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DTSTART;TZID=Europe/Berlin:20241105T103000
DTEND;TZID=Europe/Berlin:20241105T113000
DTSTAMP:20260504T043815
CREATED:20241015T102508Z
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UID:3176-1730802600-1730806200@blog.rwth-aachen.de
SUMMARY:Schäfer: Real-time auralization of aircraft noise considering curved sound propagation
DESCRIPTION:Aircraft are one of the major noise sources affecting residents close to airports. Classical metrics for noise assessment are usually derived from energy-based quantities\, such as known from noise maps. Thus\, they only consider human perception in a very basic manner. To investigate the impact of aircraft noise in a more accurate way\, it is desired to conduct experiments focusing on human perception by presenting audible signals. This can be achieved in virtual acoustic environments. In this context\, auralization is an approach to synthesize these audio signals based on virtual scenarios. \nOne important requirement for auralization is a model for sound propagation from the aircraft to the listener. Typical aircraft auralization approaches use the simplification of a homogeneous medium and a flat ground. However\, the atmosphere is generally inhomogeneous and moving leading to sound propagating along curved paths. Furthermore\, sound generally interacts with urban structures within residential areas\, e.g. leading to reflections and diffraction or occlusion of the direct sound. \nThis work aims to overcome these simplifications in order to allow the consideration of aircraft noise in more realistic acoustic virtual environments. For this purpose\, an aircraft auralization approach considering curved sound propagation in the atmosphere is proposed. This includes a computationally efficient method to simulate the curved sound paths connecting a source and a receiver\, while still assuming a flat ground. It is based on a ray tracing algorithm for inhomogeneous\, moving media and uses a divide-and-conquer routine to significantly reduce the number of calculated rays. Furthermore\, a procedure for scheduling these simulations and interpolating respective results is presented\, which enables to perform such auralizations in real time. \nFinally\, an interface method is introduced allowing to combine the presented curved propagation approach with urban auralization methods. Such methods consider the interaction with urban structures but assume straight-path propagation. The proposed interface finds a virtual source position for the urban auralization in order to maintain the acoustic properties resulting from the curved propagation through the atmosphere\, e.g. incident direction at the receiver and propagation delay. The method was applied to a street canyon scenario. The auralization result highlights the relevance of considering sound interaction with urban structures. This is especially prominent when the direct sound is occluded and therefore\, reflected and diffracted sound paths have a significant effect on the localization of the aircraft. \nMelden Sie sich hier an um Einladungen zu den Kolloquium-Vorträgen per E-Mail zu erhalten.\nRegister here to receive the invitations to colloquium talks via e-mail. \nZoom-Meeting-ID: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/schaefer-real-time-auralization-of-aircraft-noise-considering-curved-sound-propagation/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Dissertation
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241105T113000
DTEND;TZID=Europe/Berlin:20241105T123000
DTSTAMP:20260504T043815
CREATED:20241015T102701Z
LAST-MODIFIED:20241015T102701Z
UID:3178-1730806200-1730809800@blog.rwth-aachen.de
SUMMARY:Kohnen: Combining Reproduction Techniques for Room Auralizations
DESCRIPTION:Spatial auditory information allows humans to separate sources from each other. Furthermore\, source localisation can steer the focus towards events that are not in sight. 3D sound is hence an important feature of human hearing. To investigate the particular effects of sound perception\, a controlled reproduction of spatial sound is needed in order to recreate an acoustic scene as accurately as possible. In contrast to headphone-based reproduction\, spatial sound presentation via loudspeakers lowers the inhibition threshold as no device has to be attached to the listener. It also increases immersion into the scene as well as allowing communication between listeners or with a supervisor. The virtual acoustic scenes are typically simulated by auralization. The basis are computer simulations of room impulse responses (RIR)\, which can physically and perceptually be divided into different time sections: direct sound\, early reflections and diffuse decay. Furthermore\, different\, loudspeaker-based reproduction methods exist with individual strengths and weaknesses. Preceding investigations hint\, that for the perceptually relevant qualities of each time section one reproduction method is optimal\, while the shortcomings of this reproduction method only applies for qualities that are relevant in another time section of the RIR. \nThe goal of the thesis is to implement a system that combines different reproduction methods to optimise the sound reproduction of virtual rooms. The user should furthermore be integrated into the system and the virtual room\, i.e. speaking should result in a room dependent perception of reverberation. Additionally\, the influence of the room the loudspeakers are placed in (listening room) should be compensated to avoid the requirement of an anechoic chamber for reproduction. \nThe creation of such a system is based on various steps. The individual systems have to be implemented and combined with the room acoustical simulation. The techniques implemented are binaural crosstalk cancellation (CTC)\, 2nd Order Ambisonics and Vector-Base Amplitude Panning (VBAP) due to their ability to provide full\, three-dimensional source positioning. They are tested against each other in various perceptual qualities including localisation accuracy. To keep the original structure of the RIR\, and ensure a correct transition between the reproduction techniques\, their loudness has to be calibrated against a reference condition. To compensate the room\, prior knowledge of the virtual room and the listening room is used. The virtual room is changed until the combination of virtual room and listening room complies with the unchanged virtual room. \nBased on the findings\, a suitable reproduction technique is selected for each section of the RIR. The final system is then again tested to verify that improvements in different perceptual qualities are audible and identify any trade-offs. The user integration\, speaking into a virtual room\, is evaluated. \nMelden Sie sich hier an um Einladungen zu den Kolloquium-Vorträgen per E-Mail zu erhalten.\nRegister here to receive the invitations to colloquium talks via e-mail. \nZoom-Meeting-ID: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/kohnen-combining-reproduction-techniques-for-room-auralizations/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Dissertation
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