TY - GEN
T1 - Investigation on VHF sounds in the ears project Japan - part1
AU - Ueda, Mari
AU - Harada, Rikuo
AU - Kiriyama, Riku
AU - Hiroe, Masaaki
AU - Hasegawa, Hideyuki
AU - Nakamura, Kentaro
AU - Kanzaki, Syo
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Number JP19K02599 and some companies.
Funding Information:
This work was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research 2019-2019（JP19K02599, Mari Ueda） and some companies. 3. PURE-TONE HEARING THRESHOLD ON VHF SOUND Example of the hearing threshold on VHF sound, two or more trials were conducted at each frequency, and the average of measured values was determined as the threshold[10]. Furthermore, any measured value that exceeded a sound-pressure level of 90 dB even once was scaled out. As described above, measured values using the method of limits are strongly influenced by cognitive bias. Therefore, to determine whether or not a participant’s response was reliable, catch trials were used. A catch trial is the same as an ordinary trial, except no sound stimuli are presented. Therefore, when participants respond based on their predictions and beliefs, their responses also appear during catch trials. In this study, some participants made such responses during catch trials. Data of these participants were discarded, due to their low reliability. Figure 2 presents the thresholds of 21 participants (including seven female participants); four were judged to be unreliable and were excluded. These participants were grouped as follows: ages 6 to 8 (five participants), ages 9 to 11 (nine participants), and ages 12 to 15 (seven participants). Here, × indicates the thresholds of the male participants, and ○ indicates those of the female participants. The solid line in the figure represents the threshold of a healthy person who hears a pure tone in a free-sound field, as specified in ISO 389-7.
Publisher Copyright:
© Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.
PY - 2020/8/23
Y1 - 2020/8/23
N2 - We have reported the recent activities for research on very-high-frequency (VHF) sound in Japan. In this paper (part-1), we introduce the background, summary of our investigation and the result of subjective hearing threshold in such VHF region. The issues on high pressure of VHF sounds including ultra sounds in air that cause various subjective effects have become important around all world. Similar problems on VHF sounds, for example, noise annoyance by VHF sounds radiated from rodent repelling devices, were emerging also since about 10 years ago in Japan. The ears project Japan which have been established against such issues in recent years decided to conduct VHF research, measurement and evaluation in Japan. We introduce summary of the ears project Japan and measured results of subjective threshold in VHF region positioned as part of most important research issue.
AB - We have reported the recent activities for research on very-high-frequency (VHF) sound in Japan. In this paper (part-1), we introduce the background, summary of our investigation and the result of subjective hearing threshold in such VHF region. The issues on high pressure of VHF sounds including ultra sounds in air that cause various subjective effects have become important around all world. Similar problems on VHF sounds, for example, noise annoyance by VHF sounds radiated from rodent repelling devices, were emerging also since about 10 years ago in Japan. The ears project Japan which have been established against such issues in recent years decided to conduct VHF research, measurement and evaluation in Japan. We introduce summary of the ears project Japan and measured results of subjective threshold in VHF region positioned as part of most important research issue.
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M3 - Conference contribution
AN - SCOPUS:85101341606
T3 - Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
BT - Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
A2 - Jeon, Jin Yong
PB - Korean Society of Noise and Vibration Engineering
T2 - 49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020
Y2 - 23 August 2020 through 26 August 2020
ER -