IMPULSE DURATION AND TEMPORARY THRESHOLD SHIFT
ARMY MEDICAL RESEARCH LAB FORT KNOX KY FORT KNOX
Pagination or Media Count:
Subjects were exposed, on different test days, to 166 dB peak, normal incidence impulses 34, 58, 72, or 96 microsec in duration spaced 1 sec apart. For each pulse duration the subjects were first exposed to one pulse, then the number of pulses was doubled on successive days until the temporary threshold shift TTS following exposure exceeded 30 dB. Intercorrelations of numbers of impulses required to reach criterion TTS at each duration were obtained. There is reason to believe that if one exceeds allowable TTS in the speech range frequencies with this kind of impulse noise, there is a chance of producing permanent high frequency loss.