TY - CHAP A1 - Müller, Regine ED - Hobelsberger, Hans T1 - Professionalisation and academisation of social work in the process of transformation: Opening Remarks T2 - Social glocalisation and education. social work, health sciences and practical theology perspectives on change Y1 - 2020 SN - 978-3-8474-1512-1 SP - 267 EP - 269 PB - Verlag Barbara Budrich CY - Leverkusen ER - TY - CHAP A1 - Müller, Regine ED - Hobelsberger, Hans T1 - Negotiating with social problems. Professionalism in combatting child poverty in Germany T2 - Social glocalisation and education. social work, health sciences and practical theology perspectives on change Y1 - 2020 SN - 978-3-8474-1512-1 SP - 279 EP - 286 PB - Verlag Barbara Budrich CY - Leverkusen ER - TY - CHAP A1 - Greif, Jakob A1 - Ackermann, David A1 - Kokabi, Omid A1 - Weinzierl, Stefan T1 - Kann man die Form eines Konzertsaales hören? Ein audiovisueller Test in simulierten 3D-Umgebungen [Abstract] T2 - Fortschritte der Akustik – DAGA 2020 - 46. Jahrestagung für Akustik, 16.-19. März 2020, Hannover Y1 - 2020 UR - https://web.archive.org/web/20240707010113/https://pub.dega-akustik.de/DAGA_2020/data/articles/000432.pdf SN - 978-3-939296-17-1 SP - 1153 EP - 1156 PB - Deutsche Gesellschaft für Akustik e.V. ER - TY - JOUR A1 - Brinkmann, Fabian A1 - Aspöck, Lukas A1 - Ackermann, David A1 - Lepa, Steffen A1 - Vorländer, Michael A1 - Weinzierl, Stefan T1 - A Round Robin on Room Acoustical Simulation and Auralization JF - Journal of the Acoustical Society of America N2 - A round robin was conducted to evaluate the state of the art of room acoustic modeling software both in the physical and perceptual realms. The test was based on six acoustic scenes highlighting specific acoustic phenomena and for three complex, “real-world” spatial environments. The results demonstrate that most present simulation algorithms generate obvious model errors once the assumptions of geometrical acoustics are no longer met. As a consequence, they are neither able to provide a reliable pattern of early reflections nor do they provide a reliable prediction of room acoustic parameters outside a medium frequency range. In the perceptual domain, the algorithms under test could generate mostly plausible but not authentic auralizations, i.e., the difference between simulated and measured impulse responses of the same scene was always clearly audible. Most relevant for this perceptual difference are deviations in tone color and source position between measurement and simulation, which to a large extent can be traced back to the simplified use of random incidence absorption and scattering coefficients and shortcomings in the simulation of early reflections due to the missing or insufficient modeling of diffraction. Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-59034 SN - 0001-4966 VL - 145 IS - 4 SP - 2746 EP - 2760 PB - Acoustical Society of America ER - TY - JOUR A1 - Ackermann, David A1 - Brinkmann, Fabian A1 - Zotter, Franz A1 - Kob, Malte A1 - Weinzierl, Stefan T1 - Comparative Evaluation of Interpolation Methods for the Directivity of Musical Instruments JF - EURASIP Journal on Audio, Speech, and Music Processing N2 - Measurements of the directivity of acoustic sound sources must be interpolated in almost all cases, either for spatial upsampling to higher resolution representations of the data, for spatial resampling to another sampling grid, or for use in simulations of sound propagation. The performance of different interpolation techniques applied to sparsely sampled directivity measurements depends on the sampling grid used but also on the radiation pattern of the sources themselves. Therefore, we evaluated three established approaches for interpolation from a low-resolution sampling grid using high-resolution measurements of a representative sample of musical instruments as a reference. The smallest global error on average occurs for thin plate pseudo-spline interpolation. For interpolation based on spherical harmonics (SH) decomposition, the SH order and the spatial sampling scheme applied have a strong and difficult to predict influence on the quality of the interpolation. The piece-wise linear, spherical triangular interpolation provides almost as good results as the first-order spline approach, albeit with on average 20 times higher computational effort. Therefore, for spatial interpolation of sparsely sampled directivity measurements of musical instruments, the thin plate pseudo-spline method applied to absolute-valued data is recommended and, if necessary, a subsequent modeling of the phase KW - Source directivity KW - Spatial interpolation KW - Musical instruments Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-58992 SN - 1687-4722 VL - 2021 