This optional extension BASTIAN auralization renders the calculated sound insulation audible for various indoor and outdoor sound sources in dependence of the sound absorption characteristics of the receiving room. The term "auralization" origins from the Latin word "auris" (the ear) and characterizes the process of rendering audible acoustical simulations. The aims of auralization in building acoustics are:

• Realistic reproduction
• Signal identification
• (relative) Judgement of different building situations
• Supplementary information to insulation spectra and single number ratings

The transmission is modeled by a filter which is specific for the kind of transmission and direction. The reverberation is generated from measured impulse responses in real rooms. By convoluting the selected input signal with the impulse response the time signal in the receiving room is obtained. The resulting signal comprises of the source characteristic, the transfer function room-walls-room, and the receiving room characteristics (reverberation).