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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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, […]
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. […]
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 […]
Im Rahmen dieser Bachelorarbeit werden Außenohrübertragungsfunktionen (head-related transfer functions, kurz HRTFs) basierend auf 3D-Modellen untersucht. Eine HRTF beschreibt den richtungsabhängigen Filterprozess, den ein Schallereignis ausgehend von einer Schallquelle bis zum Ohr erfährt. Sie wird durch Torso, Kopf und Pinna beeinflusst. Durch die genannten Körperteile kommt es zu Reflexionen und Beugungen des Schalls, sowie zu Resonanzen. […]
In January 2021, a junior research group will be born inside RWTH Aachen University. The Person-focused Analysis of Architectural Desgin group aims to elaborate an architectural design categorization based on expert and non-expert judgements of buildings in a long term project. The impact of architectural design on daily life activities is studied in separated modalities […]
Ultrasonic metal welding (USMW) has received significant attention in recent years. It is particularly suitable for connecting electrotechnical components and has been widely used in various industrial applications. However, the bond quality in USMW fluctuates due to a large number of influencing variables which may affect the joint strength. The welding process should thus be […]
Binaural hearing is a complex process that is significantly influenced by physical attributes of the listener. These dependencies on the shape of the torso, head, but also the resonance properties of the pinna can be summarized in a digital filter, the so-called head-related transfer function (HRTF). Such HRTFs are not only widely used in the […]
In order to provide a diagnosis about the urban sound environment, especially for traffic, sound classification using deep learning with convolutional neural networks has received increasing attention. There are already some attempts of deep convolutional neural networks (CNN) for environmental sound classification and data augmentation. These CNNs are using spectro-temporal patterns as its input to […]
Kommunikation im Alltag findet selten in einer ruhigen und nachhallarmen Umgebung statt. Tatsächlich spielt sich ein Großteil der Kommunikation und des Lernens in lauten, halligen und von Störgeräuschen geprägten Umgebungen ab. Kinder haben unter diesen Bedingungen im Vergleich zu Erwachsenen größere Schwierigkeiten, die Sprache zu verstehen. Die optimale Nachhallzeit im Zusammenhang mit der Sprachverständlichkeit ist bei […]
In Bildungseinrichtungen sind Kinder häufig inneren und äußeren Lärmeinflüssen ausgesetzt. Die externen Geräusche haben Lärm durch anliegende Straßen oder Spielplätze oder gegebenenfalls durch Flugzeuge zur Ursache. Auf der anderen Seite sind die inneren Geräusche bedingt durch die Anzahl und das Alter der Kinder, sowie die Art der Aktivität. Beide Arten von Einflüssen haben Auswirkungen auf […]
The façade sound insulation is important in perspective that the growing traffic noise is causing annoyance in daily life activities in residential dwellings as well in worksites. The available façade sound insulation models depend on direct part of the sound field transmitted from the outdoor sources. From direct part of the sound field, façade sound […]
In recent times, measurement systems for acquiring individual head-related transfer functions (HRTFs) by inserting microphones at the entrances of both ear canals and recording the emitted sound signals of loudspeaker arrays have been presented. Various applications in research and development rely on precise binaural signals, for example to convincingly locate sound sources in a three-dimensional […]
The impulse response of a room describes the acoustic transmission path between a given source and receiver. One way to acquired an impulse response is by using simulations of a virtual environment. With auralization techniques, such an impulse response can be employed to listen to the virtual room. In a following step, these simulations can […]
This thesis aims at modelling and simulating the transmission paths of sound in the human auditory system using the finite element method. For this, a 3D model will be constructed and with the use of the multiphysics simulation software Comsol, the transmission of sound through different paths of the auditory system will be simulated. Through […]
Akustik-Forschung