研究および論文、学会発表

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  1. 国際学会発表 －MCHA95
  2. 論文集への掲載と出版
  3. Acustica acta acustica 論文
  4. 国際学会発表 －16th ICA/135th ASA MEETING（シアトル）
  5. 国際学会発表 － 137th ASA/2nd EAA MEETING（ベルリン）
  6. 論文集への掲載と出版 －ＪＳＶ論文
  7. 神戸国際ワークショップ（1999年11月開催）
  8. 神戸大学大学院自然科学研究科博士課程 学位論文（January 2000）
  9. JSV (Journal of Sound and Vibration, Academic Press) 掲載発表論文
  10. 17th ICA （ローマ） －2001年09月開催

国際学会発表 －MCHA95

MCHA95（Music and Concert Hall Acoustics: 音楽とコンサートホール音響学のための国際会議）にて、A Sound Simulation System for Seat Selection の発表を行う。

アブストラクト
A Sound Field Simulation applicable to a seat selection system and a concert ticket issuing system
As a service to those who make use of the concert hall, Miyama Conceru has come up with a system for providing tickets for seats that match the audio preferences of the patron (a seat selection ticket reservation and issuing system).
This system is implemented by acoustical devices installed in a sound field simulation room and a computer system. In addition to these systems, a system can be built that comprehensively handles the basic operations needed for managing a hall , including event control, customer control, booking and renting out of facilities, and ticket reservation and sales consignment.
■ 論文の内容については、博士論文 Chapter 4 をご参照ください。

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論文集への掲載と出版

MCHA95 Music & Concert Hall Acoustic Conference Proceedings from MCHA 1995. Ando, Y. & Noson, D. Eds., Academic Press, London, 1997.

1995年5月霧島国際音楽ホール（設計: 槙文彦、音響設計: 安藤四一）にて、MCHA95(Music and Concert Hall Acoustics: 音楽とコンサートホール音響学のための国際会議)が４日間にわたって開催された。本書では、その会議で発表された全論文の中から査読・選考したものをまとめた。その内容は、第１章の建築家・槙文彦氏から最終章の音楽家そして指揮者でもあるJurgen Meyer氏まで、音響学・建築学・音楽学など多岐にわたり、科学と芸術を融合するコンサートホールの設計への新たな視点をもたらすものである。

発表論文
 A Sound Simulation System for Seat Selection. Sakurai, M., Korenaga, Y. and Ando, Y., 51-59.

Acustica acta acustica 論文

Acoustic Design of a Concert Hall Applying the Theory of Subjective Preference and the Acoustic Measurement after Construction.
Ando, Y., Sato, S., Nakajima, T. and Sakurai, M.
Acustica acta acustica, 83, 635-643, 1997.

Subjective Preferenceの理論で設計されたコンサートホールの、建設後の実際の音響測定に関する論文です。これは、霧島国際音楽ホールの設計段階での音場シミュレーションシステムが計算したプリファレンスを決定するパラメーターを、実際の建設後の実測数値と比較検討するものですが、音場シミュレーションシステムの性能が、論文で実証されています。
■ 論文の内容については、博士論文のChapter 2 をご参照ください。

国際学会発表 －16th ICA/135th ASA MEETING（シアトル）

16th ICA/135th ASA MEETING (1998.6.20-26)
音場測定システムに関する初めての論文を、1998年6月20日－26日にアメリカ合衆国のシアトルで開催された 16th INTERNATIONAL CONGRESS ON　ACOUSTICS AND 135th MEETING ACOUSTICAL SOCIETY OF AMERICA で発表し注目をあびました。

アブストラクト
"New diagnostic system measuring orthogonal factors and calculating subjective attributes of sound fields in a real room"
Masatugu Sakurai (Yoshimasa Erectronic Inc., Yoyogi, Sibuya, Tokyo 151 Japan, Graduate School of Science and Technology, Kobe Univ., Nada, Kobe 657 Japan) and Shinichi Aizawa (Yoshimasa Erectronic Inc., Yoyogi, Sibuya, Tokyo 151 Japan) and Yoichi Ando (Graduate School of Science and Technology, Kobe Univ., Nada, Kobe 657 Japan)
Based on the model of auditory-brain system which consists of the autocorrelation mechanism, the interaural crosscorrelation mechanism between the both auditory pathways, and the specialization of human cerebral hemispheres, a new diagnostic system was developed. The system works on PC for Windows, thus it is no need for special additional devices. After obtaining the impulse response, four orthogonal factors including the SPL, the initial time delay gap between the direct sound and the first reflection, the subsequent reverberation time and IACC are analyzed for the calculation of the scale values of global and individual subjective preference. In addition to the four factors, two more factors, tIACC and WIACC, in the interaural crosscorrelation function are figured out for evaluating the image shift of sound source and the apparent source width (ASW), respectively. Also, the effective duration, te, and fine structures of autocorrelation function of sound signals including the value of first maximum, f1 and its delay time t1 are analyzed. Keeping the subjectively optimal condition, this system may be utilized for automatic control of sound fields by electroacoustic systems. The new system will be demonstrated at the presentation of this paper.
■ PROCEEDINGS掲載論文

