Profile (English)

SHIMIZU, Yasushi

  Acoustical Design & Research Consultant

E-mail: shimizu@shimiy.com 

              shimizu.yasushi@gmail.com

Site: https://sites.google.com/a/shimiy.com/acoustics/

Research Interests

Psychological acoustics

Active sound field control and sound field synthesis

Signal processing of room acoustics

Architectural acoustics measurement

Acoustical consultation of performing space

Education

  Graduate school

Tokyo Institute of Technology,

M.S., Civil Engineering, March 1977

  Under graduate school

Tokyo Institute of Technology,

B.S., Architecture, March, 1975

Academic Appointments

  Architectural Institue of Japan, Chair of Speech Privacy Committee for AIJES

                                                    Member of two committees

  Visiting Professor, Department of Built Environment, Tokyo Institute of Technology, Tokyo 2008 - 2016

Senior Research Associate Professor, Architectural Acoustics Program, Rensselaer Polytechnic Institute, USA, 2000-2003

  Yamaha Seminar on “Architectural Acoustics” (Japan), 1992-1997

  NHK Seminar on “Sound” (Japan), 1991

  Niigata Performing Arts Center Workshop on “Sound” (Japan), 1995

Professional Experience

  Group Leader,

Department of Research and Development, Yamaha Corporation of Japan, 2003-2010

MASS Project,  Collaboration of Yamaha/CCRMA, Stanford University, 2006

  Senior Research scientist, Sound Field Control Group

Acoustics Research Laboratories, YAMAHA Corporation of Japan, 1990-2000

  Research Scientist,

Architectural Acoustics Laboratory, YAMAHA Corporation of Japan, 1977-1990

  Member of Architecture design competition committee, Fukuroi Performing Arts Center, Japan 1997

  Licensed Architect (Japan)

Research field

                          For many years he has been actively interested in studying the psychological acoustics and sound field control technology as well as acoustical consultation of performing arts center.

His major research field has been sound field control technology with both and either of physical acoustic and electro-acoustic technique. He has conducted the research of subjective evaluation of concert hall acoustics, variable acoustic control technology with physical means, reverberation enhancement with electro-acoustic technology and sound field auralization of concert hall acoustics. From these researches he developed the Assisted Acoustics System (AAS) for the reverberation enhancement, Image Wall Sound (IWS) System for amphitheater acoustics and Sound Field Synthesizer (SFS) for virtual reality.  Besides he conducted the research of 1/10 acoustic scale model and sound field creation with computer simulation for acoustic consultation. During 1987 and 1989 he took charge of the research on the high-fidelity sound field reproduction system for TV with NHK science & technical research laboratories, Tokyo. During 1995 and 2000 he had leaded the cooperative research on active sound field control with Kohgakuin University, Tokyo.   He had taken charge of the acoustic consultation of the distinguished performing arts center in Japan, Taiwan and Singapore with the state of the arts technology and latest research results.

                         His recent interest is focusing the research on the acoustic control technology incorporating physical acoustics, electro-acoustics and information technology. The results will be applied to acoustic environment control of classroom and virtual sound filed creation of distance education, etc.

Representative Projects (Acoustical Consultation)

  Civic Hall in Shonandai Culture Center, Japan, 1991

  Fukuoka Symphony Hall, Japan, 1995

  Niigata City Performing Arts Center, Japan

  Osaka Dome, Japan, 1997

  Tokyo International Forum, Japan -- ICA, 1998/06

  Hakata-za – Kabuki Theater, Japan, 1999

  Singapore Indoor Stadium, Singapore, 1994

  Taiwan City Library Hall, Taiwan, 1995

Memberships in Professional Societies

  Acoustical Society of Japan

  Architectural Institute of Japan

  Acoustical Society of America

  Audio Engineering Society of America

Major Paper’s Presented

1. Active sound Field Control

   (JP) Improvement of low frequency characteristics in recording studio

                     Preprint of the conference of Acoustical Society of Japan, 1980/10

  (JP) Subjective impression due to the incident angle of the single echo   - Coloration and Image shift -

                     Architectural Acoustics Committee of Acoustical Society of Japan, 1983/05

  (JP) Acoustics of Houza-seki in Rissyo Kousei-kai   - Sound Field Control by electro-acoustic means -

                     Architectural Acoustics Committee of Acoustical Society of Japan,  AA85-33, 1985/10

  (JP) Assisted Acoustics,  Journal of  Japan Audio Society, 19, 1987/05

  (JP) Consideration of Assisted Acoustics   - Reverberation Control -   part 1

                    Preprint of the conference of Acoustical Society of Japan, 1987/10

  (JP) Consideration of Assisted Acoustics   - Application for large spaces -  part2

                    Preprint of the conference of Acoustical Society of Japan, 1987/10

  (JP) Consideration of Assisted Acoustics   - Relationship with Room Acoustics -  part3

                    Preprint of the conference of Acoustical Society of Japan, 1988/03

  (JP) Enhancement of "Reverberation" by electro-acoustic means

                   Electro-acoustic Committee, 1987/11

  (JP) Active Sound Field Control for large space  - AFC for Tokyo Gymnasium -

                   Preprint of the conference of Acoustical Society of Japan, 1991/03

  (JP) Consideration of the stability evaluation for the Assisted Acoustics System  

                   Preprint of the conference of Acoustical Society of Japan, 1993/03

  (JP) A consideration on time-variant method for expanding the controllability

                  of the Assistance of Sound Field with electro-acoustic means

       - On the stability control with time-variant FIR filter and spatial averaging method -

