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A critical analysis of attenuation effects of different types of ear protective devices
Indian Journal of Otolaryngology, 1991The present study was undertaken to evaluate the noise attenuation characteristics of different types of Ear protective Devices which are commonly used. 20 healthy normal subjects’ open and closed hearing thresholds (with the usage of ear protective device) were recorded in an anechoic chamber and the attenuation charactaristics at 8 discrete ...
A. B. Rao, BN Pranesh Rao
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On the Behavior of Ear Protection Devices below 1000 cps
The Journal of the Acoustical Society of America, 1958An extensive set of measurements has been made on various type of ear protection devices, generally consisting of a hard-shelled volume coupled to the head by an annular pad filled with various materials. Attenuation measurements were made with a miniature pressure microphone.
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The Journal of the Acoustical Society of America, 2014
Hearing protection devices are increasingly designed with the capability to protect against impulsive sound. Current methods used to test protection from impulsive noise, such as blasts and gunshots, suffer from various drawbacks and complex, manual experimental procedures.
Theodore F. Argo, G. Douglas Meegan
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Hearing protection devices are increasingly designed with the capability to protect against impulsive sound. Current methods used to test protection from impulsive noise, such as blasts and gunshots, suffer from various drawbacks and complex, manual experimental procedures.
Theodore F. Argo, G. Douglas Meegan
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Calibration of an In-Ear Dosimeter for a Single Hearing Protection Device
2014Abstract : Military personnel working in high noise environments could be exposed to noise levels up to 150 dB. Daily noise exposure limits are based on both ambient noise levels and the duration of time spent in that noise environment. NAVAIR led ATI in the development of a ship-suitable in-ear dosimeter integrated into a single hearing protector, and
Valerie S. Bjorn +3 more
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The Journal of the Acoustical Society of America, 1962
The attenuation of two different earplugs and a helmet was measured by a procedure combining the free-field threshold shift and the Békésy threshold tracking methods. Subjects were then exposed to impulse noise which would produce between 12 and 64 dB TTS at 6000 cps unprotected and their TTS was subsequently measured after identical exposure during ...
J. L. Fletcher, M. Loeb
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The attenuation of two different earplugs and a helmet was measured by a procedure combining the free-field threshold shift and the Békésy threshold tracking methods. Subjects were then exposed to impulse noise which would produce between 12 and 64 dB TTS at 6000 cps unprotected and their TTS was subsequently measured after identical exposure during ...
J. L. Fletcher, M. Loeb
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Effects of Ear Protective Devices on the Intelligibility of Speech in Noise
The Journal of the Acoustical Society of America, 1946Articulation tests were conducted to determine the intelligibility of speech in the presence of noise when listeners did not wear earplugs and when listeners wore earplugs (NDRC Ear Wardens). It was found that with a reverberating signal from a public-address system and in the presence of noise that raises the open-ear speech threshold by 60 db or more,
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The Journal of the Acoustical Society of America, 1956
The sound-exclusion properties (acoustic attenuation) of various earphones and ear defenders and combinations thereof were determined by the binaural, free-field, absolute-threshold-shift technique with the psychophysical method of adjustment. The earphones included dynamic earphones in two different sockets and hearing-aid-type receivers with ...
J. C. Webster +2 more
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The sound-exclusion properties (acoustic attenuation) of various earphones and ear defenders and combinations thereof were determined by the binaural, free-field, absolute-threshold-shift technique with the psychophysical method of adjustment. The earphones included dynamic earphones in two different sockets and hearing-aid-type receivers with ...
J. C. Webster +2 more
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The Journal of the Acoustical Society of America, 2018
The objective of this paper is to present a new finding on the effects of hearing protection devices (HPDs) on the ear canal (EC) transfer function (TFEC2ED). Specifically, we show that when an earmuff is worn, the TFEC2ED is not the same as that for the bare head, leading to a significant difference in cochlear injury prediction.
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The objective of this paper is to present a new finding on the effects of hearing protection devices (HPDs) on the ear canal (EC) transfer function (TFEC2ED). Specifically, we show that when an earmuff is worn, the TFEC2ED is not the same as that for the bare head, leading to a significant difference in cochlear injury prediction.
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Noise Attenuation of Ear-Protective Devices
Sound: Its Uses and Control, 1962J. C. Webster, E. R. Rubin
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This work will describe the experimental evaluation of blast loadings on post mortem human surrogates instrumented to obtain pressure and strain measurements at various locations as a precursor to studies on biological models to investigate neurological damage to the auditory cortex.
Tim J. Walilko +5 more
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Tim J. Walilko +5 more
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