New publication on HRTFs in Journal of the Audio Engineering Society

27. April 2023 | von
Beitrag nicht mehr hervorheben

We are happy to announce that the article “A magnitude-based parametric model predicting the audibility of HRTF variation” by Shaima’a Doma, Cosima Ermert, and Janina Fels has been recently published in the Journal of the Audio Engineering Society (JAES) as part of the Special Issue on “Spatial Audio”. The study examines just noticeable differences in HRTFs with a focus on monaural cue changes. The probability of a listener detecting spectral changes is modelled as a function of three monaural error metrics, with linear model coefficients derived using Principal Component Analysis.

The open-access article can be viewed and downloaded in the AES E-Library.

Graphical abstract of the published paper.

Sacred Sound: The acoustic reconstruction of no longer existing spaces

24. April 2023 | von

The project Sacred Sound – Sacred Space, led by musicologist Prof. Stefan Morent of the University of Tübingen, deals with the acoustics of sacred spaces as they existed and were used many centuries ago. In cooperation with IHTA, this project uses simulations to reconstruct, for example, the acoustics of the abbey church of Cluny III in order to auralize the liturgical chants of the medieval monks. Cluny III existed between 1130 and 1790 and was the largest church in the world until the construction of St. Peter’s Basilica in Rome.

Based on the room acoustic simulations, medieval choir chants were performed and recorded in IHTA’s laboratories by the ensemble Ordo Virtutum. During the recordings, the singers were presented with the reflections of the virtually reconstructed church space in real time. In further steps of the project these recordings will be analyzed musicologically in order to investigate the influence of the architecture on the musical performance.

Parts of the project were recently documented by the SWR in a radio (116 min.) and a TV report (20 min; both in German language).

Thanks for everyone at IHTA who supported this project. Thanks also to the Visual Computing Institute for helping out with the aixCAVE system and to the company Sennheiser for providing microphones for the recording sessions!

Studienpreis der Deutschen Gesellschaft für Akustik 2023 an Julia Seitz

21. April 2023 | von

Im Rahmen der DAGA 2023 in Hamburg wurde der DEGA Studienpreis an M.Sc. Julia Seitz für Ihre herausragende Masterarbeit „Intentional Switching of Spatial Auditory Selective Attention in Preschool Children“ verliehen. Wir gratulieren!

DAGA 2023 in Hamburg – 49th Annual Conference on Acoustics

19. April 2023 | von

The 49th Annual Conference on Acoustics DAGA took place from March 6th to March 9th 2023, in Hamburg. The IHTA was represented there with 22 presentations and seven posters. The researchers presented their work in eleven different subject areas. This shows the broad range of topics the Institute covers in hearing technology and acoustics.

During the conference, the technical committees of the Deutsche Gesellschaft für Akustik e.V. (DEGA) met. In the technical committee Hörtechnik (Hearing Acoustics) Professor Janina Fels handed over the chair position after six years. Besides, the technical group Junge DEGA selected Simon Kersten as its new chairman. Jonas Heck, who was elected as deputy, supports him in this position.

After the dinner at the social evening on Wednesday, the IHTA Band performed two songs from their repertoire. On Thursday, a small group took the opportunity to participate in an excursion to the Elbphilharmonie. Not only the grand hall was visited, but also the rooftop was climbed.

DAGA 2023 – 49. Jahrestagung für Akustik

03. März 2023 | von

Again, IHTA is joining DAGA in Hamburg with interesting contributions from March, 6th, to March, 8th, 2023. We are delighted to invite to our presentations and posters. In total, IHTA members will be represented with 27 contributions (22 presentations and 5 posters):

