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Uncertainty of in situ low frequency reverberation time measurements from 20 Hz – An empirical study; Part II: Impulse response method
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0002-8451-4804
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics. Simmons Akustik och Utveckling, 41288 Gothenburg, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
2022 (English)In: Noise Control Engineering Journal, ISSN 0736-2501, E-ISSN 2168-8710, Vol. 70, no 3, p. 298-308Article in journal (Refereed) Published
Abstract [en]

An important part of evaluating impact sound insulation is to measure the reverberation time in the receiving room. The increasing trend of using wooden structures for residential buildings has made it increasingly important to have control of the measurement procedure at low frequencies. The present ISO standards do not give any specific guidelines for how to deal with frequencies below 50 Hz. It cannot be taken for granted that the present guidelines developed for higher frequencies are also appropriate for lower frequencies. This paper includes an empirical study of the spatial variation of reverberation time, measured from 20 Hz in two different rooms, with about 100 microphone positions in each room. The results from two alternative methods are compared, based upon the impulse response and the interrupted noise respectively. The accuracy of an intended normal measurement procedure is estimated with respect to the number of microphone positions.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering , 2022. Vol. 70, no 3, p. 298-308
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-92516DOI: 10.3397/1/377024ISI: 000810206700007Scopus ID: 2-s2.0-85132897345OAI: oai:DiVA.org:ltu-92516DiVA, id: diva2:1687969
Funder
Swedish Research Council Formas
Note

Validerad;2022;Nivå 2;2022-11-18 (hanlid)

Available from: 2022-08-17 Created: 2022-08-17 Last updated: 2022-11-30Bibliographically approved

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Ljunggren, FredrikPettersson, Maria

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