Author:
Ordoñez Rodrigo,Hammershøi Dorte
Abstract
The time-frequency characteristics of Temporary Threshold Shifts (TTS) caused by pure tones were determined using the Békésy audiometric method with narrow-band noise of short duration as the probe stimuli. Two experiments were done using exposures of 3 min at 100 dB above
threshold. In the first experiment, the frequency dependent characteristics of TTS produced by a 500-Hz tone were assessed. Thresholds were determined from 0.25 to 2 kHz in 1/2-octave steps for up to 20 min after the exposure. The results showed that the maximum affected
frequency was 1/2 octave above the exposure frequency. In the second experiment, the TTS recovery curve produced by a 1-kHz pure tone exposure was assessed at 1.5 kHz, at approximately 15 s intervals for the first 5 min and at regularly increasing intervals up to 45 min after
the exposure. The results showed a maximum in the recovery around 2 min after the exposure. The data gathered in these experiments were used to construct a mathematical model of TTS recovery. The model describes both the 1/2-octave shift and the 2-min bounce and it can be
used in the comparison of temporary changes in the auditory function, assessed at different times and frequencies.
Publisher
Wissenschaftliche Verlagsgesellschaft mbH
Subject
Music,Acoustics and Ultrasonics
Cited by
3 articles.
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