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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240411T130000
DTEND;TZID=Europe/Berlin:20240411T140000
DTSTAMP:20260507T024105
CREATED:20240404T194818Z
LAST-MODIFIED:20240404T194818Z
UID:2968-1712840400-1712844000@blog.rwth-aachen.de
SUMMARY:Liu: Exploring Listening Effort in Primary School Classrooms
DESCRIPTION:In primary schools\, various activities can be conducted during classes. To improve the quality of communication\, it was aimed to understand children’s listening effort during different types of activities. In this thesis\, the measurements were conducted in first and fourth grade in primary schools. Listening effort was assessed subjectively by the children in the means of answering questionnaires. The questionnaires were based on different indicators related to listening effort\, and they were answered by the children according to different activities. In addition\, background noise was recorded during different class activities so that the acoustic parameters of the background noise in different activities could be obtained. Finally\, all the obtained data was analyzed to investigate whether there is a relationship between the scores from the questionnaires\, acoustic parameters\, activity types\, and children’s grades. \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/liu-exploring-listening-effort-in-primary-school-classrooms/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Masterarbeit
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20240412T110000
DTEND;TZID=Europe/Berlin:20240412T120000
DTSTAMP:20260507T024105
CREATED:20240322T110824Z
LAST-MODIFIED:20240322T111005Z
UID:2964-1712919600-1712923200@blog.rwth-aachen.de
SUMMARY:Lobato: Improving sound source localization and characterization with machine learning techniques
DESCRIPTION:is thesis addresses key challenges in acoustics applications like troubleshooting\, product optimization\, and sound source modeling\, focusing on the localization and characterization of sound sources using Beamforming techniques and an improved regularization of inverse methods. Traditional Beamforming methods\, while effective in identifying main radiating sources\, are limited by the array size and density\, which affects their accuracy and increases cost. To address the high computation time and incompatibility with real-time applications of existing deconvolution methods\, this work introduces a beamforming pre-processing step employing neural networks. The approach is based on a grid compression of the beamforming map and can drastically accelerate the deconvolution process by 2 to 3 orders of magnitude\, enabling real-time applications without losing accuracy. \nFurthermore\, the thesis proposes a solution to the Beamforming assumption of a monopole source\, a major limitation especially in aeroacoustic applications where higher-order sources like dipoles and quadrupoles may be present. By expanding the DAMAS deconvolution method\, this thesis offers a method capable of handling these higher-order sources efficiently in real-time\, without relying on a sensitive (and often unreliable) hyperparameter tuning. This method also supports solving for sources based on multiple Beamforming results simultaneously\, overcoming the limitations of current costly approaches. \nAnother significant contribution of this work is in estimating the radiation characteristics of sound sources\, traditionally dependent on expensive setups of spherical arrays for a high-resolution characterization. The thesis introduces a method\, HELS Flow\, which utilizes empirical priors learned through normalizing flows parameterized by neural networks\, allowing for a substantial reduction in the number of microphones needed in the array without significantly compromising the resolution. This work shows that\, after relevant training\, the method can outperform traditional regularization approaches even when their hyperparameters are optimally selected. \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/lobato-improving-sound-source-localization-and-characterization-with-machine-learning-techniques/
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:20240425T110000
DTEND;TZID=Europe/Berlin:20240425T120000
DTSTAMP:20260507T024105
CREATED:20240415T143805Z
LAST-MODIFIED:20240418T120957Z
UID:2971-1714042800-1714046400@blog.rwth-aachen.de
SUMMARY:Rehman: Comparison of VR and web-based listening experiments on the perception in complex auralized environments
DESCRIPTION:Audiovisual listening experiments are crucial for understanding acoustical noise and human sound perception. However\, traditional VR setups are limited by the need for expensive equipment and time-consuming laboratory sessions. As a result\, interest in online experiments has been growing\, especially since the COVID-19 pandemic. So far\, these experiments have been restricted to basic setups lacking interactivity. This study presents a novel approach where experiments are simulated on a server and streamed in real time. The approach is validated by conducting a within-subject study comparing VR and streaming methods. For this purpose\, four noise conditions have been built based on a virtual urban scene in Unreal Engine\, and a real-time auralization pipeline was constructed. Within this scope\, custom virtual sound sources for the Unreal Engine were created and support for sound source directivities added to the auralization chain built around Virtual Acoustics (VA). Results show minimal differences in annoyance and soundscape ratings between the two methods. Feeling of presence suffered during streaming\, yet the subjects’ attention was not significantly impacted. Accessibility and quality ratings also produced promising results. Visual quality ratings suffered mildly from the switch to Streaming\, but auralization quality was rated equally positive in both cases. Overall audiovisual quality ratings for the Streaming case were very promising. This validates the potential of online streaming for such multisensory experiments. \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/rehman-comparison-of-vr-and-web-based-listening-experiments-on-the-perception-in-complex-auralized-environments/
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:20240426T110000
DTEND;TZID=Europe/Berlin:20240426T113000
DTSTAMP:20260507T024105
CREATED:20240415T144201Z
LAST-MODIFIED:20240415T144201Z
UID:2973-1714129200-1714131000@blog.rwth-aachen.de
SUMMARY:Rummler: Scale Model Study of Audience Related Transfer Functions (ARTF) for Direct Sound and Early Reflections – Internship with Kahle Acoustics srl
DESCRIPTION:A 1:20 scale model has been constructed to investigate grazing attenuation by seats and audience at various angles of sound incidence\, for both direct sound and early reflections. Transfer functions for a range of azimuth and elevation angles have been measured both for unupholstered seats and with modeled audience: these are referred to as the Audience Related Transfer Functions (ARTF). The measurements reveal not only the low frequency seat dip effect and its dependency on the incidence angle but also show a significant broadband attenuation. This broadband attenuation is strongly inversely dependent on the source elevation and can reach up to 16 dB between 400 Hz and 3 kHz. This has consequences equally for the direct sound and early reflections in auditoria. Subsequently scale model measurements using a finite size reflector to compensate for the mid frequency attenuation are discussed. A greater efficiency of audience coverage can be achieved with low-elevation early reflections (the so-called solid angle principle). Analyzing the measured ARTF\, the reflection level also suffers from grazing attenuation inversely dependent on the elevation angle. Balancing the solid angle principle with the grazing attenuation\, an optimized elevation for the reflection surface is proposed. \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/rummler-scale-model-study-of-audience-related-transfer-functions-artf-for-direct-sound-and-early-reflections-internship-with-kahle-acoustics-srl/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag Praxissemester
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