Tuesday, March 7th
Jonas Heck,
Josep Llorca-Bofí, Aakriti Jain, Michael Vorländer
Text mining of audio-visual descriptors for concert halls Raumakustik 1 – Qualitätsfragen und Fallstudien A 14:00 Saal X 1-2
Lukas Vollmer, Elisabeta Balla, Björn Kampa, Janina Fels The Auditory Mismatch Negativity as an EEG-derived Measure of Predictive Coding Psychoakustik 14:20 Saal X 7-8
Lukas Aspöck, Michael Vorländer,
Anne Heimes,  Andreas Herweg, Olivier Dazel
An online course about acoustic simulations and auralization Lehre der Akustik 15:00 Saal Y 4
Shaimaa Doma,
Cosima Ermert, Janina Fels
On the monaural contribution to HRTF discrimination Perceptual Optimization of Dynamic Binaural Rendering 2 16:40 Saal Y 9
Lara Stürenburg, Hark Braren, Lukas Aspöck, Janina Fels Akustische Vermessung einer Wärmepumpe für Hörexperimente und Simulationen Strömungsakustik in der Energiewende 17:20 Saal X 9-10
Wednesday, March 8th
Marco Berzborn, Michael Vorländer Analytic Model Based Analysis of Modal Sound Field Decay Raumakustik 2 – Messung und Simulation A 09:00 Saal X 1-2
Thomas Deutsch, Janina Fels Evaluating Models for the Simulation of Cochlear Hearing Loss Audiologische Akustik 3 – Charakterisierung des Hörsystems 10:00 Saal Y 5
Pascal Palenda,
Michael Kohnen, Michael Vorländer
Influence of Position Mismatch on the Perception of Early Reflections of One’s Own Voice Virtuelle Akustik 1 10:40 Saal X 11-12
Karin Loh, Edina Fintor, Sophie Nolden, Janina Fels Comparing Children’s and Adults’ Intentional Switching of Auditory Selective Attention in Spatial and Noisy Acoustic Environments Psychoakustik 14:00 Saal X 7-8
Julia Seitz, Karin Loh, Sophie Nolden, Janina Fels Investigating Intentional Switching of Spatial Auditory Selective Attention in an Experiment with Preschool Children Psychoakustik 14:20 Saal X 7-8
Hark Braren, Janina Fels Individualized Head-related Transfer Functions for Children Virtuelle Akustik 3 16:40 Saal X 11-12
Mark Müller-Giebeler, Michael Vorländer Präzise Modellierung diffuser Schallfelder zur inversen Bestimmung akustischer Materialparameter Raumakustik 2 – Messung und Simulation B 17:40 Saal X 1-2
Anne Heimes,
Michael Vorländer
Measurement setup design for scattering patterns based on numerical simulations Raumakustik 2 – Messung und Simulation B 18:20 Saal X 1-2
Ingo Witew, Michael Vorländer Wie genau müssen Messpositionen für reproduzierbare Klarheitsmaß Messungen definiert werden? Raumakustik 2 – Messung und Simulation B Saal   X 1-2
Thursday,   March 9th
Chinthusa Mohanathasan, Jonathan Ehret, Cosima A. Ermert, Janina Fels,
Torsten W. Kuhle,
Sabine J. Schlittmeiers
Towards More Realistic Listening Research in Virtual Environments: The Effect of Spatial Position of Two Talkers in Conversations on Memory and Listening Effort SPP2236 – Auditory Cognition in Interactive Virtual Environments 1 09:20 Saal Y 5
Josep Llorca-Bofí,
Jonas Heck, Michael Vorländer
Reproducibility Exploration of Individual Vocabulary Profiles on Urban Soundscapes: Driescher Hof, Aachen Soundscape 09:40 Saal X 5-6
Cosima A. Ermert,
Jonathan Ehret,
Torsten W. Kuhlen,
Chinthusa Mohanathasan, Sabine J. Schlittmeier,
Janina Fels
Audio-visual content mismatches in the serial recall paradigm SPP2236 – Auditory Cognition in Interactive Virtual Environments 1 09:50 Saal Y 5
Chalotorn Möhlmann,
Simon Kersten,
Michael Vorländer
Finite Element Simulation of the Occlusion Effect in the Ear Canal Assisted Hearing – Testing, Models, Quality 1 10:00 Saal X 11-12
Lukas Aspöck, Stefan Morent, Michael Vorländer Simulated reverberation for choir recordings in virtual churches Raumakustik 10:20 Plenarsaal
Simon Kersten, Henning Taschke, Michael Vorländer Fluid Motion and Pressure Distribution in the Human Inner Ear during Bone Conduction Hearing Assisted Hearing – Testing, Models, Quality 1 10:20 Saal X 11-12
Carolin Breuer,
Stephan Fremerey, Larissa Leist, Maria Klatte,
Alexander Raake, Janina Fels
Investigating the Influence of Visual Distractors on the Voluntary Switchtig of Auditory Selective Attention in Virtual Reality SPP2236 – Auditory Cognition in Interactive Virtual Environments 1 10:40 Saal Y 5
Elie Abi Raad,
Jose Maria Gomez Belmonte, Michael Vorländer
Frequency response characterization of the welding process in Ultrasonic Metal Welding Structure-borne sound 16:00 Saa Y6
Wednesday, March 8th
Stefan Winkelmann,
Lara Stürenburg, Isabel S. Schiller, Janina Fels,
Sabine J. Schlittmeier
Subjektiver akustischer Komfort von Luftdurchlässen für Gebäudelüftungen Psychoakustik 15:40-16:20

