What are the characteristics of a good sound? Why are some noises annoying, while others indicate that a product is functioning reliably? Can a vacuum cleaner sound powerful even though it is quiet? Psychoacoustics sets out to provide answers to these questions. For this purpose, research is conducted into the physical factors that influence the subjective perceived sound quality. In order to describe and predict the quality of sounds, the Fraunhofer research scientists work in close cooperation with the scientists conducting fundamental research at the Carl von Ossietzsky University of Oldenburg to develop computer models that simulate the hearing perception of normal and impaired hearing. The scientists develop application-specific evaluation measurements for sound parameters such as loudness, speech intelligibility, roughness or annoyance.