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A Nordic Round Robin Test on Hearing Protectors. The Influence of the Sound Field on Measured REAT Attenuation

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The international standard ISO 4869-1 describes a method for the measurement of the attenuation of hearing protectors by means of the 'real ear attenuation at threshold' method, REAT. The measurements are performed in an approximated diffuse sound field using one-third octave noise bands. In order to gain information about the possible influence of the sound field characteristics on the measured attenuation values an inter-laboratory test was performed among Nordic test laboratories with different sound field realizations. The results show that some of the common sound field realizations do not fulfil the diffusivity requirements when measured with a highly directional microphone. No systematic relation was found between the sound field variation and variation in the measured attenuation values.
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Document Type: Research Article

Publication date: September 1, 2004

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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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