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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250801T110000
DTEND;TZID=Europe/Berlin:20250801T120000
DTSTAMP:20260504T013523
CREATED:20250630T095650Z
LAST-MODIFIED:20250630T095650Z
UID:3505-1754046000-1754049600@blog.rwth-aachen.de
SUMMARY:Kersten: Modeling and analysis of vibroacoustic mechanisms in hearing
DESCRIPTION:Despite significant technological advancements in recent decades\, users of hearing aids and hearing protection often report dissatisfaction due to an „unnatural“ auditory experience. These challenges highlight gaps in our understanding of the physical mechanisms underlying hearing. A familiar example of the complex vibroacoustic phenomena involved – and a major cause of dissatisfaction with hearing technologies – is the occlusion effect: blocking the ear canal alters how one’s own voice is perceived. \nExperimentally assessing the underlying physics poses significant ethical and technical difficulties. Therefore\, modeling and numerical simulations are essential tools for advancing our understanding of hearing. These investigations also require examining the vibroacoustic behavior of the inner ear\, because it serves as the sensor for all pathways inside and around the head. \nThis thesis advances our understanding of the vibroacoustic mechanisms in hearing by systematically separating the auditory system into subsystems. First\, the structural motion of the ear canal is analyzed\, with particular emphasis on how the motions of the ear canal entrance and tympanic membrane interact with the vibrations of the ear canal wall in generating the sound pressure underlying the occlusion effect. Second\, an anatomical finite element model of the human inner ear is introduced. This model is used to investigate the role of the cochlear partition’s flexibility by modeling parts of it as either rigid or flexible structures while applying both air and bone conduction stimulation. \nFuture work should integrate the insights gained from this work into comprehensive models\, such as full-head finite element simulations\, to further elucidate the interactions between the air and bone conduction pathways and their relative importance. Ultimately\, these findings will contribute to improvements in hearing technologies. \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/kersten-modeling-and-analysis-of-vibroacoustic-mechanisms-in-hearing/
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:20250808T110000
DTEND;TZID=Europe/Berlin:20250808T113000
DTSTAMP:20260504T013523
CREATED:20250730T125404Z
LAST-MODIFIED:20250730T125404Z
UID:3531-1754650800-1754652600@blog.rwth-aachen.de
SUMMARY:Klingelnberg: Filter Design for Acoustic Surface Scattering
DESCRIPTION:The propagation of sound can be effectively and accurately modelled using geometrical simulation techniques. Traditional techniques\, such as ray tracing and radiosity\, generate energy decay responses that characterize acoustic interactions within specific environments. These responses can be transformed into impulse responses based on room acoustic models\, facilitating a realistic sound reproduction. Filter synthesis approaches for enclosed spaces can take advantage of room characteristics such as the mean density of sound reflections. However\, it is not feasible to utilize the same acoustic characteristics for open spaces. Therefore\, the outdoor simulation requires a different strategy for synthesizing the impulse response. This bachelor thesis focuses on developing an advanced filter design tailored for scattering surfaces in the auralization process of outdoor environments. It is demonstrated that wavelets appear as a viable solution to emulate the physical interaction between sound waves and surfaces of the acoustic scene. The presentation will be given in English. \nDE: Filterentwurf für akustische Flächenstreuung \nSchallausbreitung kann durch Berechnung geometrischer Simulationsmodelle effektiv und akkurat dargestellt werden. Raytracing und Radiosity als konventionelle Berechnungsansätze liefern den Energieabfall\, der den Nachhall innerhalb einer simulierten Umgebung beschreibt. Im Anschluss kann das zeitliche Energieverhalten in eine Impulsantwort transformiert werden\, um eine realistische Klangwiedergabe in einer Simulation zu erzielen. Auralisierungen von geschlossenen Räumen können mithilfe von Raumeigenschaften wie der durchschnittlichen Reflexionsdichte modelliert werden. Im Freien sind diese akustischen Eigenschaften nicht von Nutzen\, wodurch für diese Simulationen neue Methoden der Berechnung einer Impulsantwort erforderlich sind. Der Fokus dieser Bachelorarbeit liegt auf der Entwicklung von Filtern\, die Besonderheiten von Flächenstreuung in den Auralisierungsprozess von Freiflächen einbeziehen. Es wird gezeigt\, dass Wavelets vielversprechende Ergebnisse für die Modellierung der Interaktion von Schallwellen mit streuenden Flächen liefern. Die Vortragssprache ist Englisch. \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/klingelnberg-filter-design-for-acoustic-surface-scattering/
