The speech transmission index, the useful-to-detrimental ratio, and the percent articulation loss of consonants are three quite different types of measures of speech intelligibility in rooms. They each combine a measure of the speech-to-noise ratio and a measure of the room acoustics to better relate to speech intelligibility in rooms. Values of all three types of measures were calculated from 91 room impulse responses obtained from a wide range of acoustical conditions, and for different speech-to-noise ratios. Several forms of these measures are shown to be reasonably well related to each other. The calculated regression equations relating the various measures of speech intelligibility permit practical conversions among the measures.
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