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Does it matter whether single-number values of sound reduction indices are evaluated from third-octave band values or from octave band values?

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At present, sound insulation characteristics of buildings or building elements are described both in terms of octave band and third-octave band spectra. From these, so-called single-number quantities are derived as a means of simple evaluation of the spectra. On the occasion of the revision of ISO 717 - where the procedures of single-numbering are described - the question arose whether to keep both frequency resolutions, and, if yes, how to make them compatible. In this paper, the exact transition from third-octave band insulation values to the corresponding octave band values is investigated and compared with the practical measurement situation. Furthermore, the scatter of the resulting single-numbers caused by the specification of reference curves in terms of octave and third-octave band values, respectively, is demonstrated. Finally, a proposal from a new measurement standard is presented which could solve the problems of the two competing rating systems.
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Document Type: Research Article

Publication date: March 1, 2012

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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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