A1 Refereed original research article in a scientific journal
Optimized reference spectrum for rating the facade sound insulation
Authors: Virjonen Petra, Hongisto Valtteri, Mäkelä Marko M, Pahikkala Tapio
Publisher: ACOUSTICAL SOC AMER AMER INST PHYSICS
Publication year: 2020
Journal: Journal of the Acoustical Society of America
Journal name in source: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Journal acronym: J ACOUST SOC AM
Volume: 148
Issue: 5
First page : 3107
Last page: 3116
Number of pages: 10
ISSN: 0001-4966
eISSN: 0001-4966
DOI: https://doi.org/10.1121/10.0002452
Web address : https://asa.scitation.org/doi/10.1121/10.0002452
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/51032393
Objectively determined single-number-quantities (SNQs) describing the airborne sound insulation of a facade should correspond to the subjective perception of annoyance to road traffic sounds transmitted through a facade. The reference spectra for spectrum adaptation terms C and Ctr in standard ISO 717-7 (International Organization for Standardization, 2013) are not based on psycho-acoustic evidence. The aim of this study is to develop reference spectra which result in SNQs that explain the subjective annoyance of road traffic sounds transmitted through a facade well. Data from a psycho-acoustic experiment by Hongisto, Oliva, and Rekola [J. Acoust. Soc. Am. 144(2), 1100-1112 (2018)] were used. The data included annoyance ratings for road traffic sounds (five different spectrum alternatives) attenuated by the facade (twelve different sound insulation spectrum alternatives), rated by 43 participants. The reference spectrum for each road traffic spectrum was found using mathematical optimization. The performance of the acquired SNQs was estimated with nested cross-validation. The SNQs determined with the optimized reference spectra performed better than the existing SNQs for two road traffic spectra out of five and for an aggregate of the five road traffic sound types. The results can be exploited in the development of standardized SNQs.
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