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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250829T103000
DTEND;TZID=Europe/Berlin:20250829T110000
DTSTAMP:20260504T010739
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250829T110000
DTEND;TZID=Europe/Berlin:20250829T113000
DTSTAMP:20260504T010739
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:20260504T010739
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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