Accuracy of speech transmission index predictions based on the reverberation time and signal-to-noise ratio |
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| Institution: | 1. Department of Building, Energy, and Environmental Engineering, University of Gävle, SE-80176 Gävle, Sweden;2. Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden;3. Linnaeus Centre HEAD, Swedish Institute for Disability Research, Linköping University, Linköping, Sweden;1. Finnish Institute of Occupational Health, Tampere, Finland;2. Sirate Group Ltd, Tampere, Finland;3. Akukon Ltd, Oulu, Finland;4. University Properties of Finland Ltd, Tampere, Finland;5. Aalto University, Helsinki, Finland;6. Tampere University of Technology, Finland;1. Finnish Institute of Occupational Health, Turku, Finland;2. Turku University of Applied Sciences, Turku, Finland;1. Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;2. School of Architecture, Huaqiao University, Xiamen 361021, PR China;3. Xiamen Key Laboratory of Ecological Building Construction, Xiamen 361021, PR China;4. State Key Laboratory of Subtropical Architecture Science, South China University of Technology, Guangzhou 510640, PR China |
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| Abstract: | This paper examines the accuracy of the speech transmission index (STI) calculated from the reverberation time (T) and signal-to-noise ratio (LSN) of enclosed spaces. Differences between measured and predicted STIs have been analysed in two rooms (reverberant vs. absorbent), for a wide range of absorption conditions and signal-to-noise ratios (sixteen tests). The STI was measured using maximum length sequence analysis and predictions were calculated using either measured or predicted values of T and LSN, the latter assuming diffuse sound field conditions. The results obtained for all the conditions tested showed that STI predictions based on T and LSN tend to underestimate the STI, with differences between measured and predicted STIs always lower than 0.1 (on a 0.0–1.0 scale), and on average lower than 0.06. According to previous research, these differences are noticeable and therefore non-negligible, as 0.03 is the just noticeable difference in STI. The use of either measured or predicted values of T and LSN provided similar STI predictions (i.e. non-noticeable changes), with differences between predictions that are on average lower than 0.03 for the absorbent room, and lower than 0.01 for the reverberant room. |
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| Keywords: | Acoustic measurements Room acoustics Speech intelligibility Sound quality |
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