■ ビデオ ※ビデオの再生にはRealPlayer Basic（無料配布）が必要です。
発表
□ Calculation and Measurement of Acoustic Factors for the Kirishima International Concert Hall（竹中工務店技術研究所　、中島立視博士）(16分19秒）
□ オペラハウスアコーステックス（イタリア、Pompoli教授）（6分間）
□ Subjective Attributes for Sound Fields from a Model of Auditory-brain System （神戸大学、安藤四一教授）（18分間）
□ Subjective Attributes for Sound Fields from a Model of Auditory-brain System（神戸大学、安藤四一教授）（18分間/手持ち版）
□ Calculation of Speech Intelligibility using Four Orthogonal Factors Involved in Autocorrelation Functions.（神戸大学、安藤四一教授）（22分35秒）
□ Calculation of Speech Intelligibility using Four Orthogonal Factors Involved in Autocorrelation Functions.（神戸大学、安藤四一教授）（22分35秒/手持ち版）
模型実験（ベルフォーレ津山）
□ 座席の音響パラメーターの測定（1/10模型）ビデオ（3分35秒）
□ ベルフォーレ津山の建築音響実測ビデオ（8分46秒）

■ アルバム

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模型実験
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16th ICA and 135th ASA Meeting
ASA (ACOUSTICAL SOCIETY OF AMERICA)

国際学会発表 － 137th ASA/2nd EAA MEETING（ベルリン）

137th ASA/2nd EAA MEETING (1999.3.14-19)
1999年3月14－19日にドイツのベルリンで開催された137TH MEETING OF THE ACOUSTICAL SOCIETY　OF AMERICA AND THE 2ND CONVENTION OF THE EUROPEAN ACOUSTICS ASSOCIATIONで、インターネットを活用する音場測定システムと、その応用の可能性としての地域環境騒音の計測・心理評価システムの発表を行いました。

（発表論文）An Internet-Oriented System for Acoustic Measurements of Sound Fields. M. Sakurai, S. Aizawa, and Y. Ando

アブストラクト
"An Internet-Oriented System for Acoustic Measurements of Sound Fields"
Masatugu Sakurai(Yoshimasa Erectronic Inc., Yoyogi, Sibuya, Tokyo 151-0053 Japan, Graduate School of Science and Technology, Kobe Univ., Nada, Kobe 657-8501 Japan) and Shinichi Aizawa(Yoshimasa Erectronic Inc., Yoyogi, Sibuya, Tokyo 151-0053 Japan) and Yoichi Ando(Graduate School of Science and Technology, Kobe Univ., Nada, Kobe 657-8501 Japan)
Based on the model of auditory-brain system, a new diagnostic system was developed. The system including the AD and DA converters works on PC for Windows, thus it is no need for special additional devices. Further, the system is available on internet, where a user can obtain further information about the system, and utilize it easily in practice by the download of a demonstration program. After obtaining the binaural impulse responses, four orthogonal factors including the SPL, the initial time delay gap between the direct sound and the first reflection, the subsequent reverberation time and the IACC are analyzed. Then, these factors may be used for the calculation of the scale values of both global and individual subjective preference. In addition, two more factors, tIACC and WIACC in the interaural crosscorrelation function are figured out for evaluating the image shift or balance of sound fields and the apparent source width (ASW), respectively. Also, the effective duration of ACF, te, and fine structures of autocorrelation function of sound signals including the value of first maximum, f1 and its delay time t1 are analyzed. This system may be utilized for automatic control of sound fields by electroacoustic systems also.

■ PROCEEDINGS掲載論文

■ ビデオ ※ビデオの再生にはRealPlayer Basic（無料配布）が必要です。
□ An Internet-Oriented System for Acoustic Measurements of Sound Fields（吉正電子、櫻井正次）（19分40秒）

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137the ASA and 2nd EAA Meeting
ASA (ACOUSTICAL SOCIETY OF AMERICA)

論文集への掲載と出版 －ＪＳＶ論文

Publication in the special issue of the Journal of Sound and Vibration.

