Lukas Treybig M. Sc.

Wissenschaftlicher Mitarbeiter

Helmholtzbau, Raum H 3522
+49 3677 69-1132
lukas.treybig@tu-ilmenau.de

   

Literaturliste

Anzahl der Treffer: 11
Erstellt: Sun, 21 Jul 2024 20:48:56 +0200 in 0.0948 sec


Klein, Florian; Treybig, Lukas; Schneiderwind, Christian; Werner, Stephan; Sporer, Thomas
Just noticeable reverberation difference at varying loudness levels. - In: AES Europe 2023, (2023), S. 361-368

In order to successfully fuse virtual sound sources with the real acoustic environment, the acoustic properties of the real environment must be estimated and utilized for the synthesis of virtual sound sources. Often, just noticeable differences (JNDs) of room acoustic parameters are utilized to predict a good match between virtual and real acoustics. However, several studies in this domain have shown that existing JND values of room acoustic parameters are often not able to predict the perception of the listeners. This can have various reasons: Differences in first reflection patterns are barely measurable with classical acoustic parameters; Even if acoustic differences are above the JND, a plausible reproduction might still be possible; JNDs depend on various factors (such as sound signal, etc.) and existing studies do not cover all of them. The last factor is addressed in this research paper. A three-alternative forced (3AFC) choice test was conducted at four different loudness levels (75 dB(A), 65 dB(A), 55 dB(A), and 45 dB(A)) in a reverberation time range from 0.5 s to 0.8 s. A dependency of the loudness on the detectability of reverberation differences was found for the randomly interleaved presentation of loudness levels but not for sequential presentation. Individual hearing thresholds as well as expertise level significantly influence the JND of reverberation time.



Treybig, Lukas; Werner, Stephan; Klein, Florian; Amengual Garí, Sebastià V.
Robust reverberation time estimation for audio augmented reality applications. - In: AES Europe 2023, (2023), S. 47-55

The paper presents an alternative approach for estimating reverberation time from measurements in real rooms when the requirements of the standard DIN EN ISO 3382-1/2 for the characteristics of the sound source, receiver, and measurement positions cannot be met. The main goal is to minimize the variance of the calculated reverberation times when using a directional source and receiver, or source-receiver relative positions with very small distances. For this purpose, the energy decay curve for individual octave bands is sampled in time. The estimation starts 2 ms after the direct sound. This is followed by several estimates of the RT over a 20 dB drop, starting 1 dB later with each iteration. The best fit mean of these values gives the estimated reverberation time. A comparison with the standard reverberation time estimation shows a variance reduction of 10% to 30% for binaural room impulse responses (BRIRs). The proposed method finds its application in situations where measurements can only be made at a few positions in the room and/or only in a few areas of the room. Furthermore, the method should be better suitable for measurements with receivers located near or at the head of a person.



Stolz, Georg; Klein, Florian; Werner, Stephan; Treybig, Lukas; Bley, Andreas; Martin, Christian
Discussion of acoustic and perceptual optimization methods for measuring spatial room impulse responses with a mobile robotic platform. - In: 2023 Immersive and 3D Audio: from Architecture to Automotive (I3DA), (2023), insges. 7 S.

In the field of Auditory Augmented Reality (AAR), one aim is to provide a listening experience that is as close as possible to a real scenario. Measured Spatial Room Impulse Responses (SRIRs) describe the acoustics of a room and can serve as a reference for acoustic simulations or parametrization of room acoustics. In previous works, a measurement system for SRIRs using a mobile robotic platform was introduced. The system consists of a commercially available self-driving platform on which a microphone array is mounted, while the sound sources are distributed at fixed positions in the room. The system is able to conduct high spatial resolution measurements of SRIRs in a uniform grid. In applications where time is limited and/or the area to discover is large, however, a high-resolution measurement is not always feasible.Therefore, the goal of this contribution is to compare different approaches for optimizing the measurement grid. One approach is to use mathematical optimization on acoustic parameters derived from a small set of initial measurements to determine new measurement positions in a iterative manner. Another approach is to optimize the measurement grid in respect to human auditory perception, incorporating e.g. just-noticeable differences of distance and localization perception.The results show that both approaches can achieve significant reductions in the number of measurements required for a adequate acoustic spatial reproduction, with different trade-offs depending on the application scenario and the available prior information.



