Committee |
Date Time |
Place |
Paper Title / Authors |
Abstract |
Paper # |
EA |
2014-06-27 13:00 |
Mie |
Mie Univ. |
Loudspeaker systems for low frequency radiation by rotational type piezoelectric ultrasonic actuators Daichi Nagaoka (Tokyo Univ. of Tech.), Juro Ohga (Shibaura Inst. of Tech./MIX Corp.), Hirokazu Negishi (MIX Corp.), Ikuo Oohira, Kazuaki Maeda (TOA), Kunio Oishi (Tokyo Univ. of Tech.) EA2014-5 |
Conventional electrodynamic loudspeakers actuated by a permanent magnet and a coil seem almighty.However,they include fu... [more] |
EA2014-5 pp.1-6 |
EA |
2010-10-22 13:25 |
Ishikawa |
Kanazawa-city Omi-cho Koryu Plaza |
Improvement of driving contractions for loudspeakers by ultrasonic motors Juro Ohga (Shibaura IT/MIX Lab.), Hirokazu Negishi (MIX Lab.), Ryousuke Suzuki, Gen Takeda, Hiroki Saito, Tatsuya Egawa (Chiba IT), Ikuo Oohira (I.B.), Kazuaki Maeda (TOA), Hajime Kubota (Chiba IT) EA2010-77 |
The project team of authors are studying direct-radiator-loudspeakers by using two sorts of piezoelectric ultrasonic mot... [more] |
EA2010-77 pp.115-120 |
EA |
2008-03-07 11:10 |
Tokyo |
NTT Musashino R&D Center |
Analysis of effect of physical parameters on human ear response of intraconcha and insert headphones Megumi Kobayashi, Yusuke Yanagida, Juro Ohga (Shibaura IT), Ikuo Oohira (Ashida Sound Co.) EA2007-116 |
Although a variety of headphones is increased, fundamentals of design method for them are still not established, and als... [more] |
EA2007-116 pp.25-30 |
EA |
2008-03-07 12:30 |
Tokyo |
NTT Musashino R&D Center |
[Invited Talk]
[Invited paper] How to understand operation and usage of headphones and earphones
-- Results of study with my students -- Juro Ohga (Shibaura IT) EA2007-117 |
Understanding of physical nature of headphones and earphones has been one of important research items for the author and... [more] |
EA2007-117 pp.31-36 |
EA |
2008-03-07 13:40 |
Tokyo |
NTT Musashino R&D Center |
Proposal of new measuring method for headphones and earphones Kiyofumi Inanaga, Takeshi Hara (SONY Corp.), Gunnar Rasmussen (GRAS), Yasuhiro Riko (Riko Associates), Juro Ohga (SIT), Ikuo Oohira (Ashida Sound) EA2007-118 |
Currently various types of acoustic coupler has been specified and employed in measuring headphones and earphones. Beca... [more] |
EA2007-118 pp.37-42 |
EA, SIP |
2007-05-25 11:30 |
Osaka |
Osaka Univ. |
Prediction of Howling for a Sound System in an Acoustical Environment with both Reverberant and Direct Sounds Hideki Akiyama, Juro Ohga (Shibaura Inst. of Tech.) EA2007-21 SIP2007-25 |
This report gives a quantitative howling occurrence prediction method for a sound system in an acoustical environment wi... [more] |
EA2007-21 SIP2007-25 pp.21-26 |
EA, SIP |
2007-05-25 14:00 |
Osaka |
Osaka Univ. |
Direct radiator loudspeaker by continuous revolution of ultrasonic motor Yuta Ohnuma, Yusuke Iwaki, Juro Ohga (Shibaura IT), Hirokazu Negishi (Essex Univ.), Toshio Sashida (Shinsei Co.), Kazuaki Maeda (TOA) EA2007-24 SIP2007-28 |
The loudspeaker using continuous revolution of an ultrasonic motor, proposed by the authors, is suitable to radiate soun... [more] |
EA2007-24 SIP2007-28 pp.39-44 |
EA |
2007-03-16 14:00 |
Tokyo |
Kikai-Shinko-Kaikan Bldg. |
Evaluation methods for ultra-small size loudspeaker units Takashi Sugawara, Keiichi Imaoka, Chikara Yoshida, Juro Ohga (SIT) |
This paper describes investigation of measuring methods of small size loudspeaker units for mobile equipment. Although c... [more] |
EA2006-115 pp.35-39 |
EA |
2006-12-15 13:00 |
Kyoto |
NTT Communication Science Laboratories (Keihanna) |
[Memorial Lecture]
Acoustical technology for telephone in my experience Juro Ohga (Shibaura IT) |
[more] |
EA2006-93 pp.25-30 |
EA |
2006-03-13 10:00 |
Tokyo |
|
Analysis of physical characteristics of supra-aural headphones by examination of acoustical parameters Chika Takahashi, Megumi Kobayashi, Juro Ohga (S.I.T.), Ikuo Oohira (Ashida Sound Co.,Ltd.) |
This paper describes analysis of headphones to clarify most important parameters for design. As the physical relationshi... [more] |
EA2005-106 pp.11-16 |
EA |
2006-03-13 14:35 |
Tokyo |
|
[Special Invited Talk]
Acoustical technology in industrial and telecommunication fields
-- On the international standardization of electroacoustical transducers -- Juro Ohga (S.I.T) |
[more] |
EA2005-111 pp.41-44 |
EA, US (Joint) |
2006-01-26 13:00 |
Kyoto |
|
Diaphragm parameters and radiation characteristics of small size piezoelectric ceramic loudspeakers Jun Fujii, Syun-ichirou Abe, Juro Ohga (SIT), Ikuo Oohira (Ashida Sound Co.,), Norikazu Sashida (Taiyo Yuden Co.,) |
This paper presents diaphragm parameters and analysis of radiation characteristics for small size loudspeaker by a multi... [more] |
EA2005-88 pp.1-6 |
EA |
2005-06-24 14:00 |
Saitama |
|
Wideband piezoelectric rectangular loudspeaker using a tuck shape PVDF bimorph Toshinori Ouchi, Juro Ohga (S.I.Tech), Toshitaka Takei (Take T Co.), Nobuhiro Moriyama (Kureha Chemical Industry Co.) |
[more] |
EA2005-21 pp.7-12 |
EA, SIP |
2005-05-20 11:00 |
Hyogo |
|
A study on dynamic distortion measurement for acoustical systems by digital technology Keiichi Imaoka, Juro Ohga (S. I. Tech.) |
There is still no suitable measuring method by a digital processing system for nonlinear distortion of acoustical device... [more] |
EA2005-15 SIP2005-20 pp.13-18 |
EA, SIP |
2005-05-20 11:30 |
Hyogo |
|
Effect of acoustic load parameters for frequency response of headphones Chika Takahashi, Juro Ohga (S. I. Tech), Ikuo Oohira (Ashida Sound) |
This paper describes three sorts of measurements made on headphones to clarify most important parameters for design. Rec... [more] |
EA2005-16 SIP2005-21 pp.19-24 |
EA |
2005-01-28 15:20 |
Osaka |
Kansai Univ. |
Temperature Characteristics of a Electret Condenser Microphone Yoshinobu Yasuno (Panasonic SCDS), Eri Ishizeki, Juro Ohga (SIT) |
Electret condenser microphones (ECMs) are used widely after 1985 years by the diffusion of the electrification telepho... [more] |
EA2004-134 pp.57-62 |