                   Preprint of the conference of Acoustical Society of Japan, 1996/09

  (JP) Assistance of Sound field for the large space

                    Architectural Acoustics Committee of Acoustical Society of Japan, 1997/3

  (JP) Improvement of  Room Acoustics by electro-acoustic means

       - Application for Multi-purpose Hall -   Acoustic Technology, no.108,1999/12

  (Eng.) Active Field Control in Auditoria

                     F.kawakami, Y.Shimizu, Applied Acoustics 31,47-75,'90

2. Sound Field Simulation

  (JP) Subjective impression due to the incident angle of the single echo - Spatially Averaged Trangent                

      Frequency Response Measurement -Preprint of the conference of Acoustical Society of Japan, 1983/10

  (JP) Consideration of simulating the sound field   - Sound Field Synthesizer -  part 1

                  Architectural Acoustics Committee of Acoustical Society of Japan, 1986/4

  (JP) Consideration of simulating the sound field   - Reproduction of the "Spatial Impression" - part2

                  Preprint of the conference of Acoustical Society of Japan, 1986/04

  (JP) Consideration of simulating the sound field   - Reproduction of incident angle in the sound reflection  

                  Preprint of the conference of Acoustical Society of Japan, 1988/10  

  (JP) Evaluation of the Recording & Reproduction System for the Reproduction of the Sound Field

                   Preprint of the conference of Acoustical Society of Japan, 1989/03

  (JP) Fundamental Study of Multi-Channel Room Simulator for the Hi-fidelity Sound Field Reproduction

                    Research Report of the Broadcasting Foundation, no.11,1989

 (Eng.) New Digital Reverberation System with excellent control capability of early reflection    

                   K.Niimi, Y.Shimizu,  preprint of AES, 1985

3. International Conference

1998

1. Y. Shimizu, S. Yamashita, F. Kawakami, et.al., Active Field Control for Tokyo International Forum facilities by Electro-acoustics Means,

 16th International Congress on Acoustics, 1998, pp.2115-2116

2001

2. Y. Shimizu, Consideration of the propagation loss of the direct sound with change in seat conditions, 

141st Meeting, Acoustical society of America, J. Acoust. Soc. Am., Vol. 109, No.5, Pt.2, May 2001, p.2284

3. Y. Shimizu, A consideration on physical tuning for acoustical coloration in recording studio,

 141st Meeting, Acoustical Society of America, J. Acoust. Soc. Am. Vol. 109, No.5, Pt.2, May, 2001, p.2264

2002

4. Y. Shimizu, Investigation of Reverberation synthesized by electro-acoustic enhancement systems, from a subjective and physical standpoint,

 143rd Meeting, Acoustical Society of America, J. Acoust. Soc. Am. Vol.111, no.5, Pt.2, May, 2002, p.2441

5. Y. Shimizu, A. Stephaniw, D. Lodico, R. Torres, The influence of spatialized background noise on ease of hearing in rooms,

 144th Meeting, Acoustical Society of America, J. Acoust. Soc. Am. Vol. 112, No.4, Pt2,, November 2002 p.2200

2003

6. Y. Shimizu, A consideration on physical tuning for acoustical coloration in recording studio,

 145th Meeting, Acoustical Society of America, J. Acoust. Soc. Am. Vol.113, No.4, Pt.2, April, 2003, p.2273

7. Y. Shimizu, Variable acoustics in small rooms for music,

 146th Meeting, Acoustical Society of America, J. Acoust. Soc. Am. Vol.114, No.4, Pt.2, October, 2003, p.2315

2004

8. A. Ito, Y. Shimizu, Active Control for Piano Room,

 147th Meeting, Acoustical Society of America, J. Acoust. Soc. Am. Vol. 115, No.5, Pt.2, May 2004, p.2514

2008

9. Y. Shimizu, M. Fujiwara, A. Ito, Case study of assessing audibility by “Perspicuity” for sounds added to Factory Noise, using different types of speaker in directional performance,

 Acoustics’08 Paris, J. Acoust. Soc. Am. Vol. 123, No.5 Pt2, May 2008 p.2981

10. Y. Shimizu, M. Hata, A. Ito, M. Hatanaka, Dynamic sound image creation by uni-directional sound beam reproduction toward an interior surface with a DSP controlled line array speaker for surround sound composition, Acoustics’08 Paris, J. Acoust. Soc. Am. Vol. 123, No.5 Pt2, May 2008 p.2980

11. Y. Shimizu, H. Furuya, Three dimensional representation method for a public indoor sound scape with multiple sound sources, Acoustics 2012, Hong Kong, 2012, 05

12. Y. Shimizu, Y. Honji, F. Kawakami, Acoustical design of the Concert Hall in Niigata Performing Arts Center - New acoustical design criteria for Surround Concert Hall -, International Symposium on Room acoustics, 2004

13. Y. Shimizu, M. Fujiwara, Speech Privacy in Japan, Relevant Feeling Evaluation and enhancement, Internoise 2009, 08, pp14. Y. Shimizu, R. Okuma, Influence of Auditory Sound Width on Speech Intelligibility in a Public Space, Internoise 2009, 08

Honors and Awards

  Technical Award from Acoustical Society of Japan

            for the acoustical consultation of Tokyo International Forum,1998

  Jury of Architecture Design Competition, Fukuroi Performing Arts Center, Japan 1997

External Research Funding

  Bass Foundation Research Gift, 1999-2002

  NYSTAR EQS Center, Grant for Facilities and Equipment, awarded 2001.

  National Endowment for the Arts, Preservation and Heritage Grant, pending.

Graduate and Ph.D students Advisor

  Ph. D students: (Rensselaer Polytechnic Institute)

One Student

  Ph.D students: (Tokyo Institute of Technology)

              Two Students

  Graduate students: (Rensselaer Polytechnic Institute)

Four Students

Graduate Students: (Tokyo Institute of Technology)

               Six students