A DIAGNOSTIC SYSTEM MEASURING ORTHOGONAL FACTORS OF SOUND FIELDS IN A SCALE MODEL OF AUDITORIUM 
M. SAKURAI, S. AIZAWA, Y. SUZUMURA, Y. ANDO 
Journal of Sound and Vibration, Vol. 232, No. 1, Apr 2000, pp. 231-237 (doi: 10.1006/jsvi.1999.2695)

■ 論文
■ IDEAL論文ライブラリ

神戸国際ワークショップ（1999年11月開催）

A Computational Software System of the Noise Identification.
Masatsugu Sakurai and Yoichi Ando (Graduate School of Science and Technology, Kobe University, Rokkodai, Nada, Kobe 657-8501 Japan)

アブストラクト
Based on the model of auditory-brain system, this system was developed for environmental noise measurements and identification of noise with directional and spatial information. The system including the AD and DA converters works on PC for Windows, thus it is no need for special additional devices. The system is available on Internet, where a user can obtain further information about the system, and utilize it easily in practice by the download of a demonstration program. The acoustic signals are picked up at two microphones located at the ear-entrances of a real head or dummy head for each measuring point. Collected data are analyzed by both of the autocorrelation funcntion and the interaural crosscorreration function due to the model. The orthogonal factors extracted from both functions are utilized for identification of noise sources, and the subjective evaluations.

神戸大学大学院自然科学研究科博士課程 学位論文（January 2000）

Computational Systems for Sound Fields, as Tools in Design and Diagnosis
Masatsugu Sakurai （Graduate School of Science and Technology, Kobe University）

アブストラクト
The concept of these systems are based on the model of human auditory-brain system including the autocorrelation mechanisms, interaural cross-correlation mechanism, and the specialization of the human cerebral hemispheres. Thesis consists of following four parts:
･ Computer simulation system for calculating the four orthogonal factors (LL, Dt1, Tsub and IACC) at each seat using architectural drawings were developed. The accuracy of this system were examined by comparing the calculated factors with the measured ones at Kirishima International Concert Hall.
･ The diagnostic system to measure the four orthogonal factors and additional factors (tIACC, WIACC and A-value) was developed. This system can be used for the measurement in the scale model. The effect of the reflectors' array above stage which can not calculate at the design stage was evaluated at the scale model measurement of Tsuyama music cultural hall.
･ As an application of the subjective preference theory, seat selection system to maximize the preference of each individual was developed. This system, which is installed in Kirishima International concert hall, can find the seat where the preference is maximized by the paired comparison test with respect to the four orthogonal factors.
･ Noise measurement system to measure and identify the environment noise using the factors extracted from the autocorrelation function (F(0), te, t1 and f1) and the factors extracted from the interaural crosscorrelation function (IACC, tIACC and WIACC) was developed. As an example, noises from different car engines were characterized by these factors measured by this system.

■ 博士論文
■ 神戸大学大学院自然科学研究科安藤研究室サイト

JSV (Journal of Sound and Vibration, Academic Press) 掲載発表論文

A COMPUTATIONAL SOFTWARE FOR NOISE MEASUREMENT AND TOWARD ITS IDENTIFICATION 
M. SAKURAI, H. SAKAI, Y. ANDO 
Journal of Sound and Vibration, Vol. 241, No. 1, Mar 2001, pp. 19-27 (doi: 10.1006/jsvi.2000.3273)

■ 論文
■ IDEAL論文ライブラリ

17th ICA （ローマ） －2001年09月開催

A computational software for identification of noise - an application for car engines
Masatsugu Sakurai

アブストラクト
Identification results of noise from car engine using a computational system are described here. The concept of the system is based on the model of human auditory-brain system [Y. Ando. Architectural Acoustics -Blending Sound Sources, Sound Fields, and Listeners-, AIP Press/Springer-Verlag, New York 1998], which includes the autocorrelation function (ACF) and interaural crosscorrelation function (IACF) mechanisms and the specialization of the human cerebral hemispheres. The system consists of the software of a laptop computer, and a receiver with dual channel microphones. The software is developed to measure the physical factors in noise fields and the characterization of the regional environment noise. There are four orthogonal factors extracted from the ACF of the noise source, F(0), te, t1 and f1. Also there are three spatial factors, IACC, tIACC, and WIACC. These factors may be utilized for the identification of the noise source as a timbre difference. Results show that the identification of the noise sources of different car-engines made here is satisfactory.

■ PROCEEDINGS掲載論文
■ 発表内容
■ アルバム

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