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Showing 1 to 20 of 20 for “"Hearing Protection Devices"”.
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Adjusting retrospective noise exposure assessment for use of hearing protection devices
… because they did not properly account for use of hearing protection devices (HPD) which would result in potential misclassification. Exposure misclassification has been shown to attenuate exposure-outcomes relations. In the case of already subtle relationships such as noise and cardiovascular …
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Evaluation of Military Hearing Protection Devices in a Simulated Aircraft Carrier Soundscape
… service members rely on to protect their hearing also convey deleterious effects on localization and situation awareness. Oftentimes, service members choose to improperly fit hearing protection, or forgo it entirely, to maintain situation awareness and better protect themselves against …
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The Detection of Warning Signals While Wearing Active Noise Reduction and Passive Hearing Protection Devices
… individuals wore an active noise reduction (ANR) hearing protection device (HPD), a passive HPD, or no HPD. An ANR earmuff, a passive earmuff, and a user-molded foam earplug were tested in two types of noises (pink and red) at two different noise levels (85 dBA and 100 dBA). The signal used was an …
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Psychophysical investigation of the real-ear attenuation of hearing protection devices under different sound-field diffusivity conditions
… and international consensus standards governing hearing protection device (HPD) attenuation testing specify the use of a diffuse sound field to ensure the sound field remains uniform and random-incidence in an envelope about the subject’s head (ANSI, 1974; ANSI, 1984; British BSI 5108:1983; …
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Effects of anechoic vs. reverberant sound-field, subject gender, and outlier dismissal on the real-ear attenuation of hearing protection devices
… environment on the measured attenuation of hearing protection devices (HPDs) when using a standard real-ear attenuation at threshold (REAT) protocol. In the experiment, three earmuffs and three earplugs were tested in two diffuse sound fields implemented in two different sound environments …
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Azimuthal Localization and Detection of Vehicular Backup Alarms Under Electronic and Non-Electronic Hearing Protection Devices in Noisy and Quiet Environments
Objective assessment for the effect of hearing protectors, background noise levels, and backup alarm acoustic features on listeners' abilities to localize backup alarm signals in the horizontal dimension, as well as on their ability to detect backup alarm signals in the distance dimension, is …
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Finite Element Modeling and Exploration of Double Hearing Protection Systems
… increasing, requiring the improvement of current hearing protection devices. The improvement of passive hearing protection devices lies in examining the performance of major contributors to reduction of noise attenuation. The finite element method can be used to fully explore single hearing …
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The effects of hearing protection on speech discrimination in differing noise spectra
… noise environments where workers utilize hearing protection devices (HPDs). A controlled empirical study was conducted to determine the effects of several independent variables on speech reception and discrimination including: l). subject's hearing configuration (unoccluded or earplug, …
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Active noise reduction headphone measurement: Comparison of physical and psychophysical protocols and effects of microphone placement
… (ANR) headphones cannot be tested and labeled as hearing protection devices (HPDs) due to inherent limitations with the existing psychophysical headphone testing standard, real-ear attenuation at threshold (REAT). This research focused on the use of a standard, for physical, microphone-in-real-ear …
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Spectral attenuation and wearability of circumaural hearing protectors as influenced by design attributes and work-related activity
Hearing protection devices (HPDs), a widely used countermeasure against noise-induced hearing loss, are laboratory-tested for their attenuation (noise reduction) capabilities. Unfortunately, laboratory tests overestimate the in-workplace performance of the devices, potentially leading to inadequate …
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Using signal detection theory to model the detection of warning signals in normal and hearing-impaired listeners while wearing hearing protection
… of whether or not an individual suffering from a hearing loss is capable of hearing an auditory alarm or warning is an extremely important industrial safety issue. International standard ISO 773 1—1986(E), Danger Signals for Work Places — Auditory Danger Signals, requires that any auditory alarm …
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An In-Field Experiment on the Effects of Hearing Protection/Enhancement Devices and Military Vehicle Noise on Auditory Localization of a Gunshot in Azimuth
Noise-induced hearing loss and tinnitus are the two most prevalent service-connected disabilities for veterans receiving compensation (Department of Veterans Affairs, 2010). While it is possible to protect against noise-induced hearing damage with hearing protection devices (HPDs) and hearing …
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Laboratory investigation of in-field influences on spectral noise attenuation and comfort of insert and circumaural hearing protectors
Laboratory-obtained, manufacturer-supplied hearing protector attenuation ratings typically overestimate the workers' protection level In the workplace. In addition, several work-related in-field factors often degrade protection performance of the hearing protection devices (HPDs), posing the threat …
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Development and Human Factors Evaluation of a Portable Auditory Localization Acclimation Training System
… are not immediately visible. Unfortunately, the Hearing Protection Devices (HPDs) required to operate in these environments can impede auditory localization performance. Promisingly, recent studies have exhibited the plasticity of the human auditory system by demonstrating that training can …
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Investigation of physical and psychophysical methods for the attenuation measurement of circumaural hearing protectors with implication for field use
… the attenuation workers are achieving with their hearing protectors in the field. Alternative measures for assessing a hearing protector's effectiveness were evaluated through comparison to the standardized real-ear attenuation at threshold (REAT) method, termed 1I3-REAT, a psychophysical …
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Field evaluation of noise attenuation and comfort performance of earplug, earmuff, and ear canal cap hearing protectors under the ANSI S12.6- 1984 sound field standard
… workplaces wearing 4 different industrial hearing protection devices (HPDs) while on the job. Over 2 consecutive 3-week periods of HPD use, the study investigated the effects of 2 different HPD fitting procedures (subject-fit versus trained-fit) on the spectral field attenuation and …
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Influence of insertion/donning instruction on frequency-specific sound attenuation achieved with ear canal caps and earmuffs with implications for industrial noise application
… instruction, and (5) modeled instruction. The hearing protection devices (HPDs) studied were: two earcaps (Willson #20 Sound-Ban, Flents #055 Peace & Quiet Headband), and four earmuffs (E-A-R model 1000, Siebe Norton Industrial model 4540, Peltor H6A/v, and Willson 365A Sound Barrier). HPD …
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Noise characterization and exposure at a ski resort
… continue to wear and maintain their current hearing protection devices. It is recommended that this ski resort continue the participation of all snowmaker employees in the current hearing conservation program. Further research is also recommended in order to determine if chair lift operator …
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Hearing protection in mines : evaluating the Noise Clipper® custom made hearing protection device
Noise induced hearing loss has been extensively researched and commented on, yet it remains prevalent among industrial workers. The real-world attenuation properties of the Noise Clipper® custom-made hearing protection device and the comfort levels it afford are unknown. Furthermore, research in …
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Effects of Earplug Material, Insertion Depth, and Measurement Technique on Hearing Occlusion Effect
… sound when the ear canal is occluded with hearing protection devices, hearing aids, or other canal-sealing inserts. Since the occlusion effect will enhance the hearing of bodily- generated sounds and result in distorted perception of one's own voice, many people report annoyance with …