Kyushu University Academic Staff Educational and Research Activities Database
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Kazuhiko Kawahara Last modified date:2017.10.29

Assistant Professor / Sound Culture / Art Management
Department of Communication Design Science
Faculty of Design


Graduate School
Undergraduate School


E-Mail
Homepage
http://www.design.kyushu-u.ac.jp/~kawahara/
web page of Kawahara .
Academic Degree
Ph.D. in Design
Field of Specialization
Performance Evaluation of Acoustic Engineering System
Outline Activities
Loudspeaker Performance Evaluation:

Distributed mode loudspeaker(DML), a new class of transducer, use
bending wave of diaphragm to radiate sound.
Its radiation characteristics
is said essensially diffrent from conventional loudspeakers'.
we are trying to evaluate the performance by measuring sound intensity dirtribution in near-field of
a distributed mode loudspeaker. And we made a comparison with
sound intensity dirtribution of conventional loudspeakers.
In a case of DML, at lower frequencies, complex distribution of
mean sound intensity was observed. It looked like the distribution of interfered sound field.
And it showed the diffrence from that of conventional loudspeaker.
Research
Research Interests
  • Curriculum development of Technical Listening Traing
    keyword : Ear training, Education in Acoustic
    1990.04~2018.05.
  • Performance evaluation of Acoustic Engineering System
    keyword : Acoustic system, Transducers, Performance evaluation
    2001.04Performance evaluation of Acoustic Systems, electro-acoustic transducers.
Academic Activities
Papers
1. Kazuhiko Kawahara, Masayuki Takada, Shin-ichiro Iwamiya, Transferring technical listening training curriculum at the Department of Acoustic Design, Kyushu University, to a corporation in the acoustics industry, Acoustical Science and Technology, 37, 4, 2016.07.
2. Kazuhiko Kawahara, Masayuki Takada, Shin-ichiro Iwamiya, (ACOUSTICAL LETTER)Training course for instructors of Technical Listening Training, Acoustical Science and Technology, 37, 4, 2016.07.
3. Customized System for Technical Listening Training at Department of Acoustic Design, Kyushu University.
4. Introduction of "Technical Listening Training" as the First Class of the Specialized Curriculm of Department of Acoustic Design.
5. KIM KIHONG, Kazuhiko Kawahara, Shin-ichiro Iwamiya, (Acoustical Letter)Case study of acoustic education for Korean music majors, Acoustical Science and Technology, 35, 1, 2014.01.
Works, Software and Database
1. .
Presentations
1. Moe Nishikawa, Kazuhiko Kawahara, Yutaka Kamamoto, Akiho Fujimori, Akira Omoto, Takehiro Moriya, Extraction of Applause from a Sound Field for Ambient Transmission in a Live Viewing System, 2017 IEEE 6th Global Conference on Consumer Electronics (GCCE2017) (pp.235-237 ), 2017.10.25.
2. What can we make kids to explore in the anechoic chamber?.
3. Extraction of Applause from a Sound Field for Ambient Transmission in a Live Viewing System.
4. The evaluation of guessing the number of applauding people for applause sound synthesis..
5. Pilot study of applause detection for applause and handclap feedback on live viewing..
6. A directional microphone application to Applause and Clapping Reproduction System for Live Viewing.
7. Kazuhiko Kawahara, Masayuki Takada, Shin-ichiro Iwamiya, TECHNICAL LISTENING TRAINING AS AN ADVANCED ACOUSTIC EDUCATION PROGRAM, Youngnam Kyushu Joint Conference on Acoustics 2017 (J2), 2017.02.04.
8. Comparison and investigation of sound field isotropy with various measurement systems.
9. Kazuhiko Kawahara, Masayuki Takada, Shin-ichiro Iwamiya, Advanced Technical Listening Training Program at Kyushu University, 5th joint meeting of the Acoustical Society of America and the Acoustical Society of Japan, 2016.11.28.
10. Kazuhiko Kawahara, Akiho Fujimori, Yutaka Kamamoto, Akira Omoto, Takehiro Moriya, Implementation and demonstration of applause and handclapping feedback system for live viewing(e-Brief 299), Audio Engineering Society 141st Internatinal Convention, Los Angeles 2016, 2016.10.01.
11. Sungyoung Kim,, Mark Bassett, Jason Corey, Kazuhiko Kawahara, Sean Olive, Critical Listening: Ear Training in Audio Education, 141st Audio Engineering Society Convention, 2016.10.02, [URL].
12. Design and Implementation of Applause and Clapping Reproduction System for Live Viewing.
13. Pilot study of applause and handclap feedback on live viewing..
14. Education for acoustic engineers and sound designers in Department of Acoustic Design, Kyushu University..
15. Case study of Electro-Acoustic Education in Acoustic Experiments at the Department of Acoustic Design, Kyushu University.
16. Pilot study of applause sound generator depending on the listening environment.
17. Investigation of active diffusibility control in enclosed sound field
-Control of acoustic mode in small sized reverberation chamber
and possibility of multi-channel reproduction system-.
