Anne Heimes: Filter Design for Sound Insulation Auralization

17. August 2018 | von
2019-08-09 um 11:00 – 12:00
Institut für Technische Akustik
Kopernikusstraße 5
52074 Aachen

As a valuable tool, building acoustic auralization is used to assess the perceptual aspects of sound transmission in built-up environments in order to provide the guidelines for building construction and to evaluate the noise effects on humans that have a negative influence on their working performances at working sites. These noise disturbances are present within the built environments and/or might be from outdoor moving transient sound sources. An extensive research is carried out to estimate the sound propagation and transmission in the buildings. Methods are available for auralization of sound insulation between connected rooms in compliance with the standardized data formats of sound insulation and building structural geometries. However, there still exist certain challenges to be addressed to construct the transfer functions between source and receiver rooms for indoor situation as well as for outdoor moving sources.

Several simplifications exist in available building acoustic auralization research. Some simplifications are implicit in the formulation on which the ISO standards are based. In first place, the incident sound pressure on the boundaries of the building elements (i.e. walls) is equal for all transmission paths between source and the receiver. Similarly, the same incident sound power hits all elements, independently of the source position and room geometry. Additionally, influence of the source room reverberation, the directionality of the sound source, and the ratio between direct and reverberant energy inside the source room are integral part of building acoustic transfer functions, which are rarely addressed. Secondly, the transfer functions calculated from source room to receiver room are only valid for point to point transmission, however, the extended walls are always present in real situations. In the receiving room, the simplification is made that the sound is apparently radiated from one point representing the whole bending wave pattern on the wall, as a result one whole wall is represented by a single point source radiator.

This research focuses on addressing these challenges for plausible representation of building acoustics auralization. The building elements are considered as plane sources and bending wave patterns are addressed in order to be able to properly construct the transfer functions. The room acoustical simulations are carried out for both source and receiving rooms to generate transfer functions from source to the source room walls and from radiating receiving room walls to the listener, so that the geometries and absorptions might be fit to the properties desired by the user for the spatial impression of the listening rooms. In addition, the transfer functions from radiating walls of the receiving room to listener are designed in such a way that not only indoor sources are handled nevertheless the outdoor moving sources are also addressed. In this way a physically more plausible building acoustic auralization framework is proposed, by dint of that different psychoacoustic experiments are possible in virtual reality for evaluation of noise and comfort in built-up structures and psychological research about the work performance of people at office sites under undesirable noise conditions can be carried out in an ecologically correct way.

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