Foyer Z, Posterinsel H

Marco Wegener, Jonas Heck, Josep Llorca-Bofí, Rouben Rehman, Christian Dreier, Philipp Schäfer, Michael Vorländer

Introducing an Unreal Engine toolkit for audio-visual perception studies in the virtual lab IHTApark Virtuelle Akustik
(Late Poster)

Foyer Z, Posterinsel Q

Thursday, March 9th
Frederike Rust, Karin Loh, Lukas Aspöck, Janina Fels Auswirkung akustischer Maßnahmen auf das Lärmempfinden im Klassenraum Raumakustik
(Late Poster)
11:00-11:40 Foyer Z, Posterinsel R
Jianliang Gao, Ingo Witew, Lukas Aspöck, Michael Vorländer, S. K. Tang Global sound field estimation of a theatre using an efficient multi-channel room acoustic measurement system Raumakustik
(Late Poster)

Foyer Z, Posterinsel R

Lili Pan, Jianliang Gao, Yuezhe Zhao An optimized procedure for random-incidence scattering coefficient measurement in 1:10 scaled reverberation room Raumakustik
(Late Poster)

Foyer Z, Posterinsel R

An overview of all contributions and updated information can be found in the DAGA 2023 App.

We are looking forward to seeing you at DAGA 2023!

BaLSaM project at IHTA invites to the kickoff event

10. Januar 2023 | von

The BaLSaM project investigates how traffic noise can be simulated and auralized, aiming to develop concepts to minimize road noise to create more pleasant environments. The goal is to make living spaces more attractive for people. For this purpose, the simulation focuses on the noise perception of humans so that the noise pollution is represented as accurately as possible. This simulation technique will later be used in planning traffic and living spaces. Additionally, an optimization study for exemplary scenarios will also be carried out during the project. If you are interested in this topic, we would like to invite you to the online BaLSaM kickoff event. You can register here: (DE) http://bit.ly/BaLSaMde

BaLSaM is funded within the mFUND framework.

The BaLSAM project partners are:

BaLSaM stands for “Braunkohlereviere als attraktive Lebensräume durch Straßengeräuschsimulation auf Basis bestehender Verkehrsdaten zur Minimierung von Lärm” and more information on the project can be found here: https://www.ika.rwth-aachen.de/de/pressemitteilungen/4140-attraktive-lebensräume-fürs-braunkohlerevier-–-projekt-balsam-hilft,-belastung-durch-straßenlärm-zu-minimieren.html

DAGA 2023 Travel Grants

04. November 2022 | von

Die Gesellschaft für Technische Akustik (GfTA e.V.) möchte Studierende des IHTAs unterstützen an der kommenden Jahrestagung für Akustik (DAGA 2023) teilzunehmen. Diese findet vom 6. bis zum 9. März 2022 in Hamburg statt und bietet eine sehr gute Möglichkeit, erste Erfahrungen bei wissenschaftlichen Konferenzen zu sammeln.

Die GfTA fördert in diesem Jahr bis zu drei Studierende durch einen Reisezuschuss (Travel grant) in Höhe von jeweils 250€. Kandidat*innen müssen keinen wissenschaftlichen Beitrag bei der Konferenz einreichen, sollten aber zuvor noch keine DAGA-Konferenz besucht haben und an einer Lehrveranstaltung am IHTA teilgenommen haben.

Um Dich für den Travel grant zu bewerben, schreibe eine Email an Lukas Aspöck und erkläre in ein oder zwei Sätzen, warum Du motiviert bist an einer Akustik-Konferenz teilzunehmen. Die Deadline für Bewerbungen ist der 2.12.2022.

