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Akustik-Blog

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AbiRaad: Using Dynamic Time Warping to analyse time data: advantages and limitations

Zoom-Meeting

This presentation discusses the advantages and limitations of using Dynamic Time Warping (DTW) to quantify the similarity between measurements of different weldings. In this project, machine vibrations and airborne sound occurring during Ultrasonic sheet Metal Welding are recorded, using two laser Doppler vibrometers and a microphone. The goal of the project is to get a better understanding of the processes that occur during […]

Merrill: Using Large-Scale Microphone Arrays for Acoustic Source Localization and Geometric Reconstruction

Zoom-Meeting

Large-scale microphone arrays allow for a detailed analysis of room acoustics and the identification of individual sound waves as they move about the room. Although these data help us to track reflections in the room, the massive amount of data in very large arrays requires new analysis strategies. This thesis extends current source localization and […]

Kohnen: Physical mismatch between loudspeaker and headphone reproduction

Zoom-Meeting

This project is a cross-site investigation with the university of Oldenburg. 14 participants were measured at both sites in terms of HRTFs and HpTFs at two different positions: at the ear drum using probe tube microphones and at the blocked ear canal entrance using mems microphones. The cross site measurements are used to verify whether […]

Kersten: Directional Sound Field Decay in Reverberation Rooms

Zoom-Meeting

According to ISO 345, the random-incidence sound absorption coefficient is measured in a reverberation room by determining the different reverberation times with and without the absorber inserted. The sound field in the room is assumed to be diffuse. Thus, the corresponding energy decay curves would be strictly exponential, but turn out to represent multiple decay […]

Klein: Exploring methods to relate room acoustics and in-situ measurements with noise perception of children in schools

Zoom-Meeting

Poor acoustic conditions in educational institutions affect children. A noisy environment puts children under constant stress and impairs their performance. Most of the present research and standards concerning classroom acoustics focus on reverberation time and background noise level, although it is agreed upon that these measures do not provide comprehensive information on the noise perception […]

Hasti: Musical Blind Source Separation Using Ambisonics

Zoom-Meeting

This talk will address the musical blind source separation problem: given multiple instrument tracks recorded together, how can each be isolated from the others given no additional knowledge about the instrument locations or sounds? There are many advantages to solving the problem: live performances can convey the energy of the performers, and the sound of […]

Aspöck: Validation of room acoustic simulation models

Zoom-Meeting

Already in ancient times, the goal existed to design appropriate environments to transport acoustic signals from a sound source to an audience. Strongly connected to this is the interest to understand room acoustic effects and, in the best case, to accurately predict them. This is of particular relevance today in prestigious projects such as the […]

Schäfer: Towards real-time auralization of aircraft noise using curved propagation paths

Zoom-Meeting

Auralizations of simulationed aircraft flyovers can be used to experience aircraft noise in virtual environments. Compared to averaged sound pressure levels or noise maps, listening to such an auralization provides a more sophisticated impression on how annoying the aircraft noise might be in a real scenario. For proper auralization results, the inhomogeneity of the atmosphere, […]

Hofmann: Entwicklung eines Hörversuchs-paradigmas zur Untersuchung des Einflusses nicht-individueller Außenohrübertragungsfunktionen bei Kindern

Zoom-Meeting

Das binaurale Hören und damit insbesondere die Fähigkeit, Schallquellen im Raum lokalisieren zu können, spielt eine bedeutende Rolle im alltäglichen Leben eines jeden Menschen. Genutzt wird dafür jeweils die eigene, individuelle Außenohrüber-tragungsfunktion (engl. head-related transfer function, HRTF), die von der individuellen Morphologie eines Menschen im Allgemeinen und der Form des Außenohres im Speziellen abhängig ist. […]

Zhaohui: Development of a directional microphone using a horn extension

Zoom-Meeting

The goal of this thesis is building an extension that can reduce the interference of the noise in some precision measurement experiments, which means increasing the directivity of the microphone. To reach this goal, this thesis starts from the theory to the simulation, then build the prototypes and tested them in the experiments. Waveguide and […]