Projects
Detection of the sound fields of ultrasonic sources freely available on the market: Estimation of the risk potential
Research project of the Federal Office for Radiation Protection in cooperation with the Gesellschaft für Angewandte Medizinische Physik und Technik (GAMPT) mbH
Project reference number FKZ 3620S72412,
Start 2020
Ultrasound devices for home use can be freely purchased via international trading platforms. The freely available devices include devices for prenatal examinations, simple therapy devices and cosmetic devices. In this study, these devices were analysed using measurement technology and the risk potential was determined. Relevant guidelines and legal regulations on ultrasound protection as well as scientific publications were researched in advance. The aim was to conduct a representative study by categorising the products on the market.
The sixteen products selected focussed on cosmetic devices. Their technological principles and mechanisms of action are usually inadequately explained in the product descriptions, as their development and marketing are driven by strong market interests. Only a few independent works deal with ultrasound-based cosmetic devices. However, the existing publications point to numerous complications and risks associated with the use of ultrasound, particularly in the head area.
The ultrasound parameters of the products were determined in standardised tests and compared with known thermal and mechanical threshold values. To assess the intended and foreseeable use, the exposure time was also evaluated. The results show a predominantly high hazard potential in free application.
Presentation WHO meeting of the International Advisory Committee (IAC) on non-ionising radiation. 11-13 Jun 2024
Figure: Sound field of a heart rate monitor for prenatal examinationsNon-destructive testing of stringed instruments
In collaboration with the State Institute for Music Research of the Prussian Cultural Heritage Foundation, a purely acoustic method for measuring historical sound bodies has been developed in recent years[1]. This method has the great advantage that historical sound bodies can be measured and made audible without mechanical stress.
The method evaluates the sound body and its periphery with the help of a room acoustic impulse response measurement (AIR). A logarithmic sweep is used as the test signal. The measurement method was compared with the standard method, the hammer test.
[1] von Rüden, H., Schlesinger, A. (2019) Acoustical analysis of stringed instruments without touch, Proceedings of the International Symposium on Music Acoustics (ISMA), 13-17 September 2019, Detmold, Germany. Poster der Publikation
Figure: Classical guitar (left) and terz guitar (right) used in the comparison between the AIR method and the hammer probe
Figure: Spectro-temporal behavior of one guitar Publications
Acoustic Simulation
Ende, C., Koch, T., Kron, T., Höhle, L., Bartnitzek, J., Schlesinger, A., Egeler, J., Huth, C., Böhme, R. Schlüter, B. (2023, November). Auralization and Visualization for Infrastructure Planning in the Joint Project. In INTER-NOISE and NOISE-CON Congress and Conference Proceedings (Vol. 268, No. 4, pp. 4569-4580). Institute of Noise Control Engineering, Tokyo, Japan DOI: https://doi.org/10.3397/IN_2023_0651
Egeler, J., Huth, C., Schlesinger, A., Ende, C., Koch, T., Bartnitzek, J., Böhme, R., Schlüter, B. (2023, November). Planning Infrastructure Projects by means of Psychoacoustic Quantities in the Joint Project. In INTER-NOISE and NOISE-CON Congress and Conference Proceedings (Vol. 268, No. 4, pp. 4617-4627). Institute of Noise Control Engineering, Tokyo, Japan DOI: https://doi.org/10.3397/IN_2023_0658
Medical
Audiology
Agcaer, S., Schlesinger, A., Hoffmann, F., Martin, R. (2015), Optimization of Amplitude Modulation Features for Low-Resource Acoustic Scene Classification, EUSIPCO, Nice, France, September 2015.
Meutzner, H., Schlesinger, A., Zeiler, S., Kolossa, D. (2013). Binaural Signal Processing for Enhanced Speech Recognition Robustness in Complex Listening Environments, Proc. 2nd CHiME Workshop on Machine Listening in Multisource Environments, Vancouver, Canada, June 2013.
Schlesinger, A., Luther, C. (2013). Optimization of Binaural Algorithms for Maximum Predicted Speech Intelligibility in The Technology of Binaural Listening, Editor Blauert, J., Springer Berlin Heidelberg, June 2013.
Schlesinger, A. (2012). Transient-Based Speech Transmission Index for Predicting Intelligibility in Nonlinear Speech Enhancement Processors, ICASSP, pp. 3993-3996, Kyoto, Japan, March 2012.
