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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260507T130000
DTEND;TZID=Europe/Berlin:20260507T140000
DTSTAMP:20260504T213016
CREATED:20260504T163530Z
LAST-MODIFIED:20260504T164403Z
UID:3967-1778158800-1778162400@blog.rwth-aachen.de
SUMMARY:Robert Schmitt: Filters for Sound Propagation over Discontinuous Surfaces
DESCRIPTION:Traffic noise in urban environments constitutes a significant health hazard\, creating potential for proactive noise management and auralization as tool for modern urban planning. However\, state-of-the-art raybased Geometrical Acoustics (GA) models utilized in current auralization pipelines struggle to predict the sound propagation across grounds featuring varying acoustic properties\, known as Impedance Discontinuity (ID). Relying just on Specular Reflection (SR) leads to unphysical\, abrupt spectral changes when a geometric reflection point moves across an ID. To resolve such discontinuities\, this thesis proposes extensions to the reflection and diffraction propagation simulation of sound propagation based on GA. First\, the reflection filter is extended to incorporate the Weyl-Van der Pol approximation\, accounting for spherical wavefront curvature over finite impedances. Second\, the M-UTD is introduced. The M-UTD treats an ID as a diffractive edge by adapting electromagnetic diffraction models incorporating extensions by Luebbers\, Holm\, and Schettino to acoustic propagation. The M-UTD is evaluated against Boundary Element Method (BEM) simulations and experimental measurements. These investigations cover single and multiple IDs scenarios on flat surfaces\, angled wedges\, and a dynamic auralization scenario. The results demonstrate that the M-UTD successfully compensates for the magnitude and phase differences at material boundaries. By computing a continuous diffraction component driven by the impedance mismatch\, the model reduces discrete amplitude fluctuations during dynamic source movement\, yielding a much smoother and more physically plausible time-variant spectrogram. While limitations remain at low frequencies and grazing angles\, the proposed M-UTD provides an efficient\, reciprocal\, and robust solution. Ultimately\, it improves the agreement of the calculated sound field over discontinuous surfaces with BEM simulations and measurements. \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: 643 7384 8607\nPasswort: 2020000
URL:https://blog.rwth-aachen.de/akustik/event/robert-schmitt-filters-for-sound-propagation-over-discontinuous-surfaces/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Masterarbeit
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260508T110000
DTEND;TZID=Europe/Berlin:20260508T120000
DTSTAMP:20260504T213016
CREATED:20260411T153128Z
LAST-MODIFIED:20260414T092700Z
UID:3950-1778238000-1778241600@blog.rwth-aachen.de
SUMMARY:Carolin Breuer: Evaluating Auditory Selective Attention in Classroom Scenarios using Audiovisual Virtual Reality - From Auditory to Audiovisual Scenarios
DESCRIPTION:How do we focus on one sound source while ignoring distractions in a noisy environment? This thesis investigates auditory selective attention in a virtual reality classroom\, using immersive technology to study listening behavior in settings that resemble everyday life more closely than traditional approaches. \nAn established audio-only attention task was transferred into a VR classroom scenario\, where participants responded to sounds coming from different spatial positions. Initial results showed more accurate responses in VR\, suggesting that immersive environments may increase engagement and motivation. \nFurther studies examined how visual context\, realistic classroom noise\, and room acoustics influence auditory attention. While audio-visual congruence showed no consistent benefits\, complex background noise and intelligible speech clearly reduced performance and increased listening effort. Simulated reverberation also affected performance. \nTogether\, the findings show that realistic listening behavior cannot be fully captured with traditional unisensory paradigms alone. Instead\, more plausible approaches are needed to understand how auditory attention operates in real classrooms\, workplaces\, and other everyday environments. \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: 643 7384 8607\nPasswort: 2020000
URL:https://blog.rwth-aachen.de/akustik/event/carolin-breuer-evaluating-auditory-selective-attention-in-classroom-scenarios-using-audiovisual-virtual-reality-from-auditory-to-audiovisual-scenarios/
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:20260522T110000
DTEND;TZID=Europe/Berlin:20260522T120000
DTSTAMP:20260504T213016
CREATED:20260504T164102Z
LAST-MODIFIED:20260504T164102Z
UID:3969-1779447600-1779451200@blog.rwth-aachen.de
SUMMARY:Hyeju Park: Influence of Small-Scale Objects on Outdoor Sound Propagation
DESCRIPTION:Traffic noise is an important public health issue and factor of annoyance. Auralization enables its perceptual evaluation in virtual environments. In outdoor sound propagation simulations\, however\, geometric modeling often focuses on large-scale features\, while smaller roadside structures are neglected or simplified. For vehicle noise sources located close to the ground\, roadside structures of similar height can modify the sound field and become perceptually relevant. Nevertheless\, it remains unclear whether these effects lead to perceivable changes in auralization. To address this question\, this study investigates sidewalks as an example of small-scale roadside structures. A Boundary Element Method (BEM) model based on a 2D reduction is developed and validated against measurements. The model is then used to compare flat and different sidewalk geometries\, including curb shapes and street cross-sections with complex surface impedance. The results are analyzed using frequency responses and psychoacoustic parameters loudness and sharpness. Finally\, to evaluate the potential for future use\, a Geometrical Acoustics (GA)-based model is compared with the BEM results. The results show that sidewalk geometry modifies the sound field by altering reflection paths\, introducing edge diffraction\, and changing interference patterns\, with effects depending on the source–receiver configuration. Curb shape has an additional but secondary influence\, while surface impedance and material transitions further affect reflected and diffracted components. Psychoacoustic analysis indicates that these acoustic differences may influence loudness and sharpness\, suggesting that small-scale roadside structures such as sidewalks should not be regarded as acoustically negligible for perceptually meaningful outdoor auralization. The GA-based model shows good agreement for some configurations but also limitations for soft ground surfaces and impedance discontinuities. \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: 643 7384 8607\nPasswort: 2020000
URL:https://blog.rwth-aachen.de/akustik/event/hyeju-park-influence-of-small-scale-objects-on-outdoor-sound-propagation/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Masterarbeit
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