Preliminary study of the effect of the spectral content of impulsive noises on the acquisition of auditory fatigue
Keywords:
acoustic noise, biological effects of acoustic radiation, hearing, spectral content, impulsive noises, auditory fatigue, temporary threshold shift, frequency bandwidths, 300 to 1000 Hz, 300 to 3000 Hz, 300 to 4000 HzAbstract
With the development of a computerized impulsive noise generator, it has become possible to study the effect of the spectral content of impulsive noises by measuring temporary threshold shift (TTS). To conduct this type of study, a new methodology had to be developed for obtaining a target amount of asymptotic threshold shift in a minimum exposure time. This methodology has been tested with three impulse signals of different frequency bandwidths: signal A extending from 300 to 1000 Hz signal B from 300 to 3000 Hz and signal C from 300 to 4000 Hz. The TTS growth curves reach an asymptote of about 10 dB after an exposure time of approximately 30 minutes. To obtain this effect, the peak level of signals B and C had to be 0 to 12 dB below that of signal A. Thus, it appears that the spectral content is a very important parameter in the prediction of damage risks to hearing from impulsive noise
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