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:20250813T110000
DTEND;TZID=Europe/Berlin:20250813T120000
DTSTAMP:20260504T013523
CREATED:20250807T145225Z
LAST-MODIFIED:20250807T145225Z
UID:3536-1755082800-1755086400@blog.rwth-aachen.de
SUMMARY:Trinh: Strategies for artificially creating the occlusion effect
DESCRIPTION:The occlusion effect occurs when the ear is completely or partially occluded\, for example when wearing earphones or hearing aids. Sound transmitted through the body is amplified at lower frequencies\, resulting in an altered perception of one’s own voice\, often described as „hollow“ or „talking into a barrel“. This effect is one of the main sources of dissatisfaction with hearing aids\, as the occlusion effect directly alters self-voice perception and remains a key challenge for achieving user acceptance. To address this issue\, a systematic investigation and simulation of a range of occlusion conditions is essential\, taking into account the separate contributions of air- and bone-conducted sound. \nThis thesis develops signal processing strategies that use a microphone and open headphones to create the occlusion effect artificially. Transfer functions for open and occluded ear canal conditions were derived from literature data\, and Finite Impulse Response filters were designed and implemented to enable real-time processing with low latency. The input to the system is the user’s own voice\, captured by a microphone positioned in front of the mouth\, while the output is the processed audio signal reproduced through open headphones to create the occlusion effect at the ear. Initial listening impressions suggest that the simulated effect is perceptually convincing and plausible. This thesis investigates digital filter strategies for occlusion simulation\, providing a foundation for future adaptive implementations that will further improve the realistic reproduction of the occlusion effect. \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/trinh-strategies-for-artificially-creating-the-occlusion-effect/
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:20250822T110000
DTEND;TZID=Europe/Berlin:20250822T113000
DTSTAMP:20260504T013523
CREATED:20250730T125551Z
LAST-MODIFIED:20250730T125551Z
UID:3533-1755860400-1755862200@blog.rwth-aachen.de
SUMMARY:Lingens: Deep Learning methods for detecting and removing artefacts in skin conductance measurements
DESCRIPTION:During my internship at HEAD acoustics\, I mainly worked on signal processing for physiological measurements. In hearing tests and driving simulations in virtual reality\, various physiological parameters are recorded over time in order to quantify the influence of acoustic stimuli on the test subject instead of relying solely on the subsequent questioning of the test subject. For example\, skin conductance is measured with two electrodes on the palm of the non-dominant hand to assess the stress level over time. However\, artefacts quickly occur due to variations in breathing or hand movements. In most cases the necessary metrics for evaluating the stress level cannot be obtained from the signal anymore and the measurements are therefore unusable. \nSince simple filters are not sufficient to remove these artefacts\, the internship mainly focused on finding a deep learning method that can detect the artefacts after performing hearing tests or driving simulations in virtual reality and subsequently remove them automatically. Various architectures from the literature were examined and custom architectures were developed. Public datasets were used for training. The implementation was mainly carried out in Python and PyTorch. Finally\, a series of experiments was conducted with the students at HEAD acoustics to validate the models. \nDE: Deep Learning Methoden zur Erkennung und Entfernung von Artefakten in Messungen der Hautleitfähigkeit \nWährend meines Praktikums bei HEAD acoustics beschäftigte ich mich hauptsächlich mit der Signalverarbeitung von physiologischen Messungen. In Hörversuchen und Fahrsimulationen in Virtual Reality werden unterschiedliche physiologische Parameter über die Zeit aufgezeichnet\, um den Einfluss akustischer Stimuli auf den Probanden zu quantifizieren anstatt sich ausschließlich auf die anschließende Befragung des Probanden zu