Hearing is an important sense in our daily life and enables us to interact with our environment, objects and other persons. The sound signals deliver us several information. Therefore, hearing and vehicle sounds play an important role for the traffic safety. The timely detection of the vehicles by pedestrians is a prerequisite. However, electric vehicles move almost silently up to a speed of 20 km/h. In order to reduce this risk for all traffic participants including especially children, visually impaired and elderly persons, and cyclists, quiet vehicles should emit artificially generated sounds. For this purpose, standards have already been defined by various national and international authorities with regard to the sound character. The regulation of United Nations Economic Commission for Europe (UN Regulation No. 138 - ECE/TRANS/WP.29/2016/26) and US, Federal Motor Vehicle Safety Standard (FMVSS) 141 are two of the most prominent.