International Congress on Acoustics ICA 2022

03. November 2022 | von

The Institute for Hearing Technology and Acoustics looks back on a very enjoyable and successful 24th International Congress on Acoustics ICA 2022 in Gyeongju, South Korea. IHTA was present with a total of 10 delegates and actively contributed to the program with two theme organizers, five special session organizers, 10 oral presentations, and one plenary lecture. The conference was an excellent event to meet the international acoustic community in real life again.

The full proceedings of the conference are available for download on the ICA 2022 website.

IHTA at the BauSIM conference in Weimar

22. September 2022 | von

From the 20th to the 22nd September 2022, the BauSIM conference took place. The scientific core topic of the conference is traditionally the energetic simulation in the building sector and offers an ideal discussion forum for experts from science and industry for mutual exchange. The conference is organized by the and IBSPA Germany-Austria, member of the International Building and Performance Simulation Association (IBPSA) This year’s conference introduced a new session on acoustic simulation topics, and our institute was present.

In particular, our Junior Principal Investigator Dr. Josep Llorca-Bofí, from the PAAD group was invited as key-note speaker, talking about The city – A machine for noise? Virtual acoustics in architectural design research. Together with our PhD student M. Sc. Jonas Heck and  Professor Michael Vorländer, the following research paper was presented: 3D photogrammetry for auralization – An approach for geometry simplification and material categorization.


junge DEGA Workshop 2022 in Stuttgart

12. September 2022 | von

From 2nd to 4th September 2022, after a three-years break due to the Covid-19 pandemic, the “junge DEGA Herbstworkshop” took place in Stuttgart, like the DAGA conference earlier this year. Junge DEGA is a sub-group of the German Acoustical Society with the mission to connect students, PhDs and young professionals in the domain of acoustics. It organizes special sessions and panel discussions during the Annual German Conference on Acoustics (DAGA), providing information on research funding opportunities and job entry. Furthermore, junge DEGA offers a mentoring program with active participation from industry and academia.

Two PhD students of the Institute for Hearing Technology and Acoustics, Simon Kersten and Jonas Heck, as well as Nils Rummler, recently graduated bachelor student, participated in this year’s workshop. The program started with visits at the Fraunhofer Institute for Building Physics IBP and the Center for Building Physics (ZfB, Hochschule für Technik Stuttgart). Furthermore, it consisted of short presentations given by the participants, a plenary meeting of the junge DEGA group to plan the following year’s activities and a guided visit of the new main station construction site (known as Stuttgart 21) with a focus on noise and vibration control. The weekend was concluded with a hands-on workshop on building a loudspeaker from residual materials and competing for the highest sound pressure level.

Pictures from the workshop can be found in the gallery below.


Inter-noise 2022 in Glasgow

08. September 2022 | von

This year’s inter-noise conference took place from August 21st to 24th in Glasgow, Scotland. More than 1000 delegates participated in this conference and presented interesting research in the field of acoustics and noise. Highlights of the conference included key note talks by Lily Wang (University of Nebraska–Lincoln) on indoor acoustic conditions and by the Salford Group (Andy Moorhouse, Andy Elliott and Josh Meggitt) on virtual acoustic prototypes.

Four researchers of the Institute for Hearing Technology and Acoustics travelled to the conference and presented the following research papers:

The full conference proceedings are also available for download here.

The interesting scientific program was accompanied by an entertaining social program as well as various early career events, which helped many of the younger participants to connect with each other. The International Institute of Noise Control Engineering (i-ince) also supported young researchers by providing travel grants, one of which was received by Elie Abi Raad. Congratulations, Elie, to this grant.

Pictures from the conference including the grant ceremony can be found in the gallery below.

IHTA at the POSTER 2022 Conference

04. September 2022 | von

After a break of three years due to the pandemic, this year in May, the 26th International Student Conference on Electrical Engineering POSTER 2022 was held in Prague, Czech Republic. This annual event in Czech’s capital city is an excellent opportunity for undergraduate and postgraduate students to gain first experiences at an international conference and strengthens the relationship between CTU Prague and RWTH Aachen University.

Three Phd students of the Institute for Hearing Technology and Acoustics presented scientific work in Prague:

  • Anne Heimes: Virtual reality environments for soundscape research
  • Carolin Reimers: Investigating the Auditory Selective Attention Switch in Virtual Reality
  • Lukas Vollmer: Evaluating Spatial Audio for Hearing Aid Applications

We are happy to report that the work by Anne Heimes was selected by a jury as the best paper in the category Informatics and Cybernetics. Congratulations to Anne for this award!

