Abstract
Speech intelligibility in classrooms is determined by both speech/noise ratios and room acoustics factors. Using a rhyme test, speech intelligibility scores were obtained in sound fields simulated using an electroacoustic system in an anechoic room. The 16 sound fields consisted of the combinations of four levels of speech/noise ratio and four levels of a room acoustics measure giving an even distribution over all conditions likely to occur in realistic situations. The results were used to test the validity of acoustical measures that reflect the combined influence of speech/noise and room acoustics factors such as the speech transmission index, the Alcons measure, and useful/detrimental sound ratios. They were also used to investigate improved acoustical measures for speech in rooms and to evaluate the importance of speech/noise ratios relative to room acoustics factors.
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