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Akustik-Blog

Tan: Examining Inter-Individual Differences between Hearing-Aid-Related Transfer Functions

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Head-related transfer functions (HRTFs) describe the filter process of the incident sound caused by reflection, refraction, diffraction and interference with the ear for a random source position in space to one of both ears. Similarly, hearing aid-related transfer functions (HARTFs) describe the sound path to the built-in microphones of a hearing aid device, e.g., behind […]

Ji: Extending a paradigm on the intentional switching of auditory selective attention towards complex stimuli

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Auditory selective attention (ASA) refers to the mental ability to resist distractors and to focus on a specific sound in a complex acoustic environment. Revealing the factors that affect people’s ASA can help to improve student’s learning environment. Thus, studies have been conducted both in real life and virtual reality (VR) environments. This study aimed to make a […]

Akdag: Psychoacoustic Effects of Air Diffuser Noises at the Same Loudness Level

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

This study investigates the impact of air diffuser noise on human well-being, which is relevant due to its widespread use in residential and commercial buildings. The objective is to determine the types of air diffusers that produce the most pleasant noise by conducting a pairwise comparison listening experiment with 32 participants. Seven stimuli were recorded […]

Nugraheni: Numerical simulation and evaluation of scattering coefficients of building facades

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

The acoustic propagation of sound in the open field or in the interior can be calculated efficiently and in high quality by geometric simulation methods. However, for correct simulations, accurate surface parameters such as absorption and scattering coefficients are required. In this thesis, the scattering coefficient of different facades is simulated with established numerical methods. […]

Merten: Performance of short term memory under the influence of (a)synchronous audio visual speech stimuli

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Nowadays, more and more conversations are conducted via technical aids, such as computers or mobile phones. In technology, there can be connection or processing problems that lead to disturbances in playback. As a result, audio and video signals, for example, are time-delayed, which can be noticeable and disturbing. Since short-term memory is needed, especially in […]

Li: Short-term memory performance under audio-visual mismatch of lip-movements

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

In modern life, the proportion of computer-mediated conversations is gradually increasing, e.g., lectures via zoom, or virtual reality (VR). In real-life, information is perceived multi-modal: in addition to visual information, sound as auditory information is received and remembered along with coherent visual cues, such as lip-movement. However, due to the instability of the network in […]

Li: Geometry reduction of acoustic models

IHTA Seminarraum (60 Personen) Kopernikusstrasse 5, Aachen

Audio-visual experiences of modeled spaces play a key role when studying the human perception of the built environment, and the results should give us an intuitive sense of the real situation. Acoustic models need a low number of polygons in order to be simulated efficiently. It is at the same time important to retain acoustic […]

Schmitt: The influence of realistic background noise on auditory selective attention

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Every day we are exposed to background noise with a multitude of simultaneous noises from different origin, for example on the bus, at work, or at a party. Nevertheless, we can listen to specific sounds or voices out of this mixture due to our ability of auditory selective attention, which enables us to focus on […]

Fang: Validation of free-field sound scattering simulations

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

The scattering coefficient is a crucial parameter in acoustics, as it plays a significant role in characterizing the scattering of sound waves from surfaces and materials. In this study, we focus on the free-field simulation of the scattering coefficient. First, we validate the scattering coefficient against analytical solutions of standard surfaces, such as sine and […]

Ribas Durán: A Statistical Complexity Reduction to Assess Audiovisual Perception in Urban Environments

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Many public authorities strive for creating more livable cities in future. To better understand what parameters need to be optimized to achieve this, it is necessary to study how humans perceive urban spaces. A proposed technique to compare different environments is the Individual Vocabulary Profiling (IVP). This study investigates how people evaluate an urban environment […]

Schröder: Parameterstudie zur Laufzeit von Virtual Acoustics

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Die Berechnungszeit eines Audioblocks ist für Echtzeit-Auralisationen von entschei- dender Bedeutung, da sie die realisierbare Latenz nach unten begrenzt. Diese Arbeit untersucht die Auswirkung verschiedener Konfigurationsparameter auf die Laufzeit der Echtzeit-Auralisations-Software Virtual Acoustics (VA). Dazu werden theoretisch fun- dierte Tests implementiert, die die Laufzeitänderung durch Variation von Parametern und Szenekonfigurationen messen. Die gemessenen und erwarteten […]

