| Project/Area Number |
62480177
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
公衆衛生学
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| Research Institution | Kyoto University |
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Principal Investigator |
YAMAMOTO Takeo Faculty of engineering, Kyoto University. Professer, 工学部, 教授 (30025811)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAMATSU Kozo Faculty of Engineering, Kyoto University. Instructor, 工学部, 助手 (70026293)
TAKAGI Koichi Faculty of Engineering, Kyoto University. Associate Professer, 工学部, 助教授 (50026077)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1987: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | NIPTS / Industrial noise / Industrial hygiene / Speech perception / 許容基準 |
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| Research Abstract |
This study investigates the permanent threshold shift(PTS) of workers induced by industrial noise exposure and the relation between PTS and the impairment of speech perception. The results of the investigations and the experiments are as follows;
1. Hearing thresholds of 510 noise-exposed workers and 325 subjects without noise exposure are measured. 2. Noise exposure of each worker is measured by means of indivifual noise dose meter which gives equivalent continuous A-Weighted Sound Pressure Level over the particular averaging time. 3. Articulations of monosyllabic words using the subjects having noise-induced PTS as well as normal subjects are measured. It is found that speech hearing test using monosyllabic words is not sensitive to hearing impairment. 4. Articulations of trisllabic words using the hearing impaired and normal subjects having NIPTS are measured in the presence of ambient noise and in the condition of reverberation. The results show that the hearing impaired are more imfluenced by reverberation in speech perception. 5. Digital filter simulating the recruitment phenomenon is programmed and distroted vocal sounds presumed the hearing impaired might hear are synthesized. 6. Articulations of monosyllabic sounds synthesized as above are measured using normal subjects and the result expressed as speech audiogramme are compared with that of the fearing impaired using notdistorted vocal sounds. The result shows that both audiogrammes are in satisfactory agreement.
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