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Revision of ISO 717: Why Not Use Impact Sound Reduction Indices Instead of Impact sound Pressure Levels? Part 2: Application to Different Impact Sources

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The standard series ISO 717 “Acoustics – Rating of sound insulation in buildings and of building elements” establish rules, how to evaluate one single characteristic number (so-called 'single-number quantities') for sound insulation from corresponding frequency spectra in third-octave or octave bands. At present, airborne sound insulation is expressed in terms of sound reduction indices, i.e. as ratios of incoming to transmitted sound power for a particular building element or situation, whereas impact sound is expressed in terms of sound pressure levels, based strictly on standard tapping machine excitation, which makes it - among other drawbacks - difficult to draw conclusions for other, more wide-spread impact sources. In the preceding paper [1], it was proposed to use sound reduction indices for impact noise, too. Hence, several questions arise: What would the "incoming sound power" be in this case? Is it necessary to have a separate impact sound reduction index for each kind of impact source? Could they be converted into each other by simple 'correction terms'? How shall corresponding single-number quantities be defined? Answers are given in the present paper and discussed in more detail by means of the cases of the ISO standard tapping machine and walking persons. In any case, impact sound reduction conversion calculations from one source to another should take the source and receiver mobilities into account, or they may lead to wrong results.
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Document Type: Research Article

Publication date: November 1, 2013

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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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