Stephan Preihs

Stephan Preihs
Leibniz Universität Hannover · Institut für Kommunikationstechnik

Dr.-Ing.

About

46
Publications
3,725
Reads
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131
Citations
Citations since 2017
38 Research Items
113 Citations
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Introduction
Stephan Preihs currently works at the Institut für Kommunikationstechnik, Leibniz Universität Hannover. Stephan does research in Signalprocessing for audio and acoustics. The most recent publication is 'Psychoacoustic optimization of a robust feedback active noise controller for headphones'.

Publications

Publications (46)
Preprint
Due to the distance-dependent characteristics of near-field Head-Related Transfer Functions (HRTFs), their acquisition procedure is much more complex than that of far-field HRTFs, which is already rather tedious. Recently, an approach to efficiently measure near-field HRTFs with a high distance resolution, using a continuously moving sound source a...
Conference Paper
This paper presents an Extended Reality Environment (XRE) for Immersive Networked Music Performances (INMP) called Immersive Room ExtensioN Environment (IRENE). The design of the IRENE-system includes a position-dependent visual and auditory representation of the users within a Virtual Room Extension (VRE). Early reflections and diffuse reverberati...
Article
Full-text available
Although virtual reality, video entertainment, and computer games are dependent on the three-dimensional reproduction of sound (including front, rear, and height channels), it remains unclear whether 3D-audio formats actually intensify the emotional listening experience. There is currently no valid inventory for the objective measurement of immersi...
Conference Paper
Full-text available
Near-field Head-Related Transfer Functions (HRTFs) depend on both source direction (azimuth/elevation) and distance. The acquisition procedure for near-field HRTF data on a dense spatial grid is time-consuming and prone to measurement errors. Therefore, existing databases only cover a few discrete source distances. Coming from the fact that continu...
Article
Full-text available
In internet experiments on auditory perception, playback devices may be a confounding variable reducing internal validity. A procedure to remotely test multiple characteristics of playback devices does not currently exist. Thus, the main goals of this study were to (i) develop and (ii) evaluate a comprehensive, efficient, and easy-to-handle test pr...
Conference Paper
An acoustic transfer function dataset is presented that contains the influence on the head-related transfer function (HRTF) of headphones worn by a dummy-head. The database contains the HRTFs of a KEMAR dummy head in the horizontal plane with an angular resolution of 5 degrees, as well as the perturbed HRTFs of 34 different headphones of all types...
Conference Paper
Full-text available
The frequency-domain adaptive Kalman filter (FDAKF) is a popular choice for multichannel acoustic echo cancellation (AEC) due to its good initial convergence and robustness to double-talk. However, without additional measures its reconvergence and tracking capabilities are known to be suboptimal. Previous studies have particularly focused on abrupt...
Preprint
Full-text available
Although virtual reality, video entertainment, and computer games are dependent on the three-dimensional reproduction of sound (including front, rear, and height channels), it remains unclear whether 3D-audio formats actually intensify the emotional listening experience. There is currently no valid inventory for the objective measurement of immersi...
Article
Full-text available
Broadband time-invariant feedback (FB) controllers can be designed to cancel unwanted noise components with a single error microphone on each side of a headphone. This paper presents an optimization routine based on the genetic algorithm (GA) approach to set the boundaries for a mixed-sensitivity H∞ controller. The FB controllers are designed with...
Article
Modern communication networks enable audiovisual interaction between geographically distant locations in near real time, leading to an increasing interest in networked music performance (NMP) and growing availability of related tools and applications. An important point of such distributed performances is the nature of interaction between the perfo...
Conference Paper
Full-text available
Soundscape, as defined in ISO 12913-1, is understood as a perceptual construct whose evaluation is recommended by a triangulation between the components person, context and acoustic environment. With the increase of information about each of these components, the description of a specific soundscape gains validity. This paper is motivated by this a...
Conference Paper
Full-text available
In near-field HRTF measurements, where the sound source that is used for emanating the excitation signal is placed in the proximal range (<1 m) of the subject’s or the KEMAR’s head, care must be taken when deciding what kind of sound source to use. The ideal sound source should be infinitesimally small and omnidirectional, i.e. it should be a point...
Conference Paper
Acoustic impedance tubes are commonly used to measure a test specimen's acoustic characteristics, such as reflection factor, absorption coefficient, or acoustic impedance, in combination with one or two condenser measurement microphones according to associated standards. In the development process of an impedance tube, the microphone diaphragm's si...
Article
Within the scope of the interdisciplinary project WEA-Akzeptanz, measurements of the sound emission of wind turbines were carried out at the Leibniz University Hannover. Due to the environment there are interfering components (e. g. traffic, birdsong, wind, rain, ...) in the recorded signals. Depending on the subsequent signal processing and analys...
Preprint
Training convolutional recurrent neural networks (CRNNs) on first-order Ambisonics signals is a well-known approach for estimating the direction of speech/sound arrival. In this work, we investigate whether increasing the order of Ambisonics signals up to the fourth order further improves the estimation performance of CRNNs. While our results on da...
Conference Paper
Distributed performances of musicians at distant locations are recently enjoying increasing interest due to the availability of larger bandwidths in network and mobile communication. Modern spatial audio capturing and multichannel reproduction techniques could make these performances an immersive and more realistic experience. But a bidirectional a...
Conference Paper
The research project �LIPS� (Live Interactive PMSE Services 1)� aims at enabling tele-conferencing and distributed music performances in a most natural and im-mersive way. To provide a most plausible acoustic environment for the distributed interacting participants the Institut für Kommunikationstechnik (IKT) is working on Immersively Connected Roo...
Conference Paper
The New York University and the Leibniz University Hannover are working on future immersive Networked Music Performances. One of the biggest challenges of audio data transmission over IP-based networks is latency, which can affect the interplay of the participants. In this contribution, two metronomes, utilizing the Global Positioning System to gen...
Conference Paper
Several rhythmic experiments with pairs drawn from a group of 23 subjects were performed to investigate the effect of a global metronome on the ensemble accuracy in Networked Music Performance (NMP). Artificial delays up to 91 ms were inserted into the audio transmission between the subjects. To investigate the dependencies between delay times, ens...