https://doi.org/10.1109/I3DA57090.2023.10289338
Treybig, Lukas; Höbel-Müller, Juliane; Werner, Stephan; Nürnberger, Andreas
Acoustic inter- and intra-room similarity based on room acoustic parameters. - In: Engineering for a changing world, (2023), 5.2.136, S. 1-15

This paper shows various approaches for determining acoustic (dis-)similarity based on room acoustic parameter values derived from real measurements. The similarity is calculated across different room configurations and/or between different microphone-loudspeaker positions within the same room configuration. We compare supervised (LDA, Random Forrest) and unsupervised techniques (PCA, SPPA) and pre-selected visualizations in terms of their ability to exhibit inter- and intra-room (dis-)similarities. The data set generated comprises spatially high-resolution room impulse responses obtained from multiple source-receiver positions within a room configuration. The room acoustics are varied by introducing active walls and geometries accounting for specific room configurations. The results show that the separation of room configurations primarily relies on specific acoustic parameters, with the reverberation time playing an important role. Within a given room configuration, the acoustic parameters excluding the reverberation time mainly capture the orientation and distance between the source and receiver.



https://doi.org/10.22032/dbt.58929
Klein, Florian; Surdu, Tatiana; Treybig, Lukas; Werner, Stephan
The ability to memorize acoustic features in a discrimination task. - In: Journal of the Audio Engineering Society, ISSN 0004-7554, Bd. 71 (2023), 5, S. 254-266

How humans perceive, recognize, and remember room acoustics is of particular interest in the domain of spatial audio. For the creation of virtual or augmented acoustic environments, a room acoustic impression matches the expectations of certain room classes or a specific room. These expectations are based on the auditory memory of the acoustic room impression. In this paper, the authors present an exploratory study to evaluate the ability of listeners to recognize room acoustic features. The task of the listeners was to detect the reference room in a modified ABX double-blind stimulus test that featured a pre-defined playback order and a fixed time schedule. Furthermore, the authors explored distraction effects by employing additional nonacoustic interferences. The results show a significant decrease of the auditory memory capacity within 10 s, which is more pronounced when the listeners were distracted. However, the results suggest that auditory memory depends on what auditory cues are available.



https://doi.org/10.17743/jaes.2022.0073
Treybig, Lukas; Saini, Shivam; Werner, Stephan; Sloma, Ulrike; Peissig, Jürgen
Room acoustic analysis and BRIR matching based on room acoustic measurements. - In: AES International Conference on Audio for Virtual and Augmented Reality (AVAR 2022), (2022), S. 48-57

To achieve the goal of a perceptual fusion between the auralization of virtual audio objects in the room acoustics of a real listening room, an adequate adaptation of the virtual acoustics to the real room acoustics is necessary. The challenges are to describe the acoustics of different rooms by suitable parameters, to classify different rooms, and to evoke a similar auditory perception between acoustically similar rooms. An approach is presented to classify rooms based on measured BRIRs using statistical methods and to select best match BRIRs from the dataset to auralize audio objects in a new room. The results show that it is possible to separate rooms based on their room acoustic properties, that the separation also corresponds to a large extent to the perceptual distance between rooms, and that a selection of best match BRIRs is possible.