Pictures of the event can be found on the conference’s website.

Verabschiedung von Herrn Uwe Schlömer

08. August 2022 | von

Nach einer fast 50-jährigen Dienstzeit ist am 1. August 2022 der Leiter der mechanischen Werkstatt, Uwe Schlömer, in den wohlverdienten Ruhestand gegangen. Zur Verabschiedung wurde, entsprechend der Tradition der Doktorhüte, diesmal ein „Meisterhut“ überreicht, begleitet von einem Buch mit Grußworten aktueller sowie ehemaliger Mitarbeiter*innen und Anekdoten aus der langjährigen Dienstzeit.

Das IHTA bedankt sich auch an dieser Stelle nochmal für die hervorragende, immer verlässliche Arbeit von Uwe Schlömer und wünscht alles Gute für den Ruhestand.

Die mechanische Werkstatt des Instituts wird nun von Marc Eiker geleitet.

Early Career Presenter Award at the 182nd ASA Meeting

23. Juni 2022 | von

The 182nd Meeting of the Acoustical Society of America (ASA) was held in Denver, Colorado, from 23- 27 May 2022. At the conference, our PhD student Simon Kersten was honored with the Early Career Presenter Award by the Computational Acoustics Technical Committee of the ASA for his presentation on “Influence of the Model Parameters for the Finite Element Simulation of Bone Conduction in the Human Head”.

In this work, the influence of the various material parameters that are to be determined for finite-element models of human heads in bone conduction research was illustrated using a simple ellipsoid model. This research is part of the CRC 1330 HAPPAA funded by the Deutsche Forschungsgemeinschaft (DFG).

Congratulations to Simon for this award!


Promotionsprüfung Dipl.-Ing. Jonas Stienen

21. Juni 2022 | von

Am 3. Juni 2022 hat Herr Jonas Stienen seine mündliche Promotionsprüfung erfolgreich abgeschlossen.

Herr Stienen promovierte über das Thema:

„Real-time auralisation of outdoor sound propagation“

Doktorhut- und Doktortape-Übergabe

Das IHTA gratuliert sehr herzlich!

Abstract der Doktorarbeit:

Auralisation describes the process of generating and presenting audible sound using computer programs and audio hardware. Since the result is perceived naturally by the human’s auditory system, a demonstration by means of auralisation is easily comprehensible and does neither require background knowledge nor expertise. Producing auralisation under real-time constraints increases the implementation demands significantly. Real-time auralisation is required in applications that respond to user interaction, for example, in interactive Virtual Reality (VR) environments. Dynamically moving sound sources and receivers evoke a change in the perceived sound, and the corresponding result must be provided as quickly as possible. A feeling of immersion can be created if the response time of the system does not exceed perceptual thresholds and thus enables a plausible scene presentation. To achieve this emotional state, real-time auralisation must comply with the expected physical behaviour.

The realisation of a real-time auralisation application for outdoor environments represents a promising addition to current noise assessment procedures. It also delivers the foundation for the auditory modality in outdoor VR scenarios, which can server as as an audio-video tool for perception-related scientific investigations.

In the past, auralisation has gained much attention in room acoustics. An attempt to transfer the established concepts and approaches to outdoor environments reveals two systemic deficiencies.

Firstly, room acoustic simulations are commonly based on Geometrical Acoustics (GA), which determines reflected sound rapidly and with high accuracy, but struggles to incorporate diffracted sound. In most urban settings, however, the transmission of sound from a noise source to a receiver contains a significant contribution of both reflected and diffracted components. Furthermore, dynamic virtual environments are time-variant. Traditional realisations often neglect this characteristic, treating an acoustic environment as temporarily static on a frame-by-frame basis. Adaption to dynamic events is implemented by transition of sequences of time-invariant simulations, which is contradictory to the highly dynamic nature of outdoor scenarios.

To address these two misconceptions, a real-time auralisation system is suggested that attaches increased importance to fast geometric diffraction simulations and is based on an audio rendering network that reflects the time-variant nature of dynamic outdoor sound propagation.

Das IHTA bei der DAGA Stuttgart 2022

18. März 2022 | von

Nach dreijähriger, pandemiebedingter Pause fährt das Institut für Hörtechnik und Akustik wieder zur DAGA Tagung, die dieses Mal in Stuttgart stattfindet.

