The sound reduction index is calculated on the basis of frequency-dependent measurement results. A standardized reference curve is used to determine a single-number value Rw for classification into sound insulation classes. The extent to which the subjectively perceived frequency-dependent sound insulation of the window is suitable for achieving the best possible sound insulation in the on-site noise situation can only be determined to a limited extent on the basis of the single-number value.
The aim of the project is thus to make the sound reduction index audible as a criterion for personal selection and product development before new windows are installed. Finally, the potential of this method is demonstrated by implementing a prototype in the form of a digital tool. This allows people even without acoustics skills to subjectively evaluate the sound insulation.