IS - 1 PB - Springer Nature ER - TY - BOOK ED - Müller, Regine ED - Nüsken, Dirk T1 - Child Protection in Europe: Von den Nachbarn lernen – Kinderschutz qualifizieren KW - Kinderschutz KW - Europa Y1 - 2010 SN - 9783830924036 PB - Waxmann CY - Münster, New York, München, Berlin ER - TY - CHAP A1 - Feistel, Stefan A1 - Ackermann, David A1 - Weinzierl, Stefan T1 - Using High-Resolution Directivity Data of Musical Instruments for Acoustic Simulation and Auralization T2 - Proceedings of the 155th Audio Engineering Society Conventio, New York, 25-27th of October 2023. Y1 - 2023 PB - Audio Engineering Society ER - TY - CHAP A1 - Bögelein, Silke A1 - Brinkmann, Fabian A1 - Ackermann, David A1 - Weinzierl, Stefan T1 - Localization Cues of a Spherical Head Model [Abstract] T2 - Fortschritte der Akustik – DAGA 2018 - 44. Jahrestagung für Akustik 19.-22. März 2018, München Y1 - 2018 UR - https://pub.dega-akustik.de/DAGA_2018/data/articles/000459.pdf SN - 978-3-939296-13-3 SP - 347 EP - 350 PB - Deutsche Gesellschaft für Akustik e.V. ER - TY - JOUR A1 - Ackermann, David A1 - Böhm, Christoph A1 - Brinkmann, Fabian A1 - Weinzierl, Stefan T1 - The Acoustical Effect of Musicians’ Movements During Musical Performances JF - Acta Acustica united with Acustica N2 - Acoustic musical instruments act as dynamic sound sources communicating the expressive intentions of a performer to the audience in a dedicated spatial environment. From an acoustical point of view, the directivity of musical instruments is relevant both for the loudness and timbre of an instrument at a certain position in the audience, as well as for the spatial characteristics of the generated sound field. Musical instruments, however, are dynamic sound sources always moved by musicians as an element of their performance on stage. This work aims at assessing the acoustical effect and the perceptual relevance of these movements. For this purpose, we have recorded solo musical performances with all standard orchestral instruments with an optical motion tracking system, as well as the corresponding audio signals. The effect of the movements was evaluated by analysing the spectral fluctuation and the time-dependence of room acoustical parameters in a virtual acoustic environment in anechoic and reverberant conditions. In a subsequent listening test, an auralization of the static and dynamic musical performance was presented to listeners by binaural synthesis, showing that the signal-related fluctuations are clearly audible both in anechoic and reverberant situations. We discuss different approaches how to consider these effects for the simulation of natural acoustic sources in virtual acoustic reality. Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-59024 SN - 1861-9959 VL - 105 IS - 2 SP - 356 EP - 367 PB - Hirzel ER - TY - JOUR A1 - Ackermann, David A1 - Fiedler, Felicitas A1 - Brinkmann, Fabian A1 - Schneider, Martin A1 - Weinzierl, Stefan T1 - On the Acoustic Qualities of Dynamic Pseudo-Binaural Recordings JF - Journal of the Audio Engineering Society N2 - The motion-tracked binaural (MTB) technique allows the dynamic, pseudobinaural rendering of spatial sound scenes recorded by a circular array of microphones on a rigid sphere. The system provides a multichannel live audio transmission from which a head-related signal with approximated interaural time and level differences can be derived and played via headphones, head tracking, and a corresponding rendering software. The latter is mainly calculating imperceptible interpolation between channel pairs during head movements. This contribution evaluates the potential of this format for the creation of virtual acoustic envi- ronments. Based on the technical realization of a 16-channel MTB array with omnidirectional diffuse field-corrected electret condenser microphone capsules, the plausibility of 8 and 16-channel recordings was tested against a physical sound source. Furthermore, the sound quality of the pseudobinaural rendering was assessed based on different items of the Spatial Audio Quality Inventory (SAQI) compared to a true dynamic binaural reference. The results show that the overall plausibility of the MTB signal with optimal interpolation is close to the reference. Even if there are small differences with respect to tone color and spatial sound source attributes, the degree of externalization and even the perceived source elevation were, despite the absence of pinna cues, well comparable to the true binaural reference. KW - acoustics KW - pseudobinaural recording KW - motion-tracked binaural KW - MTB KW - microphone KW - sound Y1 - 2020 U6 - https://doi.org/10.17743/jaes.2020.0036 SN - 0004-7554 VL - 68 IS - 6 SP - 418 EP - 427 PB - Audio-Engineering Society ER -