Hier eine Übersicht der wissenschaftlichen Beiträge (22.3.2022 – 24.3.2022):




 Wann?  Erstautor*in  Titel  Raum  Sitzung
14:00 Uhr
Lukas Aspöck Configuration of a real-time auralization framework for complex scenes 7-01 Virtuelle Akustik für dynamische Szenen: Methoden und experimentelle Anwendungen 1
14:20 Uhr
Pascal Palenda Open-Source Simulation Scheduling Framework for Real-Time Auralisation 7-01 Virtuelle Akustik für dynamische Szenen: Methoden und experimentelle Anwendungen 1
14:20 Uhr
Simon Kersten Finite Element Simulation of Bone Conduction in the Human Head: The Inner Ear Component 9-0.267 Physiologische Akustik
14:20 Uhr
Nils Rummler Analysis of Multi-Exponential Decay Constant Estimation Methods 47-03 Messung der Schallabsorption 1
14:40 Uhr
Christian Dreier Inverse modelling of vehicle pass-by noise for auralizations 7-01 Virtuelle Akustik für dynamische Szenen: Methoden und experimentelle Anwendungen 1
14:40 Uhr
Masoumeh Salehi Ersatzschaltbildmodellierung von Knochenschall 9 0.267 Physiologische Akustik
15:00 Uhr
Mark Müller-Giebeler Neural Network Based In-situ Method to Determine Surface Impedance and Absorption Coefficient of Porous Materials 47-03 Messung der Schallabsorption 1
15:20 Uhr
Roberto Campos Ruiz Dynamic Road Noise Mapping Prediction Using Machine Learning 9-0208 Geräuschbeurteilung
17:20 Uhr
Elie Abi Raad On using machine learning in Ultrasonic Metal Welding 57-06 AI-based methods for audio analysis and knowledge extraction 2
09:40 Uhr
Thomas Deutsch An Assessment of Higher-Order Ambisonics Reproduction in the Context of Spatial Release from Masking 9-01 Psychoakustik 3
14:00 Uhr
Michael Kohnen SAQI comparison of CTC, Ambisonics and VBAP 7-01 Virtuelle Akustik 2
15:20 Uhr
Jonas Heck Ambient Sounds in Auralization – Calibration Method for Spherical Microphones 7-01 Virtuelle Akustik 2
17:00 Uhr
Lukas Vollmer Stimulus Onset Asynchronies in Audio-visual Serial Recall Performance 9-01 Psychoakustik 5
08:40 Uhr
Jamilla Balint The methodology matrix to investigate evaluation methods in auditory cognition in interactive virtual environments 9-0208 SPP 2236 AUDICTIVE – Auditory Cognition in Interactive Virtual Environments 1
09:00 Uhr
Hark Braren On the Influence of Knee Reflections in HRTF Measurements 47-03 Binauraltechnik
09:00 Uhr
Ingo Witew Zur Unsicherheit von Raumimpulsantwortmessungen 47-01 Raumakustik 1
09:40 Uhr
Josep Llorca Bofi Unfolding urban vocabularies – Audio-visual description of public spaces and their connections to urban analysis 47-05 Soundscape
10:20 Uhr
Carolin Reimers Investigating Different Cueing Methods for Auditory Selective Attention in Virtual Reality 9-0208 SPP 2236 AUDICTIVE – Auditory Cognition in Interactive Virtual Environments 1
10:40 Uhr
Philipp Schäfer Auralization with Linked Atmospheric and Urban Noise Propagation Models 9-01 Lärm – Schifffahrt und Flugverkehr 2
14:00 Uhr
Cosima Ermert Examining the Influence of Varying Audio Reproduction Methods on Verbal Short-Term Memory 9-0208 SPP 2236 AUDICTIVE – Auditory Cognition in Interactive Virtual Environments 2
14:20 Uhr
Anne Heimes Numerical simulation of scattering patterns of a sineshaped surface 47-01 Raumakustik 2
14:20 Uhr
Marco Berzborn Spatio-temporal analysis of anisotropic reverberation 47-05 Rendering, Processing, and Perception of Diffuse Reverberation




Wann? Erstautor*in Titel Raum Sitzung
15:40 Uhr
Karin Loh Challenges and methods to design a dual-task experiment in spatial auditory environments for young children (3-6 years old) 9-01, J Psychoakustik (Poster 1)
15:40 Uhr
Lara Stürenburg Aeroacoustic Performance of Air Diffusers and their Psychoacoustic Evaluation 47-02, A Strömungsakustik (Poster)
11:00 Uhr
Shaima’a Doma Interrelation Analysis of Distance Metrics for Head-Related Transfer Functions 47-03, A Augmented Acoustic Reality (Poster)



Promotionsprüfung Muhammad Imran, M.Sc.