Klein, Florian; Surdu, Tatiana; Treybig, Lukas; Werner, Stephan; Aretz, Arthur; Birth, Kilian; Edelmann, Niklas; Seitelmann, Florian; Ziener, Christian; Sporer, Thomas
Auditory room identification in a memory task. - In: AES International Conference on Audio for Virtual and Augmented Reality (AVAR 2022), (2022), S. 132-141
Richtiger Name des Verfassers: Florian Seitelmann

How we perceive and remember room acoustics is of particular interest in the domain of spatial audio. For the creation of virtual or augmented acoustic environments, a room acoustic impression needs to be created which matches the expectations of certain room classes or a specific room. These expectations are based on the auditory memory of the acoustic room impression. In this paper, we present an exploratory study to evaluate the ability of listeners to remember specific rooms. The task of the listeners was to detect the reference room in a modified ABX double-blind stimulus test which featured a pre-defined playback order and a fixed time schedule. Furthermore, we explored distraction effects by employing additional non-acoustic interferences. The results show a significant decrease of the auditory memory capacity within ten seconds, which is more pronounced when the listeners were distracted. However, the results suggest that auditory memory depends on what auditory cues are available.



Treybig, Lukas; Cohrs, Thaden; Schade, Hans-Peter
Arraymikrofone mit netzwerkbasierter Übertragung im Fernsehstudio :
Network-based array microphones in TV studio. - In: Expertise in audio media, ISBN 978-3-9812830-7-5, (2017), S. 245-248

This contribution gives a field report for the use of network-based array microphones in a television news broadcast studio. Presenters are captured with multiple beam patterns. A network based signal processing unit used to generate this multiple directivity. The test setup has been integrated into the production environment with the IEEE AVB/TSN network standard suite using the existing network infrastructure. The main part of this contribution refers to the question in how far the deployment of array microphones with digital signal processing is suitable for television studios. For this purpose, the sound quality of the microphone array beams is compared with signals captured with conventional clip-on microphones. Moreover, resulting acoustic problems and solutions are discussed.



Cohrs, Thaden; Treybig, Lukas
Array microphones and signal processing within an ethernet-based AVB network. - In: Proceedings 2016 IEEE 6th International Conference on Consumer Electronics - Berlin (ICCE-Berlin), ISBN 978-1-5090-2096-6, (2016), S. 145-148

http://dx.doi.org/10.1109/ICCE-Berlin.2016.7684741
Treybig, Lukas;
Implementierung von Mikrofoncontrolleralgorithmen in eingebetteten Systemen. - 101 S. : Ilmenau, Techn. Univ., Masterarbeit, 2014

Mikrofone sind ein wichtiges Element von Sprachkommunikationssystemen. In vielen Anwendungen werden dabei Freisprecheinrichtungen verwendet. Dies führt dazu, dass neben dem eigentlichen Sprechersignal auch Störgeräusche aufgenommen werden, welche die Qualität des Sprechersignals beeinträchtigen können. Digitale Signalverarbeitungsverfahren ermöglichen es Störungen zu unterdrücken und damit das Sprechersignal zu verbessern. Dabei werden unteranderem Mikrofonarrays, bestehend aus mindestens zwei Mikrofonen, eingesetzt. Ein Prinzip ist dabei das Beamforming, bei welchem die einzelnen Laufzeiten der Mikrofonsignale bezüglich des Sprechersignals synchronisiert werden, damit diese sich bei der anschließenden Signalmittelung unverzerrt überlagern. Gleichzeitig werden Störquellen aus anderen Richtungen und ungerichtete Störungen gedämpft. Im Rahmen dieser Arbeit wird eine dynamische Laufzeitsteuerung für zwei Mikrofonsignale entwickelt, welche die Laufzeitdifferenz zwischen den Signalen mittels Analyseverfahren bestimmt und ausgleicht. Die Grundlagen bilden die theoretische Betrachtung der Mikrofonsignale und verschiedener Laufzeitanalyseverfahren. Des Weiteren werden die Evaluation der Laufzeitanalyseverfahren, sowie die Implementierung einer Laufzeitsteuerung in ein eingebettetes System beschrieben. Als Zielplattform dient dabei das ADSP-21364 EZ-KIT Lite Evaluationsboard der Firma Analog Devices. Der Digitale Signalprozessor bietet dabei die Möglichkeit einer flexiblen und latenzarmen Verarbeitung der Audiosignale. In der Auswertung werden die Funktionalität der Laufzeitsteuerung und deren Grenzen aufgezeigt. Zudem werden zu lösende Probleme und mögliche Ansätze zur Weiterentwicklung dargelegt.