18. Kosuke Goto, Kazuhiko Kawahara, Design and Performance Evaluation of a Stereo Sound Reproduction System with a Complementary Distributed Mode Loudspeaker, 2015 IEEE 4th Global Conference on Consumer Electronics (GCCE) (pp. 34-37), 2015.10.27.
19. Basic study for realization of an active reverberation box. - Effect of location and dimension of sound sources on the generated sound field -.
20. Kazuhiko Kawahara, Yutaka Kamamoto, Akira Omoto, Takehiro Moriya, Evaluation of the Low-Delay Coding of Applause and Hand-Clapping Sounds Caused by Music Appreciation(#9225), Audio Engineering Society 138th Internatinal Convention Warsaw 2015, 2015.05.07.
21. Vibro-acousitic analysis of a Distributed Mode Loudspeakers introducing viscoelastic properties in its support condition.
22. A study on changes of impressions by introducing “Equalization” in sound field reproduction system.
23. Michiaki Takahashi, Kazuhiko Kawahara, Akira Omoto, COMPARISON OF HOWLING MARGIN IN VARIABLE REFLECTION ACOUSTIC WALL SYSTEM WITH SEVERAL ADAPTIVE ALGORITHMS, Kyushu-Youngnam Joint Conference on Acoustics 2015, 2015.01.10.
24. Technical Listening Training as an acoustic education for freshmen. -System design and evaluation from questionnaire-.
25. Kazuhiko Kawahara, Impression measurement of three different types of loudspeakers’ sound field, 2014 IEEE 3rd Global Conference on Consumer Electronics (GCCE) (pp.517-518), 2014.10.09.
26. Kazuhiko Kawahara, Shin-ichiro Iwamiya, Masayuki Takada, (Invited)Educational Aim and Uniqueness of Technical Listening Training(PJ08-3), 7th Forum Acousticum, (P.1-4), 2014.09.09.
27. A study of variable acoustic wall system :In case of distributed mode loudspeakers..
28. Fundamental evaluation for the low-delay coding of applause and hand-clapping sounds caused by
music appreciation.
29. Vibro-acoustic analysis of Distributed Mode Loudspeaker..
30. DAW application to ear training..
31. A study on the relationship between TLT subject’s performance and their backgrounds.
32. On curriculum of technical listening training..
33. Methods for analyzing vibration characteristics of Distributed Mode Loudspeakers, IEICE Technical Report EA2013-85, pp. 101-106.
34. Sungyoung Kim, Timothy J . Ryan, Jason Corey, Doyuen Ko, Kazuhiko Kawahara, Towards a Systematic Ear - Training Curriculum: Effective and Efficient Learning in Audio Education, AES 50th Conference—Audio Education, 2013.07.26.
35. Kazuhiko Kawahara, Masayuki Takada, Shin-ichiro Iwamiya, Effectiveness of technical listening training in Department of Acoustic Design
of Kyushu University, international congress on Acoustics 2013(3aED8), 2013.06.05.
36. Case study of Demonstration "Loudspeaker mechanism and measurement" for high school students
-- From "Acoustics and visual communication experiments for high school students" in Kyushu University --.
37. A report of acoustic education for fashion design major students.
38. Report of acoustic education for Korean students of music major: A case study of the 2011 school in
college of arts & graduate school of arts of Dong-A university..
39. Improvement of Speech Intelligibilty in a Concert Hall.
40. Sound Field Reproduction System Based on Variable Reflection Acoustic Wall System..
41. Acoustic response analysis of Distributed Mode Loudspeaker by the vibro-acoustic analysis..
42. Case study of introduction and planning of “2003 Spring Exibition: Sound and Technology” at The Saga Pref. Space & Science Museum.
43. A study on active noise control by multipole control sources..
44. Multipole End-Fire Loudspeaker Array Based on Spherical Harmonic Expansion..
45. Sound radiation synthesis by using multipole expression of spherical harmonic expansion..
46. Modal analysis and generated sound field simulation of a vibration panel. In case of in a free sound field an d in a rectangular enclosure
, IEICE Technical Report EA2010-89, pp.31-36.
47. The first step to frequency analysis..
48. Loudspeaker characteristic evaluation with cross correlation of inter radiation directional impulse responses.
49. Technology transfer of technical listening training education to employees of an acoustic related campany
-- case study i case of technology transter to Yamaha corporation --.
50. Technology transfer of technical listening training education to employees of an acoustic related campany
-- case study i case of technology transter to Yamaha corporation --.
51. An introduction of "Techincal Listening Training" to employees in acoustic related company.
52. Loudspeaker characteristic evaluation with coherent distance in reverberation room.
53. Loudspeaker characteristic evaluation with coherent distance in reverberation room.
54. Case study of acoustic education in
``Acoustics and visual communication experiments for high school students''.
55. Recent technologies for loudspeakers, Distributed mode panel loudspeaker.
Membership in Academic Society
  • Acoustical Society of Japan
  • The Insittute of Electronics, Information and Communication Engineers
Educational
Other Educational Activities
  • 2000.01.