verlassen. Beispielsweise wird die Hautleitfähigkeit mit zwei Elektroden an der Handfläche der nichtdominanten Hand gemessen\, um das Stresslevel über die Zeit zu bewerten. Hierbei treten schnell Artefakte durch Variation der Atmung oder Bewegung der Hände auf\, sodass in den meisten Fällen aus dem Signal die nötigen Größen zur Auswertung nicht extrahiert werden können und die Messungen somit unbrauchbar sind. \nDa zur Entfernung dieser Artefakte einfache Filter nicht ausreichen\, wurde im Rahmen des Praktikums versucht eine Deep Learning Methode zu finden\, welches die Artefakte nach der Durchführung von Hörversuchen oder Fahrsimulationen in Virtual Reality erkennen und nachträglich automatisch entfernen kann. Hierbei wurden unterschiedliche Architekturen aus der Literatur untersucht und eigene Architekturen entwickelt. Für Trainingszwecke wurden öffentlich zugängliche Datensätze genutzt. Die Implementierung erfolgte hauptsächlich in Python und PyTorch. Abschließend wurde eine Versuchsreihe mit den Studenten bei HEAD acoustics durchgeführt\, um die Modelle zu validieren. \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/lingens-deep-learning-methods-for-detecting-and-removing-artefacts-in-skin-conductance-measurements/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag Praxissemester
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250825T130000
DTEND;TZID=Europe/Berlin:20250825T140000
DTSTAMP:20260504T013523
CREATED:20250812T155013Z
LAST-MODIFIED:20250820T135533Z
UID:3538-1756126800-1756130400@blog.rwth-aachen.de
SUMMARY:Baylan: Influence of room acoustics on cognitive performance in populated audiovisual scenes
DESCRIPTION:The complexity of populated real-life environments is hard to recreate in laboratory listening experiments. Using Virtual Reality (VR)\, this complexity can be simulated with close-to-real-life environments\, while maintaining high controllability and reproducibility. However\, there is a lack of guidelines which aspects of reality have to be represented in the virtual environments to ensure ecological validity. Studies may only focus on auditory representation of sound sources\, use unrealistic or static background noise\, or disregard the use of room acoustic simulation for simplicity. \nThe central objective of this study was to develop an audiovisual VR framework that provides a closer-to-real-life environment than many other VR experiments used to this day\, using realistic background noise represented visually by embodied agents. With this framework\, the influence of room acoustics on listening effort and memory in an open-plan office environment was investigated by comparing three acoustic conditions: free-field acoustics\, an „out-of-the-box“ reconstruction of an open-plan office\, and an acoustically treated version of that model. The mid-frequency reverberation times were T30 = 0.0 s\, 1.0 s and 0.5 s respectively. \nListening effort was quantified by testing 30 participants in a dual-task paradigm\, during which participants performed a primary heard text recall task and a secondary vibrotactile pattern recognition task. Results strongly indicate lower listening effort in the free-field condition compared to both room acoustic simulations. No significant differences between the two room acoustic simulations were found. It is concluded that findings obtained from studies using free-field acoustics differ from more ecologically valid scenarios considering room acoustics. \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:  https://rwth.zoom-x.de/j/65486470594?pwd=lbiSQdbOLU8MGJWZY9A8zwIQbOezTa.1  \nPasswort: 654643
URL:https://blog.rwth-aachen.de/akustik/event/baylan-einfluss-von-raumakustik-auf-die-kognitive-leistung-in-populierten-audiovisuellen-szenen/
LOCATION:Seminarraum 2.70 (OG)\, Pauwelsstr. 20\, D-52074 Aachen
CATEGORIES:Verteidigung Masterarbeit
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250829T103000
DTEND;TZID=Europe/Berlin:20250829T110000
DTSTAMP:20260504T013523
CREATED:20250818T115347Z
LAST-MODIFIED:20250829T091740Z
UID:3565-1756463400-1756465200@blog.rwth-aachen.de
SUMMARY:Denk: Mechanisms and potential for optical stimulation of the eardrum
