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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 16 of 16  /   
Committee Date Time Place Paper Title / Authors Abstract Paper #
EA 2014-06-27
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
EA 2010-10-22
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
EA 2008-03-07
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
EA 2008-03-07
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
EA 2008-03-07
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
EA, SIP 2007-05-25
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
EA, SIP 2007-05-25
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
EA 2007-03-16
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
EA 2006-12-15
Kyoto NTT Communication Science Laboratories (Keihanna) [Memorial Lecture] Acoustical technology for telephone in my experience
Juro Ohga (Shibaura IT)
 [more] EA2006-93
EA 2006-03-13
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
EA 2006-03-13
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
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
EA 2005-06-24
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
EA, SIP 2005-05-20
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
EA, SIP 2005-05-20
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
EA 2005-01-28
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
 Results 1 - 16 of 16  /   
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