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X-WR-CALDESC:Veranstaltungen für Akustik-Blog
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241105T103000
DTEND;TZID=Europe/Berlin:20241105T113000
DTSTAMP:20260504T225629
CREATED:20241015T102508Z
LAST-MODIFIED:20241015T102508Z
UID:3176-1730802600-1730806200@blog.rwth-aachen.de
SUMMARY:Schäfer: Real-time auralization of aircraft noise considering curved sound propagation
DESCRIPTION:Aircraft are one of the major noise sources affecting residents close to airports. Classical metrics for noise assessment are usually derived from energy-based quantities\, such as known from noise maps. Thus\, they only consider human perception in a very basic manner. To investigate the impact of aircraft noise in a more accurate way\, it is desired to conduct experiments focusing on human perception by presenting audible signals. This can be achieved in virtual acoustic environments. In this context\, auralization is an approach to synthesize these audio signals based on virtual scenarios. \nOne important requirement for auralization is a model for sound propagation from the aircraft to the listener. Typical aircraft auralization approaches use the simplification of a homogeneous medium and a flat ground. However\, the atmosphere is generally inhomogeneous and moving leading to sound propagating along curved paths. Furthermore\, sound generally interacts with urban structures within residential areas\, e.g. leading to reflections and diffraction or occlusion of the direct sound. \nThis work aims to overcome these simplifications in order to allow the consideration of aircraft noise in more realistic acoustic virtual environments. For this purpose\, an aircraft auralization approach considering curved sound propagation in the atmosphere is proposed. This includes a computationally efficient method to simulate the curved sound paths connecting a source and a receiver\, while still assuming a flat ground. It is based on a ray tracing algorithm for inhomogeneous\, moving media and uses a divide-and-conquer routine to significantly reduce the number of calculated rays. Furthermore\, a procedure for scheduling these simulations and interpolating respective results is presented\, which enables to perform such auralizations in real time. \nFinally\, an interface method is introduced allowing to combine the presented curved propagation approach with urban auralization methods. Such methods consider the interaction with urban structures but assume straight-path propagation. The proposed interface finds a virtual source position for the urban auralization in order to maintain the acoustic properties resulting from the curved propagation through the atmosphere\, e.g. incident direction at the receiver and propagation delay. The method was applied to a street canyon scenario. The auralization result highlights the relevance of considering sound interaction with urban structures. This is especially prominent when the direct sound is occluded and therefore\, reflected and diffracted sound paths have a significant effect on the localization of the aircraft. \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/schaefer-real-time-auralization-of-aircraft-noise-considering-curved-sound-propagation/
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:20241105T113000
DTEND;TZID=Europe/Berlin:20241105T123000
DTSTAMP:20260504T225629
CREATED:20241015T102701Z
LAST-MODIFIED:20241015T102701Z
UID:3178-1730806200-1730809800@blog.rwth-aachen.de
SUMMARY:Kohnen: Combining Reproduction Techniques for Room Auralizations
DESCRIPTION:Spatial auditory information allows humans to separate sources from each other. Furthermore\, source localisation can steer the focus towards events that are not in sight. 3D sound is hence an important feature of human hearing. To investigate the particular effects of sound perception\, a controlled reproduction of spatial sound is needed in order to recreate an acoustic scene as accurately as possible. In contrast to headphone-based reproduction\, spatial sound presentation via loudspeakers lowers the inhibition threshold as no device has to be attached to the listener. It also increases immersion into the scene as well as allowing communication between listeners or with a supervisor. The virtual acoustic scenes are typically simulated by auralization. The basis are computer simulations of room impulse responses (RIR)\, which can physically and perceptually be divided into different time sections: direct sound\, early reflections and diffuse decay. Furthermore\, different\, loudspeaker-based reproduction methods exist with individual strengths and weaknesses. Preceding investigations hint\, that for the perceptually relevant qualities of each time section one reproduction method is optimal\, while the shortcomings of this reproduction method only applies for qualities that are relevant in another time section of the RIR. \nThe goal of the thesis is to implement a system that combines different reproduction methods to optimise the sound reproduction of virtual rooms. The user should furthermore be integrated into the system and the virtual room\, i.e. speaking should result in a room dependent perception of reverberation. Additionally\, the influence of the room the loudspeakers are placed in (listening room) should be compensated to avoid the requirement of an anechoic chamber for reproduction. \nThe creation of such a system is based on various steps. The individual systems have to be implemented and combined with the room acoustical simulation. The techniques