This paper discusses a computer modeling and an auralization system for evaluating how the acoustical properties of a space relating to speech intelligibility. This system employs a method based on geometrical acoustics. In this simulation method it is assumed that sound is composed of three components: the direct information, reflections computed by the mirror image method (M.I.M), and the remaining reverberation. The practical way to precisely reproduce the three components is discussed in this paper. One of the keys to viable sound field simulation is the ability to reproduce precisely the direct sound in terms of those qualities often recognized only subjectively. Another key element in simulation is the accurate reproduction of the direct-to-reverberant ratio and the arrival direction and frequency characteristics of the reverberant information. To verify the accuracy of the reproduced sound field, we checked the reproducibility of a room response and known acoustic indexes: the STI, RASTI and the 3-syllable articulation scores. Throughout the comparison between the site and the simulator, a STI value can be predicted within an error of 0.07; RASTI can be predicted to within 0.1. Three-syllable articulation scores can be predicted within an error of 10 percent. The simulator performs with sufficient accuracy to predict these parameters reliably.
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