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  • Determination of the position of equipment noise sources in educational institutions according to subjectively evaluated speech intelligibility [Elektronski vir]
    Dovjak, Mateja ; Pirnat, Denis ; Prislan, Rok
    Building-equipment noise is the primary source of background noise in buildings. It is a key factor influencing speech intelligibility, along with room acoustics, sound insulation of the building ... envelope and the noise level in the room. The impact of building-equipment noise on the acoustic environment in educational institutions is poorly addressed in current design practice; attention is focused only on the requirements for maximum background noise levels and not on the position of noise sources in the room. Our study focuses on a characteristic lecture hall of an educational institution where an artificial speaker was used to simulate the speaker, while the noise typically produced by an HVAC system was generated by an omnidirectional loudspeaker. The position and level of the generated noise were varied for two listening/microphone positions. Under these conditions, (i) the Speech Transmission Index (STI), which objectively determines speech intelligibility, was measured, (ii) listening tests were performed to assess intelligibility of digits, and (iii) subjective assessment of intelligibility was performed using questionnaires. On this basis, recommendations for speech intelligibility in lecture halls and classrooms were developed in terms of equipment position and background noise level. The results show that although the position of the noise source has no significant influence on the STI, it can influence the perceived intelligibility. As such, background noise is not a sufficient criterion for including noise sources in the built environment, and the position of noise sources can be optimised in the design phase. This research was approved by the Ethics Committee for Research Involving Human Subjects, University of Ljubljana (012-2021; Ljubljana, 18 February 2022).
    Vir: 10th Congress of the Alps Adria Acoustics Association [Elektronski vir] : international scientific congress : 20.-21. September 2023, Izola, Slovenia : AAAA 2023 Izola : book of peer-reviewed papers (Str. 61-66)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2023
    Jezik - angleški
    COBISS.SI-ID - 179159811

    Povezava(-e):

    https://www.alpsadriaacoustics.eu/wp-content/uploads/2023/11/Proceedings_ver3.pdf

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