Date of Award:

5-1972

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Communicative Disorders and Deaf Education

Department name when degree awarded

Communicative Disorders

Committee Chair(s)

Steven H. Viehweg

Committee

Steven H. Viehweg

Committee

Richard D. Taylor

Committee

Larry S. Cole

Abstract

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 in the 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.

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