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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260507T130000
DTEND;TZID=Europe/Berlin:20260507T140000
DTSTAMP:20260723T170301
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:20260723T170301
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:20260723T170301
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260529T110000
DTEND;TZID=Europe/Berlin:20260529T113000
DTSTAMP:20260723T170301
CREATED:20260518T120011Z
LAST-MODIFIED:20260518T120408Z
UID:3987-1780052400-1780054200@blog.rwth-aachen.de
SUMMARY:Aks Arora: Modelling the optoacoustic stimulation of the eardrum
DESCRIPTION:Optoacoustic stimulation is an umbrella term describing the generation of mechanical vibrations through optical irradiation and has recently attracted attention as a potential principle for light-driven hearing-aid systems. One specific mechanism underlying this effect is thermoelastic bending\, referred to in this work as thermoelastic excitation. While previous studies have mainly investigated simplified artificial membrane models or classical acoustic excitation of anatomical middle ears\, thermoelastic stimulation in anatomically realistic middle ear structures has not yet been studied. In this thesis\, an anatomical finite element model of the human middle ear is extended by a small disc placed on the tympanic membrane (TM) and heated by a temperature gradient corresponding to a short single laser pulse. This temperature gradient within the disc induces thermoelastic bending\, which excites vibrations of the TM. The results show that the excitation is transmitted to the stapes footplate\, although displacement amplitudes are smaller than in simplified configurations. The predicted sound pressure levels (SPL) reflect sufficient stimulation in low frequencies\, but show poor response in the high frequency range between 1-4 kHz\, showing potential hearing aid plausibility but only with future optimization. \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nDE: Modellierung der optoakustischen Anregung des Trommelfells \nDie optoakustische Stimulation ist ein Oberbegriff\, der die Erzeugung mechanischer Schwingungen durch optische Bestrahlung beschreibt und in letzter Zeit als mögliches Prinzip für lichtgetriebene Hörsysteme Aufmerksamkeit erregt hat. Ein spezifischer Mechanismus\, der diesem Effekt zugrunde liegt\, ist die thermoelastische Biegung\, die in dieser Arbeit als thermoelastische Anregung bezeichnet wird. Während sich frühere Studien hauptsächlich mit vereinfachten künstlichen Membranmodellen oder mit der klassischen akustischen Anregung anatomischer Mittelohrmodelle beschäftigt haben\, wurde die thermoelastische Stimulation in anatomisch realistischen Mittelohrstrukturen bislang nicht untersucht. In dieser Arbeit wird ein anatomisches Finite-Elemente-Modell des menschlichen Mittelohres um eine kleine Scheibe erweitert\, die auf dem Trommelfell platziert ist und durch einen Temperaturgradienten infolge eines kurzen einzelnen Laserpulses erhitzt wird. Dieser Temperaturgradient innerhalb der Scheibe führt zu einer thermoelastischen Biegung\, die Schwingungen des Trommelfells anregt. Die Ergebnisse zeigen\, dass die Anregung bis zur Steigbügelfußplatte übertragen wird\, obwohl die Verschiebungsamplituden kleiner sind als in vereinfachten Konfigurationen. Die vorhergesagten Schalldruckpegel liegen im niedrigen Frequenzbereich im wahrnehmbaren Hörbereich\, zeigen jedoch im Bereich von 1–4 kHz eine deutlich reduzierte Ausprägung\, sodass eine Anwendung als Hörhilfe nur bei weiterer Optimierung realistisch erscheint. Der Vortrag wird auf Englisch gehalten. \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/aks-arora-modelling-the-optoacoustic-stimulation-of-the-eardrum/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Bachelorarbeit
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260529T113000
DTEND;TZID=Europe/Berlin:20260529T120000
DTSTAMP:20260723T170301
CREATED:20260518T120341Z
LAST-MODIFIED:20260518T120341Z
UID:3988-1780054200-1780056000@blog.rwth-aachen.de
SUMMARY:Jia Hui Qiang: Einflussanalyse der Beugungsordnungen auf die akustische Wahrnehmung statischer Schallquellen in urbanen Simulationen