Conference Paper
Closed-back headphones usually have a higher acoustic impedance if compared to open-back headphones. An increased acoustic impedance of headphones results in an increased sound pressure level at low frequencies while speaking. This causes an unnatural perception of the person’s own voice and is called the occlusion effect. This study investigates w...
Conference Paper
This paper discusses the impact of Active Noise Cancellation (ANC) functionality on the acoustic impedance of headphones. We therefore show a method for the qualitative analysis of ANC headphone systems considering the occlusion effect (OE) and the “openness” of headphones. A total of 11 different headphones were measured on an acoustic impedance t...
Conference Paper
Spatial sound field recordings and subsequent reproduction became more popular recently due to the availability of high quality microphone arrays, improved computational abilities and sophisticated spatial audio reproduction technologies. In the context of soundscape evaluation, valid reproducibility of the captured sound fields plays an important...
Conference Paper
Full-text available
Im Rahmen des vom Bundesministerium für Wirtschaft und Energie geförderten Projekts "LIPS-Live Interactive PMSE Services" arbeiten die Projektpartner aus Industrie und Forschung an einer immersiven audiovi-suellen Verbindung zwischen entfernten Räumlichkeiten, die es Menschen erlaubt in einer möglichst natürlichen Art und Weise miteinander kommuniz...
Conference Paper
Full-text available
Within the project "Live Interactive PMSE Services" (LIPS) the Institute of Communication Technology (IKT) is investigating novel interactive concepts for the immersive audiovisual linking of live events at different geographic locations. The project has the aim to develop solutions to improve access and participation of rural areas in the creative...
Conference Paper
The emerging production of 3D audio content results in new challenges regarding the optimization of the production processes for VR/AR applications as well as for 3D music or film productions. This contribution presents a novel approach of a virtual audiovisual environment for 3D audio production based on a real listening room with different loudsp...
Conference Paper
The equalization of room acoustic influences on the sound transmission from a source (loudspeaker) to a receiver (listener/microphone) is a well known problem in audio engineering and academia that led to various equalization methods. However, many highly effective approaches lack of either robustness, practicability or usability. This paper thus p...
Conference Paper
With the usage of future 4G+/5G technologies in wireless equipment for “Programme Making and Special Events” (PMSE) new innovative live services and applications are possible. In this paper our novel “Assistive Live Listening Service” is presented. The service provides individualized additional augmented audio content to every single listener at a...
Conference Paper
The study presented here investigates and compares three different methods regarding their suitability for determining the relative openness of circumaural and supraaural headphone types, namely: (1) the Pressure Division Ratio (PDR), (2) the Headphone Selection Criterion (HPC), and the Acoustic Impedance Curve (AIC). Measurements were conducted by...
Conference Paper
In the course of the project PMSE-xG an audience service for live events – the Assistive Live Listening Service – was developed. The service uses supplementary augmented audio content presented through transparent headphones to enhance the traditional audio playback of a PA loudspeaker system. Augmented audio content and ambient sound are temporall...
Conference Paper
Our novel audience service for live events uses supplementary audio content presented through transparent headphones to enhance the traditional audio playback of a PA loudspeaker system. The service requires to estimate the propagation delay of sound waves from the PA loudspeakers to the listener in order to individually delay the supplementary aud...
Conference Paper
This engineering brief presents the novel multichannel audio laboratory for immersive media applications of the Institut für Kommunikationstechnik (IKT) with its varying multichannel loudspeaker arrangements and acoustical transparent projection screens of nearly 270°. We address the construction process and setup of the laboratory called Immersive...
Conference Paper
Full-text available
In augmented reality audio applications a superposition of environmental sounds and supplementary audio content is used to create auditory enhancements for the listener in a broad range of use cases. In some use cases environmental sounds and supplementary content may be highly correlated, for example in audience services at live events, where a li...
Conference Paper
Full-text available
PMSE-xG is a research project studying 4G+/5G technologies and their usage in wireless equipment for "Programme Making and Special Events" (PMSE) applications. The PMSE-xG project has the vision of delivering important advancements in the creative industry ecosystem, focusing on audio and video applications as well as potential new audience service...
Conference Paper
This paper reveals the potential gain in audio quality that can be achieved by combining Spherical Logarithmic Quantization (SLQ) with advanced broadband error robust low delay audio coding based on ADPCM. We briefly summarize the basic properties and mechanisms of SLQ and the employed ADPCM scheme and show how they can be combined in a freely para...
Conference Paper
Composite rotor blades of wind turbines are subjected to high dynamic load. This load can cause damages which can accumulate over time to critical structural damage. A system detecting defects early and reliably helps to react fast and to avoid critical damage. Such a method will enable the wind turbine operator to increase operational safety and m...
Article
Full-text available
Structural health monitoring systems can help to improve safety and minimize the numerous economical burdens of wind turbines. To detect damage of rotor blades, several research projects focus on an acoustic emission approach. Acoustic emission stands for stress waves emitted by a damage process. For this approach components of the waves are measur...
Article
This paper is concerned with the comparison of filter bank design algorithms for use in audio coding applications with a very low coding delay of less than 1 ms. Different, methods for numerical optimization of low delay filter banks are analyzed and compared. In addition, the use of t wo designed filter banks in combination with a delay-free ADPCM...
Article
Full-text available
Combining the Molded Interconnect Device technology with the Laser Direct Structuring technology exhibits the potential of designing electrical and mechanical components on three-dimensional surfaces to increase functionality, level of integration and to reduce costs. When taking advantage of this technology especially in the design of RF devices,...
Conference Paper
The use of the molded interconnect device technology combined with the laser direct structuring technology exhibits the potential of designing electrical and mechanical components on three-dimensional surfaces to increase functionality, level of integration and to reduce costs. When taking advantage of these technologies especially in the design of...

