The absorption coefficient is a central parameter in the room acoustic design process. It can be measured in an impedance tube for normal sound incidence or in the reverberation chamber for random incidence. To guarantee a standardized test environment for reverberation chambers, the international standard ISO 354 suggests a measurement procedure to increase the diffusivity […]
Huawei is founded in 1987 in Shenzhen, China. Huawei is a leading global provider of information and communications technology (ICT) infrastructure and smart devices. Starting from the 1st of Sep in 2018, I started my internship at Huawei Technologies Germany GmbH in Dusseldorf. My internship lasts five months in total, and the activity ends on […]
Aachen based, KLANG:technologies produces Hard- and Software to deliver immersive, three dimensional in-ear monitor mixes for musicians. This is achieved using binaural technologies. The focus is to give the musician a simple to use interface. During the internship, the task was to develop a tool that can automatically measure KLANG products and determine if the […]
Over the past few decades, research began to focus increasingly on the use of spherical microphone arrays to study the spatial properties of acoustic wave fields. To estimate the plane wave incidence accurately, the unwanted effects generated by the spherical microphone array itself in the recorded sound pressure should be eliminated by radial filtering. To […]
In virtual audio, sound sources need to be modeled as realistically as possible to achieve a sense of immersion in the scene. The human auditory system performs an analysis of sound, which enables the extraction of different information to recognize and localize sound sources. There are various aspects known to result in the differences of […]
Bone conduction has a big impact on the perception of the human being. Even though headphones are used by a billion of people around the world, it was yet not analyzed if the headphones excite structure-borne sound. Structure-borne sound they could cause bone conduction or cartilage conduction and interfere with the perception of the user. […]
From October 2019 to March 2020, I worked as an intern at Device Vodafone GTM Department in Düsseldorf Huawei. Huawei Technologies Co., Ltd., whose headquarter is located in Shen Zhen China, is a multinational tech-communication company that provides telecommunications equipment and sales of consumer electronics products including smartphones. My responsibilities are mainly as a Test […]
In this thesis, the mutual information and interaction between different objective distance metrics for HRTF comparison were analyzed and evaluated. For this purpose, tools such as correlation analysis, principal component analysis and factor analysis were used. The metrics were reduced to a smaller set of measures suitable for a listening experiment, covering both spatial and […]
Ultrasonic metal welding (USMW) is a kind of solid-state bonding technique for connecting similar or dissimilar metals using extremely fast frequency oscillations (ultrasonic frequencies). However, some details of vibration during the USMW are still unclear in this study field. In this work, 27 groups of measurements on the oscillation of the sonotrode and anvil vibrations […]
Anjan Chatterjee Penn Center of Neuraesthetics University of Pennsylvania Zoom-Meeting-ID: 967 2780 6048 Password: 747785 Direct link: https://rwth.zoom.us/j/96727806048?pwd=MjlOT1YrNk1ZUGZWTEV3ZU1BS0VGUT09 People in developed countries spend over 90% of their time in built environments. Yet, we know little about its pervasive and often hidden effects on our mental state and our brain. Despite growing interest in the neuroscience […]
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 […]
Akustik-Forschung