04. Februar 2022 | von

Am 4. Februar 2022 hat Herr Muhammad Imran seine mündliche Promotionsprüfung erfolgreich abgeschlossen.

Herr Muhammad Imran promovierte über das Thema:

„Virtual Building Acoustics – Auralization with contextual and Interactive Features“


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 dwellings and/or might be from outdoor moving transient sound sources. Methods are available for auralization of sound insulation between connected rooms in compliance with the standardized data formats of sound insulation metrics and building structural geometries. However, there still exist certain challenges to be addressed to construct the transfer functions between noise sources and receiver room for indoor situations as well as for the outdoor moving sound sources and to make these sources audible through audio-visual virtual reality systems in real time and interactively. These challenges are due to certain simplifications which are implicit in the formulation on which the sound insulation prediction models are based, such as, diffuse field assumptions, neglecting source characteristics, and source and receiver room acoustics.

This thesis focuses on addressing the present challenges in the traditional sound insulation rendering techniques and establishing an interface between psychoacoustic research and building acoustics in dwellings (especially airborne sound insulation) integrated with audio-visual virtual reality environments. From the technical perspective, improvements are made in sound insulation prediction methods, and corresponding filter construction and rendering techniques for auralization. In the first place, the building elements are considered as multitude of secondary sources rather than taking them as point source radiators and the bending wave patterns are addressed in order to be able to properly construct the transfer functions from source to the receiver room. Secondly, the room acoustical simulations are carried out for both source and receiving rooms to generate transfer functions from source to the source room walls and from radiating receiving room walls to the listener, so that the geometries and absorption might be fit to the properties desired by the user for the spatial impression of the listening rooms. In addition, the transfer functions from radiating walls of the receiving room to listener are designed in such a way that not only indoor sources are handled nevertheless the outdoor moving sources are also addressed.

Some important conditions are associated with virtual building acoustics auralization research platform for advanced studies of noise effects in dwellings which are addressed. The audio files, generally, used in listening tests are arbitrarily manipulated by audio samples without the background of a physical model of the built environments. They must comply with the standardized data formats of sound reduction indices (level differences) and/or sound transmission coefficients. Other data related to building structure such as geometry shall be strictly connected to the architectural design, the building materials and constructions. Otherwise the conclusions of the psychoacoustic experiments have no direct correlation with the architectural design, especially when presented through virtual environments. To achieve this, the auralization framework is extended toward real-time interactive audio-visual technology, i.e. VR technology, in order to be able to introduce more realism and, hence, contextual features into psychoacoustic experiments. The building acoustics framework is validated by taking indoor and outdoor example case studies. Listening experiments close to real-life situations are carried out by using this framework to show that this framework can be used as an alternate to design new test paradigms which help to better analyse and interpret the noise impact in building situations depending on the actual activity such as working, learning, and rest.

Das IHTA gratuliert sehr herzlich!!

Doctoral exam Muhammad Imran, Examination committee: Prof. Dr. Kay Hameyer, Prof. Dr. Michael Vorländer, Prof. Dr. Edwin Reynders, Prof. Dr. Peter Jax

Promotionsprüfung Dipl.-Ing. Ingo Witew

02. Februar 2022 | von

Am 21. Januar 2022 hat Herr Ingo Witew seine mündliche Promotionsprüfung erfolgreich abgeschlossen.

Herr Witew promovierte über das Thema:

„Measurements in room acoustics – Uncertainties and influence of the measurement position“


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 application of these rules is not yet widespread. On the one hand, this is due to the fact that well established 2-CH-FFT correlation techniques rely on a complex principle, which is not covered by the classical guide. In addition, the effect of input variables on a measurement can only be determined in individual cases after considerable effort. An example are fluctuations of room acoustic quantities over smallest distances between measurement locations in concert halls. This change of the sound field over the location is sometimes considerable and can only be predicted in relatively simple boundary value problems. This raises the question of the validity and interpretability of room acoustics measurements.