Rust: The Effect of Implicit Pitch-to-digit Associations on Performance in a Verbal Serial Recall Task

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Abstract: In this thesis, the processing of verbal and tonal stimuli in the brain was investigated. It was assessed whether implicit pitch-to-digit as sociations influence performance in a verbal serial recall task. In the experiment, 28 participants had to remember visually presented nine digit-sequences in four different presentation conditions: when digits were only presented visually, […]

Zhang: Analysis of standard scattering coefficient measurements

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

The acoustic scattering of surfaces is very important in all aspects of room acoustics like in concert halls and reverberation rooms. The sound propagation can be calculated effectively and in high quality by geometrical simulation methods. Nevertheless, this requires reliable scattering coefficients. In this thesis, the random-incidence scattering coefficient will be measured after ISO 17497-1 […]

Käppel: Untersuchungen zu Wiedergabeverfahren für irreguläre Lautsprecherarrays im Nahfeld

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Ambisonics ist ein weitverbreitetes Audiowiedergabeformat zur lautsprecherbasierten Reproduktion räumlicher Schallfelder. Klassische Ambisonics-Decoder basieren auf der Annahme ebener Wellen. Damit eine Fernfeldnäherung ebener Wellen für die Lautsprecher zulässig ist, müssen diese ein Sampling der Kugel mit konstantem und ausreichend großem Abstand zum Hörer darstellen. Für die Realisierung eines Arrays in einer kleinen Hörkabine müssen die Lautsprecher […]

Braun: Subjektive und objektive Evaluierung der Akustik in Hörsälen der RWTH Aachen University

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Das Ziel der Arbeit war, den Zustand der Raumakustik in Hörsälen der RWTH Aachen University zu erfassen und die Daten zu evaluieren. Dazu wurden Messungen der Raumimpulsantwort in neun Hörsälen auf Basis der DIN EN ISO 3382-1 durchgeführt. Anhand der Impulsantwort wurden raumakustische Gütemaße berechnet, die für eine gute Sprachverständlichkeit wichtig sind. Zur Evaluierung wurde […]

Dürksen: Untersuchungen zur Höranstrengung bei Grundschulkindern in verschiedenen Lärmsituationen

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Kommunikation ist ein wichtiger Bestandteil der sozialen Interaktion im Alltag. Der kognitive Aufwand für das Verstehen und Verarbeiten von Sprache wird als Höranstrengung bezeichnet. Diese ist unter anderem abhängig von der Lärmumgebung und der verfügbaren kognitiven Kapazität. Wenn mehrere Aufgaben gleichzeitig zu bewältigen sind, müssen die begrenzten Ressourcen aufgeteilt werden. Beansprucht das Sprachverstehen mehr Verarbeitungsressourcen, […]

Dai: The Influence of Room Acoustics on Auditory Selective Attention in a Virtual Classroom

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

In this thesis the influence of room acoustics on auditory selective attention was examined. A hearing experiment in virtual realty was conducted with 16 normal hearing and normal seeing participants at the Institute for Hearing Technology and Acoustics, RWTH Aachen University. For the Experiment, three classroom scenarios representing no room acoustics, good room acoustics (T30=0.48s, […]

Kamps: Synthesis of aircraft sound emission for auralization

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

Aircraft sound emissions are often associated with health risks for humans. Consequently, reducing the noise levels has been a research goal for many years. However, a simple level reduction does not consider the impact that specific characteristics of aircraft sound might have on noise annoyance. This issue is addressed by the auralization of aircraft noise […]

Konrad: Numerical study of nonlinear factors in acoustic scale model measurements

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

This thesis focuses on investigating the effects of atmospheric attenuation when employing scale models, with the ultimate goal of improving their application in the study of noise in urban regions. While direct measurements within urban regions are feasible, they may encounter problems, such as noise. For those reasons, there has been a resurgence of interest […]

Kapidani: Supervised Learning for Modeling Reverberant Sound Fields

IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid) Kopernikusstr. 5, Aachen, Deutschland

This thesis focuses on learning a measuring method for the determination of the acoustic characteristics of porous materials within a reverberant room setting. Using a supervised learning approach, this research aims to estimate from sound field measurements in the industry standard Alpha Cabin, the most important material parameter that porous materials exhibit, namely the flow […]