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Projects

Projects (2)
Project
- Solutions to improve access and participation of rural areas in the creative, cultural and political operation of metropolitan areas (basic cultural services) and vice versa. - Development and demonstration of novel, smart services for the interactive and immersive linking of and to events of the CCI. - Introduction of smart, innovative services based on new technologies of event and production technology, taking advantage of technological convergence of production and distribution networks for live production and live distribution (e.g. participation in events via AV immersion). LIPS also provides solutions to enable people with disabilities who are unable to travel to a political or cultural event due to disability or illness to participate holistically and immersively. LIPS makes significant contributions to inclusion and participation. With the immersive participation in events in the city by participants from the countryside, and vice versa, the cultural attractiveness and effectiveness of rural areas is increased. http://www.lips-project.de/
Project
Within the project an interdisciplinary approach is adopted, which links physical sound generation and radiation with the psychoacoustic assesment at the place of immission. With the collaboration of the industry partner Senvion and several institutes of the Leibniz University Hannover an overall acoustic model is developed. The model includes sound generation on the rotor, on wind turbine components and on the nacelle, as well as sound propagation to the recipient under realistic atmospheric conditions. The overall model also considers the psychoacoustic annoyance assessment of the calculated sound immissions, which is particularly important for public acceptance. To validate the submodels and the overall model, extensive field tests are carried out under different environmental conditions. The influence of different operating conditions and appropriate measures for sound reduction are evaluated. In future, with the validated model, it will possible to obtain a psychoacoustic assesment and an acoustic simulation of the wind turbine at an early stage in the planning phase, taking into account the predicted sound emissions, sound propagation and sound preception. For further information about the project “WEA-Akzeptanz”, please visit the project homepage at www.wea-akzeptanz.uni-hannover.de.