori Morise, Ken-ichiSakakibara, Ryuichi Nisimura, Toshio Irino

研究報告音楽情報科学（MUS） ( 一般社団法人情報処理学会 ) 2014 ( 14 ) 1 - 6 2014年02月

A formulation of voice conversion to add growl-like voice qualities to singing voices is proposed based on our findings of features in such singing performances. The proposed method does not consist of any analysis and synthesis stage(s). A preliminary implementation using Matlab demonstrated that its throughput is faster than realtime. The proposed formulation provides not only post processing capabilities of rendering styles of existing performances to recorded materials but also realtime capabilities of adding growl-like voice qualities in live performances.A formulation of voice conversion to add growl-like voice qualities to singing voices is proposed based on our findings of features in such singing performances. The proposed method does not consist of any analysis and synthesis stage(s). A preliminary implementation using Matlab demonstrated that its throughput is faster than realtime. The proposed formulation provides not only post processing capabilities of rendering styles of existing performances to recorded materials but also realtime capabilities of adding growl-like voice qualities in live performances.

非線形振動子による変調と近似時変フィルタに基づくグロウル系統の歌唱への実時間変換の定式化について

河原英紀, 溝渕翔平, 森勢将雅, 榊原健一, 西村竜一, 入野俊夫

第102回情報処理学会音楽情報科学研究会 ( 情報処理学会音楽情報科学研究会 ) 2014-MUS-102-14 2014年02月

圧縮特性推定における非対称レベルノッチマスキング法と時間マスキング曲線法の対比

深渡瀬智史, 入野俊夫, 西村竜一, 河原英紀

日本音響学会聴覚研究会 ( 日本音響学会聴覚研究会 ) 44 ( 1 ) vol. 44, no. 1, H-2014-2, pp. 7-12 - 12 2014年02月

模擬難聴実現のための逆圧縮特性処理とユーザインタフェース

永江美沙貴, 入野俊夫, 西村竜一, 河原英紀

日本音響学会聴覚研究会 ( 日本音響学会聴覚研究会 ) 44 ( 1 ) vol. 44, no. 1, H-2014-3, pp. 13-18 - 18 2014年02月

文章音声の好感度評価と属性別モーフィングを用いた要因の検討について

吉元照貴, 西村竜一, 入野俊夫, 河原英紀

電子情報通信学会・日本音響学会音声研究会 ( 電子情報通信学会・日本音響学会音声研究会 ) 信学技報, vol. 113, no. 404, SP2013-104, pp. 49-54, 2014年1月. 2014年01月

Developing a method to build Japanese speech recognition system based on 3-gram language model expansion with Google database

Toshiaki Shimada, Ryuichi Nisimura, Masayasu Tanaka, Hideki Kawahara, Toshio Irino

2013 IEEE Conference Anthology, ANTHOLOGY 2013 ( IEEE Computer Society ) pp.271-276 2014年 [査読有り]

We have developed a method to build a Japanese automatic speech recognition (ASR) system based on 3-gram language model expansion with the Google database. Our aim is to enhance the recognition accuracy of ASR systems based on the 3-gram language model, even in cases where the language model is trained using short text segments. We investigate a practical approach to expanding language models by using 3-gram information from external web documents. In addition, we filter 3-gram entries on the basis of term frequency-inverse document frequency (TF-IDF) scores and the output of the Yahoo! web API to prevent the unnecessary addition of redundant or irrelevant 3-gram entries. In the experiments, we achieved an improvement of 0.71% in the word error rate and proved that the recognition accuracy can be improved by combining the proposed method and the traditional back-off smoothing technique without any costs being incurred in collecting additional text for training the model. © 2013 IEEE.

DOI

Development of a mobile application for crowdsourcing the data collection of environmental sounds

Minori Matsuyama, Ryuichi Nisimura, Hideki Kawahara, Junnosuke Yamada, Toshio Irino

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) ( Springer Verlag ) 8521 ( 1 ) 514 - 524 2014年 [査読有り]

Our study introduces a mobile navigation system enabling a sound input interface. To realize high-performance environmental sound recognition system using Android devices, we organized a database of environmental sounds collected in our daily lives. Crowdsourcing is a useful approach for organizing a database based on collaborative works of people. We recruited trial users to test our system via a web-based crowdsourcing service provider in Japan. However, we found that improvement of the system is important for maintaining the motivation of users in order to continue the collection of sounds. We believe that the improved user interface (UI) design introduced to facilitate the annotation task. This paper describes an overview of our system, focusing on a method for utilizing the crowdsourcing approach using Android devices, and its UI design. We developed a touch panel UI for the annotation task by selecting an appropriate class of a sound source. © 2014 Springer International Publishing.

DOI

Proposal for an Interactive 3D Sound Playback Interface Controlled by User behavior

Ryuichi Nisimura, Kazuki Hashimoto, Hideki Kawahara, Toshio Irino

Communications in Computer and Information Science ( Springer Verlag ) 434 446 - 450 2014年 [査読有り]

Our study introduces an interactive 3D sound playback interface system that is controlled by the user's behavior. It consists of an Android terminal, stereo headphone, and Nintendo Wii Balance Board. Traditional binaural audio systems can only deal with simple fixed playback conditions. On the other hand, our system assumes that the user is continuously moving. When a user who is riding on the Wii Balance Board moves his/her body, binaural sounds during playback are generated according to changes in his/her center of gravity. To implement the system, we have prepared a set of twenty-four acoustic signals for embedding into the system. If the user's center of gravity corresponds with one of the twenty-four regions, an acoustic signal recorded in advance corresponding to that region is reproduced for the user. We experimentally evaluate how accurately a user can judge the position of a sound source. Experimental results prove the proposed system yielded significantly higher locational accuracy than the original binaural system. © Springer International Publishing Switzerland 2014.

DOI

近似時変フィルターを用いたグロウル系統の歌唱音声合成の検討

溝渕翔平, 西垣友理, 西村竜一, 入野俊夫, 河原英紀