Thesis

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Acoustic Analysis of the modern Recorder

Authors Kocher, L.
Year 2019
Thesis Type Bachelor's thesis
Topic Audio Signal Processing
Keywords Klanganalyse
Abstract This thesis considers the acoustic analysis of the so-called Helder Tenor, a modern recorder. Since the Helder Tenor is a rather new instrument and poorly studied, the analysis is focused on the frequency response characteristics and the partial harmonics of the flute. In order to make any conclusions, a baroque model, the most common used recorder model, and two more, are analysed, too. This allows to draw a direct comparison from the new model, which is still in development, to a well-tried model. Ultimately, the thesis should provide an interpretation of the main differences and advantages of the Helder Tenor compared to other, older recorder models.
Supervisors Höldrich, R.
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Calculation and Validation of the Noise Emission of Electric Machines

Authors Reitz, L.
Year 2018
Thesis Type Master's thesis
Topic Audio Signal Processing
Keywords Technische Akustik
Abstract The recent development of more powerful computers makes the simulation of electrical engines as data source for the computation of its noise emission, as opposed to measurements on the real object, more and more attractive. This work shall contribute to the response to the question to what extent Finite Element Method (FEM) based Multi-Body-Simulation (MBS) computation and noise emission computation are suited for qualitative and quantitative assessment of electric machines and where there is need for further research. At the focal point there are objective criteria such as torsional oscillation, level of structure-borne noise and noise level. Especially the accuracy of results, frequency range, model accuracy, and model depth should be put in the center of attention. A comparison of simulation results and existing measurement results is therefore executed. The simulation is carried out using a SIMULINK-model in combination with a commercial MBS-tool. Within the Multi-Body-Simulation the excitation of the chassis originating from the magnetic field is considered and from there first the structure-borne noise on the stator surface and subsequently the air-borne noise are calculated. The master’s thesis is conducted on behalf of and in cooperation with AVL List GmbH.
URL http://phaidra.kug.ac.at/o:73333
Supervisors Sontacchi, A., Pomberger, H.
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Efficient prediction of the listening area for plausible reproduction

Authors Kurz, E.
Year 2018
Thesis Type Master's thesis
Topic Psychoacoustics
Keywords Ambisonics, Surround, Wiedergabetechnik
Abstract For planning and installation of surrounding loudspeaker arrays for reproduction of threedimensional sound fields, among other objectives, the size of the auditorium with plausible localization is quite relevant. Nowadays this area, also called listening area, is estimated during the planning phase. This estimation is based on experience knowledge. However, the size of the listening area cannot exactly be determined before the loudspeaker array is installed. The prediction of the listening area is very important to avoid possible mistakes in the planning process. For prediction of the listening area usage of an efficient extended energy vector is quite reasonable [43]. The extension of the energy vector considers time and level differences in dependence on the listening position. Proceeding from [43], this master thesis refines a prediction algorithm. Based on results from [37], frequency-dependent panning is integrated. Moreover a model of image-sources is implemented to simulate wall reflections of arbitrary order. Furthermore the radiation pattern of the loudspeakers in the surrounding array are integrated. Therefore radiation patterns of different loudspeakers are measured. A listening experiment is performed to optimize parameters of the algorithm.
URL http://phaidra.kug.ac.at/o:76980
Supervisors Frank, M., Sontacchi, A.
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Sound Event Detection for Smart Card

Authors Linke, J.
Year 2018
Thesis Type Master's thesis
Topic Audio Signal Processing
Keywords Music Information Retrieval, Neuronal Networks
Abstract follows
Supervisors Sontacchi, A.
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Sonifikation von Flugverkehrsdaten

Authors Kerber, J.
Year 2018
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Abstract follows
Supervisors Weger, M.
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Plugin-Entwicklung zur Steuerung von Mikrofonrichtwirkungen