implemented are binaural crosstalk cancellation (CTC)\, 2nd Order Ambisonics and Vector-Base Amplitude Panning (VBAP) due to their ability to provide full\, three-dimensional source positioning. They are tested against each other in various perceptual qualities including localisation accuracy. To keep the original structure of the RIR\, and ensure a correct transition between the reproduction techniques\, their loudness has to be calibrated against a reference condition. To compensate the room\, prior knowledge of the virtual room and the listening room is used. The virtual room is changed until the combination of virtual room and listening room complies with the unchanged virtual room. \nBased on the findings\, a suitable reproduction technique is selected for each section of the RIR. The final system is then again tested to verify that improvements in different perceptual qualities are audible and identify any trade-offs. The user integration\, speaking into a virtual room\, is evaluated. \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/kohnen-combining-reproduction-techniques-for-room-auralizations/
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:20241115T110000
DTEND;TZID=Europe/Berlin:20241115T113000
DTSTAMP:20260504T225629
CREATED:20241111T185319Z
LAST-MODIFIED:20241111T185828Z
UID:3225-1731668400-1731670200@blog.rwth-aachen.de
SUMMARY:Klein: Vergleich der Doppelbeugung in Simulation und Messung
DESCRIPTION:In dieser Arbeit wurde das Image Edge Modell anhand von Messungen im Halbraum in Bezug auf Beugungen höherer Ordnung validiert\, damit es in Zukunft für die Simulation der Doppelbeugung in urbanen Szenarien angewendet werden kann. Es ist ein geometrisches Simulationsverfahren in der Akustik\, das bisher mit einer einfachen Beugung überprüft wurde. Im Gegensatz zur Messung arbeitet die Simulation mit einer Vereinfachung\, indem eine Doppelbeugung als zwei separate Beugungen simuliert wird. Es war zu untersuchen\, wie groß die daraus resultierende Abweichung zwischen Messung und Simulation ist. Der Vergleich basiert auf im Halbraum durchgeführten Messungen\, bei denen ein Hindernis aufgestellt wurde. Es konnten Abweichungen innerhalb der Ergebnisse gefunden werden\, die teils auf den Messaufbau und teils auf die Simulation zurückzuführen sind. Die Ergebnisse zeigen\, dass die Doppelbeugung der Messung nur für einen begrenzten Frequenzbereichen durch eine doppelte Beugung der Simulation angenähert werden kann. Es lässt sich jedoch ein Bereich definieren\, in dem diese Annäherung als sinnvoll erachtet wird. Es ist noch zu untersuchen\, ob eine Erweiterung des Bereichs hin zu hohen Frequenzen möglich ist. \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/klein-vergleich-der-doppelbeugung-in-simulation-und-messung/
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:20241115T113000
DTEND;TZID=Europe/Berlin:20241115T120000
DTSTAMP:20260504T225629
CREATED:20241111T183602Z
LAST-MODIFIED:20241111T183602Z
UID:3223-1731670200-1731672000@blog.rwth-aachen.de
SUMMARY:Ke: Feedback Delay Networks and Room Reverberation Enhancement
DESCRIPTION:This presentation covers the internship in the field of audio signal processing at Huawei’s Munich Research Center. Huawei Technologies is a leading global provider of communication technology infrastructure and smart devices. The audiovisual department in Munich is responsible for advanced media technology research\, with a particular focus on the standardization of media codecs and 3D audio technologies aimed at consumer products. This internship involved literature research in the field of artificial reverberation\, specifically focusing on parametric reverberation algorithms based on feedback delay networks (FDN). Additionally\, an FDN-based reverb enhancement system was developed to modify the room’s reverb effect in real time. \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/ke-feedback-delay-networks-and-room-reverberation-enhancement/
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:20241122T110000
DTEND;TZID=Europe/Berlin:20241122T113000
DTSTAMP:20260504T225629
CREATED:20241118T124412Z
LAST-MODIFIED:20241119T094447Z
UID:3238-1732273200-1732275000@blog.rwth-aachen.de
SUMMARY:Litt: Eine Messapparatur für Schallstreuungs-Charakteristiken
DESCRIPTION:DE: \nDie akustische Schallausbreitung kann mit Hilfe von geometrischen Simulationsmethoden effektiv und in hoher Qualität berechnet werden. Dennoch werden zuverlässige Streukoeffizienten benötigt. In dieser Bachelorarbeit wird ein Freifeld Messaufbau weiterentwickelt und validiert\, um das Streumuster unter verschiedenen Schalleinfallswinkeln zu messen. Insbesondere soll ein Lautsprecherbogen weiterentwickelt werden\, der die Messzeit durch verschachtelte Sweeps erheblich verkürzt. \nEN: \nThe acoustic propagation of sound can be calculated effectively and in high quality with geometrical simulation methods. There is still the need for reliable scattering coefficients. In this thesis a freefield measurement method will be further developed and validated to measure the scattering characteristics for different angles of incidence. Especially an arc with loudspeakers shall be developed further to shorten the measurement duration through usage of interleaved sweeps. The presentation will be held 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: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/litt-eine-messapparatur-fuer-schallstreuungs-charakteristiken/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Verteidigung Bachelorarbeit
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