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- W2027691292 abstract "Speech intelligibility metrics that take into account sound reflections in the room and the background noise have been compared, assuming diffuse sound field. Under this assumption, sound decays exponentially with a decay constant inversely proportional to reverberation time. Analytical formulas were obtained for each speech intelligibility metric providing a common basis for comparison. These formulas were applied to three sizes of rectangular classrooms. The sound source was the human voice without amplification, and background noise was taken into account by a noise-to-signal ratio. Correlations between the metrics and speech intelligibility are presented and applied to the classrooms under study. Relationships between some speech intelligibility metrics were also established. For each noise-to-signal ratio, the value of each speech intelligibility metric is maximized for a specific reverberation time. For quiet classrooms, the reverberation time that maximizes these speech intelligibility metrics is between 0.1 and 0.3 s. Speech intelligibility of 100% is possible with reverberation times up to 0.4-0.5 s and this is the recommended range. The study suggests ideal and acceptable maximum background-noise level for classrooms of 25 and 20 dB, respectively, below the voice level at 1 m in front of the talker." @default.
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- W2027691292 title "Reverberation time and maximum background-noise level for classrooms from a comparative study of speech intelligibility metrics" @default.
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- W2027691292 doi "https://doi.org/10.1121/1.428268" @default.
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