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- W2437432 abstract "According to several independent field surveys, noise is the most adverse factor of indoor environment in open offices. Speech has been rated as the most distracting sound source. Laboratory experiments have shown that speech impairs the performance of cognitively demanding tasks, e.g. verbal and memory recall tasks. Speech intelligibility determines the distracting power of speech primarily, not the sound pressure level of speech. These results should be translated into common language to promote the importance of noise control in open offices. The aim of this study is to suggest a new model that predicts the decrease in work performance as a function of Speech Transmission Index, STI. Subjective speech intelligibility can be evaluated by measuring the STI between office workstations. Work performance is best when speech is absent (STI=0.00), and worst when speech is perfectly understood (STI=1.00). The shape of the performance loss versus STI between 0.00 and 1.00 was based on previously known relation of subjective speech intelligibility and STI. The performance loss starts to increase strongly when STI exceeds 0.20. The increase ceases when STI exceeds 0.60. The model was validated using recent experimental data. Although the model ignores, e.g., task demands, habituation, aural effects and loudness of speech, it seems to work as a link between environmental psychology and acoustic design. It can be used directly to promote noise control since the payback time of investments can be estimated by means of improved work performance." @default.
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- W2437432 date "2008-01-01" @default.
- W2437432 modified "2023-09-27" @default.
- W2437432 title "Task performance and speech intelligibility - a model to promote noise control actions in open offices" @default.
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