In order to optimize in-cax communication and infotainment applications in vehicles, intelligibility measurements in selected conditions could be used to predict speech intelligibility for occupants. Intelligibility is one important factor for communication quality [6, 3] and can be measured reliably. However measurements of intelligibility with subjects are time consuming and expensive, what makes the use of Speech Indices attractive. Their application is well known in typical communication situations with concurrent speech noise but in-car acoustics is special. Therefore, the scope of application has to give proof in this situation.
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