Authors Deppisch, T.
Year 2018
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Abstract folgt
Supervisors Frank, M.
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Authors Bereuter, P.
Year 2018
Thesis Type Bachelor's thesis
Topic Spatial Audio
Abstract The present bachelor thesis is subdivided into two major chapters. The first one deals with the documentation of sound power calculations which were conducted by means of the software application Matlab. Before the calculation process in Matlab is elaborated, theoretical backgrounds and comparisons with relevant norms are discussed. The sound power calculations as well as the discussion of the findings exclusively relate to a head and torso simulator which was measured in a special double circle microphone array. An explanation of the necessary data elaboration can be found in the subchapter following the theoretical background. The same microphone array was used to produce vocal recordings: These were used to examine changes of timbre dependent on different directions. The second chapter of this thesis deals with this topic. The analysis of timbres is carried out with the help of audio descriptors which were calculated by means of a toolbox in Matlab which was especially designed for this purpose. The second chapter, similar to the first one, comprises a survey of theoretical backgrounds which is followed by a subchapter on data processing where the editing/postprocessing of the recordings are summed up. Eventually, the structure of the Matlab Code used for the calculation of the audio descriptors is cited. Additionally, the actual analysis of timbres and tones is carried out in chapter “findings“. Firstly, the purpose of the present thesis is to find a simple method of the calculation of sound power in the double circle microphone array and document its precision by estimating errors. Moreover, Matlab shall be used to find a systematic method to analyse the timbres and tones of the vocal recordings in the double circle microphone array. The thesis concludes with a list of positive and negative aspects accompanying the use of the Matlab-toolbox designed for the analysis of timbres.
Supervisors Sontacchi, A.
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Trennung von Sprache und Hintergrundgeräuschen

Authors Häusler, L.
Year 2018
Thesis Type Bachelor's thesis
Topic Audio Signal Processing
Abstract In dieser Bachelorarbeit sollte eine Methode für das Herausfiltern von Sprache aus einem Stereo-Audio-Signal definiert und ausgearbeitet werden. Hierfür wurde die Kohärenzfunktion zweier Kanäle gebildet und mithilfe spektraler Filterung bzw. Manipulation eine Maske generiert, welche die Signalanteile, die vermutlich Sprache enthalten, isoliert aus dem Eingangssignal extrahiert. Der in Matlab ausgearbeitete Algorithmus wurde in JUCE als VST-Plugin implementiert und gestestet.
Supervisors Sontacchi, A.
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Binaural 3D Audio - Die Geschichte und die Zukunft

Authors Langgartner, L.
Year 2018
Thesis Type Bachelor's thesis
Topic Spatial Audio
Abstract This thesis was authored with the intent of presenting the theoretical background, the history and the current state of research in the field of binaural 3D Audio. In addition, in chapter 7, a headphone prototype which was developed at the Institute of Electronic Music and Acoustics of the University of Music and Performing Arts Graz and the evaluation of a test made with this headphone is presented.
Supervisors Sontacchi, A.
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Modeling the echo suppression for diffuse reflections

Authors Wegler, K.
Year 2018
Thesis Type Master's thesis
Topic Psychoacoustics
Keywords Klang und Raum
Abstract The precedence effect refers to a group of phenomena where the direct sound dominates the perception. Studies concerning the precedence effect mainly use specular reflections to investigate the influence of reflection characteristics like absorption, time delays or directions of arrival. The sound field reflected on real-life wall is partly scattered into angles other than the specular reflection angle, yielding a spatial and temporal widening of the reflection. In this context the scattering coefficient describes the portion of energy reflected to other directions than the specular direction. This thesis shall investigate the strength of the precedence effect by testing the echo threshold of diffuse reflections. Listening tests will be performed and the obtained data will be used to enhance models for the echo suppression.
Supervisors Wendt, F., Höldrich, R.
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Modalsynthese rechteckiger Platten

