Nentwich F.

This treatise addresses the simulation of the interior sound of a car. The car's sound is the sum of numerous sound components which originate from different sources that employ various transfer paths to reach the passenger cabin. The sound components are synthesized one at a time in the time domain. By assembling them, the simulation of the car's overall sound is obtained. The simulation is presented via headphones and judged subjectively. This makes a gauge of the sound components' influence on the car's overall sound possible. In addition, a new method to synchronise serial measurements of the engine's sound components is developed. The method preserves the relative phase enabling the superposition of serial measurements without phase artefacts. To demonstrate how a physical modification of the car's structure would affect the subjective perception of the car's sound, stiffer engine mountings and a thinner windscreen are used as examples. To validate the simulation, the car's run up sound is recorded and compared with the simulation in a physical as well as psychoacoustic manner.