1992 Fiscal Year Final Research Report Summary
Fundamental Study on New Sound Level Meter Based on "Urusasa" and/or "Hues" Noise-Rating Scales
| Project/Area Number |
03650273
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子通信系統工学
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| Research Institution | Shinshu University |
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Principal Investigator |
YANAGISAWA Takesaburo Shinshu University, Faculty of Engineering, Professor, 工学部, 教授 (50020970)
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| Co-Investigator(Kenkyū-buntansha) |
FURIHATA Kenji Shinshu University, Faculty of Engineering, Assistant, 工学部, 助手 (90021013)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Unwanted sound / Noise / L_<Aeq(5min)> (dB) / Psychological scale / Annoyance ("urusasa") / "Urusasa" noise-rating scale / "Hues" noise-rating scale / Noise sound level meter |
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| Research Abstract |
The equivalent continuous A-weighted sound pressure level (L_<Aeq.T>) is proposed internationally as a physical scale of environmental noise and adopted to JIS. However, the non-specialists for acoustics are lacking in understanding for the dB-number represented by L_<Aeq.T>. Therefore, in order to help them to understand the mean of the number in dB, it is the best conceivable method to represent a correlation between the degrees of psychological effects caused by various kinds of noise sources and L_<Aeq.T>.
1. In deriving the relation between an reported annoyance ("urusasa") scale and L_<Aeq(5min)> that we composed independently, two assumptions are fulfilled : (1) The residents in a community use a few common rating words ("urusai" and "kininaranai") for representing psychological effects caused by various kinds of noise sources through their typical total daily sound environment. (2) They give words to degrees of the rating words based on their auditory impression to the noise energy.
2. We investigated experimentally a relation between auditory sensations to noise sound and visual hues. The results give the high correlation between a five-hues (red, purple, yellow, green, blue) scale chosen and L_<Aeq(5min)> for various kinds of noise sources.
3. We produced new noise sound level meter used a color liquid crystal display based on the relations between a "urusasa" scale and/or a "five-hues" scale on the vertical axis and L_<Aeq(5min)> on transverse axis. As a result, it is clarified that the combination of the "urusasa" scale and the "hues" scale on the vertical axis is the most available to understand the mean of L_<Aeq.T> (dB).
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