著者
Yokota Takatoshi Sakamoto Shinichi Tachibana Hideki
出版者
一般社団法人 日本音響学会
雑誌
Acoustical Science and Technology (ISSN:13463969)
巻号頁・発行日
vol.23, no.1, pp.40-46, 2002 (Released:2002-02-08)
参考文献数
7
被引用文献数
20 36 58

This paper presents visualization of transient sound propagation in 2-dimensional room sound fields in which the typical shapes of concert halls are modeled by applying the finite difference time domain method. As a basic study on room acoustic design, sound propagation in rooms, scattering effect of acoustic diffusers and reflection characteristics of suspended panel arrays are investigated. Through the investigation, it has been confirmed that this kind of visualization technique is very effective to get intuitive comprehension of complex acoustic phenomena which occur in rooms. The technique can be useful tool for discussion on room and acoustic treatment between acoustic engineers and architects.
著者
越智 寛
出版者
一般社団法人 日本音響学会
雑誌
日本音響学会誌 (ISSN:03694232)
巻号頁・発行日
vol.72, no.9, pp.600-601, 2016-09-01 (Released:2017-07-01)
著者
Fumiaki Satoh Kimihiro Sakagami Akira Omoto
出版者
一般社団法人 日本音響学会
雑誌
Acoustical Science and Technology (ISSN:13463969)
巻号頁・発行日
vol.37, no.4, pp.165-172, 2016-07-01 (Released:2016-07-01)
参考文献数
11

In an introductory course for environmental/architectural acoustics in universities, it is often used the teaching method based on soundscape, in which students are asked to make a sound map with listening their surrounding acoustic environment. However, if objective measurement of sound pressure level or frequency spectrum can be introduced in such a course, it will interest students in environmental acoustics, and enable them to discuss the acoustic environment more profoundly. Measurement apparatuses are usually expensive and difficult to be used in such a course. Therefore, we consider to use a smartphone: using a smartphone with acoustic measurement applications, it can be possible to introduce an objective measurement in such an introductory course for beginners. In this study, first some applications for acoustic measurement are examined to confirm their accuracy as well as the effect of a simple handmade windscreen. Secondly, using suitable applications, as a possible work in the course, sound maps with measurement results by a smartphone are made and their examples are shown. Finally, some issues to introduce this method in actual courses are discussed.

11 0 0 0 OA 難聴と補聴技術

著者
伊東 慶太
出版者
一般社団法人 日本音響学会
雑誌
日本音響学会誌 (ISSN:03694232)
巻号頁・発行日
vol.74, no.8, pp.440-447, 2018-08-01 (Released:2019-02-01)
参考文献数
7
著者
Tetsunori Kobayashi Shinya Fujie
出版者
一般社団法人 日本音響学会
雑誌
Acoustical Science and Technology (ISSN:13463969)
巻号頁・発行日
vol.34, no.2, pp.64-72, 2013-02-01 (Released:2013-03-01)
参考文献数
22
被引用文献数
3 4

Functions have been implemented in various robots to enable them to follow a conversation protocol. The paralinguistic information involved in prosody and posture expression is used to improve the transparency of the conversational states, especially the protocol, thereby effectively contributing to natural and efficient communication. Information is communicated incrementally to enable error handling. Various rules for selecting conversation participants, forming a communication group, and turn-taking are followed. Since all the actions of a conversational robot are explicitly controlled, such robots should be useful for revealing important heretofore unknown conversational functions.
著者
田中 康裕
出版者
一般社団法人 日本音響学会
雑誌
日本音響学会誌 (ISSN:03694232)
巻号頁・発行日
vol.40, no.12, pp.830-836, 1984-12-01 (Released:2017-06-02)
被引用文献数
1
著者
Masahiro Harazono Daichi Kitamura Masashi Nakayama
出版者
一般社団法人 日本音響学会
雑誌
Acoustical Science and Technology (ISSN:13463969)
巻号頁・発行日
vol.33, no.5, pp.301-309, 2012-05-01 (Released:2012-09-01)
参考文献数
7

As a factor to characterize the sound of an electric guitar, it is thought that a characteristic of the pickup contributes most. The pickups most often used are classified roughly into single-coil models and humbucking models. The single-coil pickup is made by winding the thin wires with several thousand turns of coils around six polarizing pole pieces each corresponding to a string of the guitar, and the change in the magnetic reluctance owing to the string vibration that causes the change in the magnetic flux is transformed into an electrical signal. The humbucking pickup is composed of one magnetic circuit with two single-coil pickups, and made to be in phase electrically and out of phase magnetically for the purpose of removing circumference magnetic noise. In this paper, the response of the humbucking pickup excited by a string vibration set up by a real commercial solid body electric guitar is analyzed, and a simulation result is shown to agree with an actual measured value with sufficient precision. In addition, the response of the humbucking pickup imitated with two single-coil pickups is compared with the single-coil pickup and some additional considerations in the characteristics have been gained through analysis.
著者
Kenji Ishikawa Yasuhiro Oikawa Yoshio Yamasaki
出版者
一般社団法人 日本音響学会
雑誌
Acoustical Science and Technology (ISSN:13463969)
巻号頁・発行日
vol.36, no.5, pp.408-418, 2015 (Released:2015-09-01)
参考文献数
23
被引用文献数
1

Light propagating through a sound field is affected by variations in the density of the medium caused by sound. Therefore, acoustical measurements using light have been studied. The popular measurement methods use the phase shift of the transmitted light. Because they detect integrated acoustical quantities along the optical path of the detected light, time and effort are required to measure the quantities at a single point. On the other hand, single-point acoustical particle velocity measurement by light scattering has been proposed. Using light scattering enables the measurement of non-integrated quantities because the scattered light includes only the acoustical information at a scattering point. However, a method of non-invasive sound pressure measurement at a single point in a free field has not been established. This paper proposes sound pressure measurement at a scattering point, in which the light scattered by particles in the sound field is observed. The intensity of light scattered in the sound field indicates the sound pressure because the intensity of the scattered light is proportional to the density of scatterers. The theory of light scattering by sounds is formalized, and sound measurement experiments with light scattering are also conducted using water drops and air particles as scatterers.