The acoustic scattering of surface is very important in all aspects of room acoustics like in concert halls and reverberation rooms. The acoustic propagation of sound can be calculated effectively and in high quality by geometrical simulation methods. Nevertheless, reliable scattering coefficients are needed. In this master’s thesis, the uncertainty of standardized measurement methods will […]
Progress in the field of computer-based calculation and simulation of sound fields and acoustic propagation effects enable numerous new applications for auralisation, e.g. design of cities and buildings, noise reduction and machine learning. In addition to the consideration of audible propagation effects a realistic synthesis of the source signal is essential for the generation of […]
In recent years, the use of techniques based on machine learning has increased and expanded to different areas. The increasing computing capacity and the availability of public datasets have allowed the development of these techniques, particularly deep learning, that today are considered the state of the art in topics such as pattern recognition, natural language […]
Hearing loss (HL) has multifaceted negative consequences for individuals of all age groups. Despite individual fitting based on clinical assessment, consequent usage of hearing aids (HAs) as a remedy is often discouraged due to unsatisfactory HA performance. Consequently, the methodological complexity in the development of HA algorithms has been increased by employing virtual acoustic environments, […]
For more than 15 years the GPA has been working on the design and implementation of acoustic sensor arrays that by means of classical beamforming techniques allow to electronically position a beam in space. The evolution of acoustic array construction technologies will be analyzed from the analog field with conventional microphones, AD/DA converters and DSP […]
Listening effort is defined as the use of cognitive resources necessary to complete a task or follow a conversation. The words heard must be consciously received in order to understand, processed and further communicate. Communication is an essential part of everyday social life and is usually connected with background noise. The aim of this work […]
HEAD acoustics GmbH, based in Herzogenrath near Aachen, is one of the leading companies in integrated acoustic solutions as well as sound and vibration analysis. The internship was carried out in the research department Sound Perception and Assessment and focused on the area of physiological measurements for the detection of stress reactions. It involved the […]
The building of a concert hall is a process of many aspects and stages - some of which have to do with acoustics. In this talk we will share insights from Müller-BBMs’ extensive experience in the topic by means of a project case study: Musikzentrum Bochum. The various acoustic planning stages within a given project […]
Regardless of the field, measurements are essential for the validation of theories and for making well-founded decisions. A criterion for the validity and comparability of measured values is their uncertainty. The "Guide to the Expression of Uncertainty in Measurement" (GUM) provides a standardized framework for determining and interpreting measurement uncertainty. In room acoustic measurements, the […]
Drägerwerk, short Dräger, is a leading company in the fields of both medical and safety technology. Based in Lübeck, the company has employees and customers around the globe and is well-known for lifesaving equipment like ventilators, anaesthesia machines and respiratory protection. The internship took place in the Research and Development department within the business unit […]
Building acoustics auralization is used to assess the perceptual aspects of sound transmission in built environments to provide the guidelines for architectural constructions and to evaluate the noise effects on humans. These noise effects have a negative influence on daily-life activities and create disturbances in physical and metal work. These disturbances are present within the […]
First part describes the new building acoustics and psychoacoustics laboratories launched in 2020. Second part is the overview the important recent publications, which deal with, e.g., room acoustics in open-plan offices, office pods, perception of façade sound insulation, and wind turbine health effects. Third part gives an overview of current research projects, which deal with […]
Open-plan offices have been popular for their significant advantages such as economical savings and flexible layout design. However, according to several questionnaire studies, noise, and in particular, irrelevant speech has been rated as the major source of annoyance in open-plan offices, which impairs concentration severely and causes productivity decline. As the Irrelevant Sound Effect (ISE) […]
Dieser Vortrag beschäftigt sich mit der Ersatzschaltbildmodellierung des Knochenschalls. Die Knochenleitung beschreibt die Übertragung von Schall als Schwingungen im Schädel Knochen und dem umgebenden Weichteilgewebe zum Innenohr. Es gibt fünf verschiedene Wege, die oft als wichtig für den Knochenleitung Schall angesehen werden: Schalldruck im Gehörgang, Trägheit des Mittelohrs, Trägheit der Innen Innenohrflüssigkeit, Kompression des Innenohrraums […]
People perceive most events with several senses at the same time. In everyday life, these different sensations coincide in time and space to form one coherent percept. However, in online conferencing, which has become an increasingly popular mean of communication, there may be a temporal and/or spatial mismatch between visual and auditory input, e.g., due […]
In recent years, the use of virtual reality in research has greatly increased due to its ability to recreate complicated and realistic circumstances in a well-controlled laboratory environment. In this thesis the use of three different auditory cues in a auditory selective attention experiment in virtual reality is studied and validated, examining which of them […]
Over the last few years, virtual reality (VR) has emerged as a new technology that is allowing scientific research to investigate topics from another perspective. This is due to the possibility of creating more realistic scenarios in which all the variables are controlled. Thus, the conclusions taken from such research are more consistent since the […]
This paper describes the results of a subjective evaluation of classroom auralizations with different levels of detail(LOD) by a listening test. Computer Modeling of the classroom with different LOD and the auralizations are realized by using RAVEN, after which the listening test procedure and the analyzed results are presented. The task of listening test is […]
Conventional acoustic simulations are based on CAD models. The creation of the 3D model requires modeling expertise and time. Additionally, the variety of model strategies makes this process difficult to reproduce. In contrast, Photogrammetry techniques can economically achieve valid representations of rooms. However, the models created using Photogrammetry are aimed at visualization purposes. The models […]
Lärm wird nicht nur oft als störend empfunden, sondern kann sich negativ auf unsere physische und psychische Gesundheit auswirken. Während Umgebungsgeräusche vor 200 und mehr Jahren noch ausschließlich natürlichen Ursprungs waren, sind dem Lärm seit der Industrialisierung kaum noch Grenzen zu setzen. Dennoch gibt es in Deutschland das Bundes-Immissionsschutzgesetz, mit denen der Lärm in unserem […]
Akustik-Forschung