An examination was made of the acoustic characteristics of wind turbulence generated noise in a car traveling at 70 mph over smoothly paved highway with the driver's window down. The overall noise level was found to be at 112 dB SPL with the predominance of energy in the low frequencies. The study was concerned with the effects of such noise on human audition in terms of temporary threshold shift.
Twenty normal hearing young adults were exposed to a tape recording of wind noise for 15 minutes. Post-exposure auditory thresholds at seven discreet frequencies were compared to pre-exposure auditory thresholds at the same seven frequencies. Threshold shift was taken as the difference between pre-exposure and post-exposure thresholds. Post-exposure thresholds were obtained immediately after exposure and at five, ten and fifteen minutes after exposure.
The results of the study indicate to significant difference in the amount of threshold shift or the rate of recover based on sex.
A significant difference was observed int he amount of threshold shift at different test frequencies. The rate of recovery at different test frequencies was also significantly different.
Decisions of significance were made at the .01 level of confidence. The statistical tool utilized was analysis of variance.
| Identifer | oai:union.ndltd.org:UTAHS/oai:digitalcommons.usu.edu:etd-4067 |
| Date | 01 May 1972 |
| Creators | Nelson, William Roy |
| Publisher | DigitalCommons@USU |
| Source Sets | Utah State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | All Graduate Theses and Dissertations |
| Rights | Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact Andrew Wesolek (andrew.wesolek@usu.edu). |
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