DESCRIPTION:Die realitätsnahe Simulation der Schallausbreitung in urbanen Umgebungen ist von zentraler Bedeutung für zahlreiche Anwendungsfelder wie Virtual Reality\, Lärmkartierung und Auralisation. Eine besondere Herausforderung stellt dabei die Modellierung von Beugungseffekten dar\, also der Schallausbreitung um Hindernisse wie städtische Gebäude. Klassische Methoden der geometrischen Akustik wie das Raytracing erfassen diese Effekte nur unzureichend. Erweiterte Verfahren wie die Uniform Theory of Diffraction (UTD) ermöglichen zwar eine präzisere Abbildung der Beugung\, führen jedoch mit jeder zusätzlichen Beugungsordnung zu einem exponentiellen Anstieg des Rechenaufwands. \nZiel dieser Arbeit ist es\, den Einfluss von Beugungs- und Reflexionsordnungen auf die akustische Wahrnehmung in städtischen Umgebungen systematisch zu untersuchen. Dabei wird die perzeptive Relevanz der Ordnungen analysiert und ein methodischer Ansatz zur Bestimmung eines optimalen Schwellwerts entwickelt\, bei dem der Modellierungsaufwand minimiert wird\, ohne die wahrgenommene Plausibilität zu beeinträchtigen. Hierzu werden psychoakustische Parameter wie Lautheit\, Rauigkeit und Schärfe verwendet\, um die Wahrnehmungsschwelle zu bestimmen\, an der für das menschliche Gehör keine signifikanten Unterschiede mehr wahrnehmbar sind (Just Noticeable Difference\, JND). Hierzu werden Schallpfade in urbanen Geometrien unter Berücksichtigung von Beugungen und Reflexionen berechnet. Ein Selektionsalgorithmus wird entwickelt\, um die wahrnehmungsrelevanten Ordnungen zu identifizieren. \nDie Ergebnisse sollen zeigen\, dass die optimale Beugungs- und Reflexionsordnung stark von der urbanen Geometrie abhängt. Komplexere Strukturen führen zu intensiveren Interaktionen zwischen Beugungen und Reflexionen. Zudem werden die Limitationen der psychoakustischen Parameter und die Unterschiede in der Wahrnehmung deterministischer und stochastischer Signale diskutiert. \nEN: Impact analysis of diffraction orders on the acoustic perception of static sound sources in urban simulations \nPerceptually plausible simulation of sound propagation in urban environments is of central importance for a variety of applications\, including virtual reality\, noise mapping\, and auralization. A particular challenge in this context is modeling diffraction effects\, i.e.\, sound propagation around obstacles such as urban buildings. Classical methods of geometric acoustics\, such as ray tracing\, capture these effects only inadequately. Advanced methods like the Uniform Theory of Diffraction (UTD) provide a more accurate representation of diffraction but result in an exponential increase in computational effort with each additional diffraction order.  \nThe goal of this work is to systematically investigate the impact of diffraction and reflection orders on the acoustic perception in urban environments. The perceptual relevance of these orders is analyzed\, and a methodological approach is developed to determine an optimal threshold that minimizes modeling effort without compromising perceived plausibility. Psychoacoustic parameters such as loudness\, roughness\, and sharpness are used to identify the point at which no significant differences are perceived by the human ear (Just Noticeable Difference\, JND). Sound paths in urban geometries are calculated\, taking into account diffraction and reflections. A selection algorithm is employed to identify perceptually relevant orders. \nThe results aim to show that the optimal diffraction and reflection order strongly depends on the urban geometry. More complex structures lead to more intense interactions between diffraction and reflections. Furthermore\, the limitations of the psychoacoustic parameters and the differences in the perception of deterministic and stochastic signals are discussed. The talk will be given in German. \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/jia-hui-qiang-einflussanalyse-der-beugungsordnungen-auf-die-akustische-wahrnehmung-statischer-schallquellen-in-urbanen-simulationen/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Bachelorarbeit
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