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DTSTART;TZID=Europe/Berlin:20200703T110000
DTEND;TZID=Europe/Berlin:20200703T120000
DTSTAMP:20260504T043832
CREATED:20200624T161623Z
LAST-MODIFIED:20200703T090128Z
UID:1045-1593774000-1593777600@blog.rwth-aachen.de
SUMMARY:Hasti: Musical Blind Source Separation Using Ambisonics
DESCRIPTION:This talk will address the musical blind source separation problem: given multiple instrument tracks recorded together\, how can each be isolated from the others given no additional knowledge about the instrument locations or sounds? There are many advantages to solving the problem: live performances can convey the energy of the performers\, and the sound of the room can improve the perceptual quality of the recording\, while separating the instrument tracks afterwards allows for more precise equalization and mixing to improve the recording. This thesis proposes a novel approach to the problem using an ambisonic microphone array: the directionality of the microphones in the array provides information about the location of each source and allows for the implementation of a direction of arrival estimator that calculates the position of each source based on the directions that receive the most non-reverberant acoustic energy. Given the directions of arrival\, the method performs spatial filtering to virtually steer the microphone array in the desired directions. This approach is compared with a classic non-negative matrix factorization (NMF) approach and a state of the art ambisonic domain filtering approach. The proposed method outperforms NMF in nearly every tested configuration\, and outperforms the ambisonic filtering approach in certain high-reverberation cases. Importantly\, it is vastly more computationally efficient\, working in much less than real time\, and introduces less algorithmic noise to the separated tracks. \nMelden Sie sich Hier an um die Einladung zu dem Vortrag per E-Mail zu erhalten.\nRegister here to receive the invitation to this talk via E-Mail. \nZoom ID: 920 8400 8668\nPassword: 837069
URL:https://blog.rwth-aachen.de/akustik/event/hasti-musical-blind-source-separation-using-ambisonics/
LOCATION:Zoom-Meeting
CATEGORIES:Vortrag
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DTSTART;TZID=Europe/Berlin:20200710T110000
DTEND;TZID=Europe/Berlin:20200710T120000
DTSTAMP:20260504T043832
CREATED:20200604T113053Z
LAST-MODIFIED:20200705T083356Z
UID:1032-1594378800-1594382400@blog.rwth-aachen.de
SUMMARY:Aspöck: Validation of room acoustic simulation models
DESCRIPTION:Already in ancient times\, the goal existed to design appropriate environments to transport acoustic signals from a sound source to an audience. Strongly connected to this is the interest to understand room acoustic effects and\, in the best case\, to accurately predict them. This is of particular relevance today in prestigious projects such as the construction of concert halls\, but is also of great importance in everyday life\, for example in public buildings. Room acoustic simulations based on the concepts of geometric acoustics have been developed for such purposes for more than 50 years and have been extensively investigated. However\, there is still insufficient knowledge about the uncertainty and validity of the results of the room acoustic simulations used today. In addition\, many highly simplified simulation models are often used without questioning the validity of the results. \nIn order to offer developers and researchers a possibility to comprehensively validate the results of their room acoustic simulation\, a database with eleven different acoustic scenes was developed\, documented and published. The scenes cover both simple environments\, where individual acoustic effects such as reflection or diffraction are isolated\, and complex spatial situations such as a concert hall. In addition to a detailed description and the definition of input data\, acoustic measurements were carried out for all scenes\, which serve as reference for the simulations. \nFurthermore\, a study is presented which was designed following the concept of three previously conducted round robin experiments. Here\, the simulation results of up to six participants\, who were not informed about measurement results in advance\, are compared with each other and with the results of the corresponding measurements. The evaluation of the results for the simple scenes reveals various weaknesses of the geometric acoustics\, but in the case of the complex scenes it nonetheless shows acceptable results in the medium frequency range. In further investigations it was determined how much room acoustic simulation results deviate from measurements if the user knows the measurement results beforehand and input data of the simulation is adjusted manually or systematically. From these results it can be concluded which deviations from actual\, measured values can be expected in the room acoustic simulation of both unknown and known rooms. Furthermore\, this work provides a basis for improvements in the field of geometrical acoustics simulation models and with respect to the determination and selection of correct input data for the simulation. \nMelden Sie sich Hier an um die Einladung zu dem Vortrag per E-Mail zu erhalten.\nRegister here to receive the invitation to this talk via E-Mail. \nZoom-Meeting-ID: 991 6857 2650\nPasswort: 382923
URL:https://blog.rwth-aachen.de/akustik/event/aspoeck-validation-of-room-acoustic-simulation-models/
LOCATION:Zoom-Meeting
CATEGORIES:Verteidigung Dissertation
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DTSTART;TZID=Europe/Berlin:20200717T110000
DTEND;TZID=Europe/Berlin:20200717T120000
DTSTAMP:20260504T043832
CREATED:20200714T134536Z
LAST-MODIFIED:20200715T163148Z
UID:1034-1594983600-1594987200@blog.rwth-aachen.de
SUMMARY:Schäfer: Towards real-time auralization of aircraft noise using curved propagation paths
DESCRIPTION:Auralizations of simulationed aircraft flyovers can be used to experience aircraft noise in virtual environments. Compared to averaged sound pressure levels or noise maps\, listening to such an auralization provides a more sophisticated impression on how annoying the aircraft noise might be in a real scenario. For proper auralization results\, the inhomogeneity of the atmosphere\, which leads to curved sound paths\, has to be taken into account. However\, state of the art auralization tools either assume straight paths or are not real-time capable. \nIn this presentation\, a new framework is introduced which allows to simulate curved propagation paths between an aircraft and a receiver very efficiently. Its performance and limitations are discussed for a practical aircraft trajectory. Additionally\, the same scenario is auralized using binaural reproduction techniques. The results suggest that a real-time auralization of aircraft noise using curved paths might be possible if extending the current auralization framework accordingly. \nSince binaural signals will be presented\, it is highly recommended to use headphones during the presentation. \nMelden Sie sich Hier an um die Einladung zu dem Vortrag per E-Mail zu erhalten.\nRegister here to receive the invitation to this talk via E-Mail. \nZoom-Meeting-ID: 979 8374 4199\nPasswort: 120019
URL:https://blog.rwth-aachen.de/akustik/event/schaefer-towards-real-time-auralization-of-aircraft-noise-using-curved-propagation-paths/
LOCATION:Zoom-Meeting
CATEGORIES:Vortrag
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