The energy spectrum of an impulse: its relation to hearing loss.
Permanent threshold shifts obtained from 242 chinchillas that were exposed to various impulse noise paradigms have been related to the energy spectra of the impulses. The impulses were generated by three different shock tubes that produced impulse noise spectra whose A-weighted energies showed peaks at 0.25, 1, and 2 kHz. The results show that there is an increasing susceptibility to NIPTS as the audiometric test frequency increases from 0.5 to 16 kHz. This increase in susceptibility to NIPTS is further accentuated by approximately 5 to 10 dB for impulses whose spectra peak at 2 kHz.
Hamernik
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Auditory Research Laboratories, State University of New York, Plattsburgh 12901.
Ahroon
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Hsueh
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D000818:Animals; D001305:Auditory Fatigue / Q000502:physiology*; D002682:Chinchilla; D003051:Cochlea / Q000503:physiopathology*; D006317:Hearing Loss, Noise-Induced / Q000503:physiopathology*; D008144:Loudness Perception / Q000502:physiology; D008838:Microcomputers; D009622:Noise / Q000009:adverse effects*; D010898:Pitch Perception / Q000502:physiology; D011571:Psychoacoustics; D012307:Risk Factors; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D013018:Sound Spectrography / Q000295:instrumentation