Abstract
A novel method for evaluating in-vehicle speech intelligibility is proposed using the speech intelligibility index (SII) based on measured speech signal, evaluated at the sentence speech reception threshold (sSRT) in a simulated driving environment. The statistical variability was quantified by considering the hearing ability of normal hearing individuals and the influence of multi-sensory perception on the in-vehicle speech intelligibility. The sSRT values were obtained from the hearing in noise test (HINT) using a jury of 30 participants in a driving simulation created by Samardzic et al. (2012). Different configurations of the talker and the listener and vehicle operating conditions were also considered. The SII values evaluated at the sSRT and the associated statistical variability presented in this study provide a benchmark for future evaluation of in-vehicle speech intelligibility.
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