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Comments on “Subjective and Objective Rating of Airborne Sound Insulation – Living Sounds [Acta Acustica united with Acustica 100 (2014) 848–863]”

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In the paper [1], the researchers working with the revision of the single number quantities (SNQs) for sound insulation in the present ISO standard 717 claim that the applied SNQs must be based on scientific evidence. They also express disappointment in the poor adequacy of the literature concerning SNQs. The aim of the comments is to refer to and review some papers which the researchers have not taken into account in their work. The two basic SNQs are the reference curve method and the sound pressure level difference method. Some known properties of the methods are reviewed, but also some new ideas are presented. The sound pressure level difference method does not necessarily work well due to an overly strong spectral dependence. On the other hand, the reference curve method seems to be better, being based more on the arithmetic mean of the sound reduction indices. The requirement concerning the arithmetic mean is a consequence of loudness. Finally, the comments imply that the reference curve method is worth preserving.
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Document Type: Letter Section

Publication date: 01 May 2015

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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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