DESCRIPTION:Perception of sound may be created by irradiating the eardrum with appropriately modulated pulsed light. Such optical stimulation might have several benefits compared to acoustic miniature transducers\, including wide-band sound reproduction without the necessity to close the ear canal\, and low risk of feedback. Until now\, the underlying opto-acoustic transduction mechanisms have not been fully characterized. In turn\, it is hard to estimate the limits for equivalent sound pressure generation\, or systematically optimize stimulation parameters like the optical wavelength and pulse durations. \nWe examined several potential transduction mechanisms that are based on expansion of tissue or surrounding air due to light absorption at different structures of the external and middle ear by means of theoretical estimations and experiments. Measurements were conducted in artificial phantoms of the eardrum and middle ear that were tailored to light absorption at specific structures. Measurements included synchronous recordings of sound pressure at both sides of the artificial eardrum\, and displacement of the eardrum using phase-sensitive Optical Coherence Tomography in response to nanosecond laser pulses. The results give insights about which transduction mechanisms are dominating and most promising for applications in real ears\, and guide the way to a systematic optimization of opto-acoustic stimulation technology. \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/denk-mechanisms-and-potential-for-optical-stimulation-of-the-eardrum/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250829T110000
DTEND;TZID=Europe/Berlin:20250829T113000
DTSTAMP:20260504T013523
CREATED:20250820T135705Z
LAST-MODIFIED:20250829T091730Z
UID:3569-1756465200-1756467000@blog.rwth-aachen.de
SUMMARY:Redlin: Simulation of the optoaccoustic stimulation of an experimental tympanic membrane
DESCRIPTION:The optoacoustic effect describes the creation of sound by means of radiation\, mainly through the effects of differing temperature inside a target material. The full physical mechanisms behind the phenomenom are currently being studied\, with the goal of using the effect among other things to the advantage of creating sound perception in humans directly at the tympanic membrane. Methodical testing seems to be necessary to get closer towards a useable product\, but because of the many possible degrees of optimization it could be resource heavy and timeconsuming. This thesis aims to identify relevant factors that impact the effect\, by simulating the effects of a single laser pulse on a experimental tympanic membrane through the creation of a digital twin of a current experimental setup of the Deutsches Hörgeräte Institut GmbH inside the software COMSOL Multiphysics. The digitalization of the Problem gives way to easy systematic testing and the results of first parametric sweeps give insights to the relevance of certain parameters on the resulting vibrations. \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/redlin-simulation-of-the-optoaccoustic-stimulation-of-an-experimental-tympanic-membrane/
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:20250829T113000
DTEND;TZID=Europe/Berlin:20250829T120000
DTSTAMP:20260504T013523
CREATED:20250820T135839Z
LAST-MODIFIED:20250829T091604Z
UID:3571-1756467000-1756468800@blog.rwth-aachen.de
SUMMARY:Üçok: Listening Efficiency in Children in Classroom Noise: A Data Analysis
DESCRIPTION:Children spend much of their day in classrooms where understanding speech is often challenged by background noise [Shield and Dockrell\, 2003]. This thesis reanalyzes data from two studies [Seitz et al.\, 2024; Seitz and Fels\, 2025] to investigate how efficiently primary school children listen in classroom settings\, using the metrics „Direct Listening Efficiency“ [Prodi et al.\, 2010]\, „Linear Integrated Speed–Accuracy Score“ [Liesefeld and Janczyk\, 2019]\, „Balanced Integration Score“ [Liesefeld and Janczyk\, 2019] and „Inverse Efficiency Score“ [Townsend and Ashby\, 1983]. It examined how efficiency relates to children’s listening effort\, and how it is affected by different factors like age group\, noise/acoustic condition and task type. The trends that were observed for both experiments were that older children showed higher efficiency scores compared to the younger ones\, that noise had a significant effect on children’s listening efficiency and that children showed lower listening efficiency in more difficult task types (dual-task). Also\, in both experiments\, results indicated that listening efficiency had a trend of being negatively correlated with subjective ratings of listening effort. These findings indicate that listening efficiency captures the speed-accuracy trade-off effect in realistic classroom environments. As a metric\, it complements traditional measures such as the response time and could be used to guide acoustic improvements to support children’s listening in noise. \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/uecok-listening-efficiency-in-children-in-classroom-noise-a-data-analysis/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Bachelorarbeit
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