TCDP - protected
The project of Fotis Georgiou
The impact of noise control measures can be expressed by a reduction of the equivalent noise levels LAeq or Lden. However, the urban noise sources are transient and the urban sound environment cannot be assessed by equivalent sound levels only. Temporal effects have been studied indicated by reverberation time, or by perceptual evaluations utilizing auralizations. Auralization is a technique used to play back the acoustic environment with the presence of sound sources, for example with the use of only two audio channels.
Urban noise could partly be masked by positively perceived sounds, advocating for the importance of auralization. Furthermore, auralization of traffic situations could be very helpful in the communication of the noise situation with the public as well as with decision makers. For example, the effect of a proposed noise control measure can be made audible from auralization, which enables evaluation of the measure for the specific environment. Finally, auralization is helpful as a design tool of the urban environment, and supports the concept of soundscaping (i.e. designing the urban sound environment given all sounds present). Existing auralization studies in urban areas rely on simplified prediction methods that are sufficient for rural situations without too many reflections with vertical planes. In inner city environments however, with multiple (specular and diffuse) reflections from faŤades, a more sophisticated auralization method is highly needed.
The overall objective of this project is to establish a hybrid acoustic modeling technique that enables to realistically auralize inner city environments. To reach this aim, the project can be split into various objectives:
- The development of a wave-based method for auralization in inner city environments including moving sources and Head Related Impulse Responses (HRIRs);
- The development of a hybrid computational auralization methodology for auralization in inner city environments;
- Evaluation of the appropriateness of the proposed auralization methodology by auralizing inner city environments based on the computations as well as on measurements.