The goal of this thesis is to provide a GUM-compliant discussion of uncertainties in measuring room acoustic single-number quantities. This starts with a structured search of variables that potentially influence the measurement of room impulse responses. In a second step, this uncertainty is propagated through the algorithm for determining room acoustic single-number quantities.

Further emphasis is placed on the investigation of spatial fluctuations of the sound field in auditoria. The influence of an uncertain measurement position on the overall measurement uncertainty is discussed. To reach general conclusions, the relation between changes in the measurement location and the corresponding changes in room acoustics quantities is investigated empirically in extensive measurement series. To this purpose, a measurement apparatus was designed that allows automatic, high-resolution sampling of sound fields over large areas. The collected data sets the foundation to propagate the uncertainty using a Monte Carlo method.

This study shows how precisely a measurement position must be defined to ensure a given uncertainty of room acoustical single-number quantities. The presented methods form a foundation that can be flexibly extended in future investigations to include additional influences on the measurement uncertainty.

Das IHTA gratuliert sehr herzlich!!

Fotos: Josep Llorca-Bofí

Promotionsprüfung Dipl.-Ing. Florian Pausch

03. Dezember 2021 | von

Am 26. November 2021 hat Herr Florian Johannes Pausch seine mündliche Promotionsprüfung erfolgreich abgeschlossen.

Herr Pausch promovierte über das Thema: „Spatial audio reproduction for hearing aid research: System design, evaluation and application“


Listening, understanding and communicating are essential skills for social interaction in everyday life. Hearing loss (HL) may have severe consequences on these skills and affect individuals by hindering language development, learning success and participation in social life already at an early age. Depending on the individual predisposition, those affected are likely to withdraw from socialisation processes and sometimes suffer from compromised mental and general health. However, these consequences are not limited to children but also apply to adults and elderly people, especially those who refuse to acknowledge their HL and appropriate treatment, leading to an increased risk of apathy and depression, as well as memory problems and dementia. Assistive listening devices, such as hearing aids (HAs), represent an effective technical intervention tool capable of partially restoring impaired hearing and helping to overcome the aforementioned consequences of HL. Despite using the latest technology, individuals fitted with HAs often complain about poor performance of their devices, particularly in demanding indoor communication settings with unfavourable room acoustics. To some extent, these performance shortcomings can be attributed to limitations of HA algorithms, which are often designed and tested using simplified laboratory scenarios that may differ substantially from complex real-world situations. This thesis contributes to bridging this gap by exploring the advantages and flexibility of virtual acoustic environments (VAEs) reproduced by state-of-the-art spatial audio reproduction methods adapted for HA research. In order to further approach the overarching goal of ecological validity, the system design has been complemented by real-time implementations and room acoustic simulations, allowing to include listener movements via motion tracking and simulate plausible indoor environments, respectively. The systems are comparatively evaluated based on measurements and perceptual experiments with normal-hearing individuals, demonstrating their applicability in experiments involving normal-hearing participants and participants with HL.  

Doctoral exam Florian Pausch, Prüfungskommission: Zweitgutachterin Prof. Dr. Astrid van Wieringen (KU Leuven), Prof. Dr. Andrei Vescan, Prof. Dr. Dirk Uwe Sauer, Prof. Dr. Janina Fels


Doktorprüfung Florian Pausch. Prof. Dr.-Ing. Janina Fels und Dipl.-Ing. Florian Pausch. Foto: Mark Müller-Giebeler


Das IHTA gratuliert sehr herzlich!!

DEGA Symposium 14 – Interactive Auralization for Spatial Planning

16. November 2021 | von

The Institute for Hearing Technology and Acoustics demonstrated its auralization tools in the 14th DEGA Symposium – „Interaktive Auralisierung für die Planung von Räumen“ in Berlin, during the 12th and 13th November 2021, under the title:

Auralization of an urban scene: Multimodal presentation of aircraft noise with atmospheric damping and vehicle sound propagation with parametric synthetic sound sources.

Christian Dreier, Josep Llorca-Bofi, Jonas Heck, Philipp Schäfer, Anne Heimes, Luciana Alves, Jonas Kempin and Michael Vorländer.

An audio-visual live demonstration was presented with graphics based on Unreal Engine 4. The spatial audio was rendered using Virtual Acoustics (VA) making use of different simulation frameworks developed at IHTA. A similar example can be experienced in this 360º video.