Schlesinger, A. (2012). Binaural Model-Based Speech Intelligibility Enhancement and Assessment in Hearing Aids, PhD-Thesis, TU Delft, The Netherlands, January 2012.
Schlesinger, A., Boone, M. M. (2010). Speech Intelligibility Assessment in Binaural and Nonlinear Hearing Aids, in 2nd Workshop on Speech in Noise: Intelligibility and Quality, Amsterdam, January, 2010.
Boone, M.M., Opdam, R.C.G., Schlesinger, A. (2010). Downstream Speech Enhancement in a Low Directivity Binaural Hearing Aid, Proceedings of 20th International Congress on Acoustics (ICA) Sydney, August, 2010.
Schlesinger, A., Boone, M.M. (2010). The Characterization of the Relative Information Content by Spectral Features for the Objective Intelligibility Assessment of Nonlinearly Processed Speech, Proceedings of the Interspeech Conference, Tokyo, September 2010.
Schlesinger, A., Ramirez, J.-P., Boone, M.M. (2010). Evaluation of a Speech-Based and Binaural Speech Transmission Index, Proceedings of the AES 40th Conference on Spatial Audio, Tokyo, October, 2010.
Ramirez, J.-P., Raake, A., Schlesinger, A. (2010). Binaural and better ear listening predictions for spatially distributed sources, 2010 International Conference on Audio Language and Image Processing (ICALIP), pp 1776-1781, Shanghai, November, 2010.
Schlesinger, A., Boone, M.M. (2009). On the Application of Auditory Scene Analysis in Hearing Aids, 35th German Annual Conference on Acoustics (DAGA) Meeting (Joint Meeting with Acoustical Society of the Netherlands (NAG)), Rotterdam, March, 2009.
Schlesinger, A., de Vries, D. (2009). On the Application of Array Technology in Room Acoustics, 35th German Annual Conference on Acoustics (DAGA) Meeting (Joint Meeting with Acoustical Society of the Netherlands (NAG)), Rotterdam, March, 2009.
Schlesinger, A., Boone, M.M. (2009). Application of MVDR Beamforming to Spherical Arrays, 1st Ambisonics Symposium, Graz, June, 2009.
Schlesinger, A., Ramirez, J.-P., van Dorp-Schuitman, J., Boone, M.M. (2009). Report on a Binaural Extension of the Speech Transmission Index Method for nonlinear Systems and Narrowband Interference, Proc. Int. Symp. On Auditory and Audiological Research, Helsingbor, August, 2009.
Schlesinger, A., Boone, M.M. (2009), Modellbasierte Verbesserung von Sprachverständlichkeit in Hörgeräten, 20. Konferenz Elektronische Sprachsignalverarbeitung (ESSV), Dresden, September, 2009.
Schlesinger, A., Boone, M.M. (2008). Speech Intelligibility Enhancement in Hearing Aids based on optimized Spatial Beamforming and Computational Auditory Scene Analysis, 34rd German Annual Conference on Acoustics (DAGA), Dresden, March, 2008.
Schlesinger, A., Boone, M.M. (2008). Dual Noise Suppression in Hearing Aids, 124th Audio Engineering Society (AES) Convention, Amsterdam, May, 2008.
Schlesinger, A., Boone, M.M. (2008). Improving Speech Intelligibility based on a Conjunction of Multiple Perceptual Models, Acoustics'08, Paris, June 29-July 4, 2008.
Boone, M.M., de Vries, D., Andringa, T.C., Schlesinger, A., van Dorp Schuitman, J., Valkenier, B., van de Vooren, H. (2008). Modelling of the Cochlea Response as a Versatile Tool for Acoustic Signal Processing, Acoustics'08, Paris, June 29th -July 4th, 2008.
Schlesinger, A., Pesman, S., Boone, M.M. (2008) . Verbesserung der Sprachverständlichkeit in Hörgeräten, Proceedings 39. Jahrestagung Deutsche Gesellschaft für Medizinische Physik, Oldenburg, September, 2008.
Schlesinger, A., Boone, M.M. (2008). Evolutionary Optimization for Hearing Aids of Computational Auditory Scene Analysis, 126th Audio Engineering Society (AES) Convention, Munich, May, 2008.