Artificial Head (ATF) for Evaluation of Hearing Protectors
Abstract:In order to measure the Insertion Loss (IL) of hearing protectors in high levels of steady-state or impulse noise, the acoustic isolation of an Acoustical Test Fixture (ATF) has to exceed the Insertion Loss of the hearing protectors. As the acoustic isolation of commercially available artificial heads does not meet this requirement, a new device has been designed and built. The artificial head, made of hard polyurethane, is designed to fit the Head Acoustics® external ear and circumaural region. An ear simulator from Brüel & Kjær is used to simulate the acoustic impedance of the human ear. The isolation of this ATF is better than 70 dB in a large frequency range (even when exposed to shock waves). The transfer function of the open ear is in close agreement with the experimental data published by Shaw and is linear up to 190 dB (peak pressure). This ATF allows the evaluation of all kinds of hearing protectors from the lowest to the highest (190 dB) levels.
Document Type: Research Article
Publication date: September 1, 2000
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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