2012 Fiscal Year Final Research Report
Measurement of sound field and intelligibility of speech in snow
| Project/Area Number |
23651182
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Natural disaster science
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| Research Institution | Health Sciences University of Hokkaido |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
AMANO Shigeaki 愛知淑徳大学, 人間情報学部, 教授 (90396119)
YAMAKAWA Kimiko 愛知淑徳大学, 人間情報学部, 助教 (80455196)
MAKI Katuhiro 愛知淑徳大学, 人間情報学部, 准教授 (50447033)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 雪氷災害 / 音声 / 明瞭度 / 音場 |
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| Research Abstract |
In this research project, acoustic characteristic of sound insulation of two different snow packs: (1) a natural snow pack; and (2) a compressed snow pack by stomping, were measured. Acoustic characteristics of a compressed snow pack directly vibrated by stomping on surface and sticking with ski poles were also measured. In the case of a natural snow pack, the relative power of a high-frequency range was attenuated more than that of a lower-frequency range, and in the case of a compressed snow pack, the relative power was uniformly attenuated across a wide frequency range. In a compressed snow, attenuation reached to more than 40 dB uniformly in all frequency domains. On the other hands, in a method directly vibrating a snow pack, such as ski-pole sticking and stomping, sound pressure level measured at 30 cm depth was about 20 dB greater than the MAF (minimum audible field) across a wide frequency domain. Furthermore, even if a vibrating point was 1 m far from the position of a microphone in a horizontal direction, sound pressure level at 60 cm was 10 dB greater than the MAF at 1000Hz. The results suggest that sticking with ski poles is effective to send sounds to a burial, and much better than voice call.
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