Authors Bradl, H.
Year 2018
Thesis Type Bachelor's thesis
Topic Audio Signal Processing
Abstract Ziel dieser Arbeit ist die Anwendung der Modalsynthese auf isotrope rechteckige Platten. Anhand solch einfacher Körper bekommt man ein gutes Verstandnis für das Verfahren und die einzelnen Schritte, die bei einer Implementierung zu beachten sind. Im einführenden Teil wird, so ausführlich es im Rahmen einer Bachelorarbeit möglich ist, versucht, grundlegende Prinzipien zu erläutern bzw. herzuleiten. Auch wird kurz auf schwingende Saiten, Stäbe und Membranen eingegangen. Der zweite Teil der Arbeit widmet sich der detaillierten Modellierung rechteckiger Platten, wobei 15 verschiedene Randbedingungen behandelt werden.
URL http://phaidra.kug.ac.at/o:73328
Supervisors Höldrich, R.
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Attractive Correlations

Authors Giannoutakis, K.
Year 2018
Thesis Type Master's thesis
Topic Algorithmic Composition
Abstract This thesis presents the performance ecosystem “Attractive Correlations”. In the emerging field of the ecosystemic framework in music, an overlooked conviction seems to contradict a fundamental principle in this line of creative thought. “Attractive Correlations” propose new directions for dealing with the problematic of the reduced ability of experiencing some of the reciprocal relationships between the involved agencies. The methods that were implemented in the artistic work and investigated in this thesis are: the dissolution of the central stage by the installative articulation of space with various smaller stages and spots, the dynamic alteration of listening modes for the human-agents, the reduced influence of the agency of technocratic determinism via dynamical DSP routines, the extension of the algorithmicity in a perceivable performative domain and the audience conditioning through preparatory events and unconventional concert configurations.
URL http://phaidra.kug.ac.at/o:73300
Supervisors Eckel, G.
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"El Camino" Texturbasiertes Komponieren in der Computermusik

Authors Mayer, J.
Year 2018
Thesis Type Bachelor's thesis
Topic Algorithmic Composition
Abstract „El Camino“ (dt. der Weg) ist Titel und Thema sowohl des künstlerischen Klangstücks wie auch der vorliegenden schriftlichen Arbeit. Diese versteht sich einerseits retrospektiv als ideologische wie auch technisch-handwerkliche Dokumentation, andererseits auch als tiefer gehende Betrachtung und Kontextualisierung des künstlerisch-kreativen Zugangs an das genannte Stück. Dass sich hierbei Texturen zum zentralen Bedeutungsschwerpunkt erheben, suggeriert bereits der Untertitel der Arbeit. Der Weg, den es hierbei zu beschreiten gilt, beginnt zunächst mit der Auseinandersetzung mit Begrifflichkeiten (Kapitel 2), welche sich sowohl in der vorliegenden Arbeit wie auch möglicherweise darüber hinaus als Hilfsmittel zur Beschreibung klanglicher Phänomene begreifen lassen. So sollen hier Begriffe wie „Textur“, „Drone“ und „Geste“ einander gegenübergestellt und miteinander verglichen sowie auch deren Misch- bzw. Übergangsformen herausgestellt werden. Fortgesetzt wird die Wanderung mit Kapitel 3 mit einer Darstellung jener Inspirationsquellen, welche sich für das eigene Schaffen in mannigfaltiger Hinsicht als – im buchstäblichen Sinne – wegweisend zeichnen. Kern-Wegstück der Arbeit ist unmissverständlich Kapitel 4, der Weg – „El Camino“ – per se. Hier sollen einerseits metaphorisch-ideologische Überlegungen zum Stück angestellt, andererseits dessen Entstehungsprozess sowohl künstlerisch als auch technisch umrissen werden. Um dem Untertitel der vorliegenden Arbeit gerecht zu werden, sollen in diesem Zusammenhang drei unterschiedliche repräsentative Klangtexturen des Stücks eingehend beleuchtet werden, was mit einer groben Erläuterung des zugrunde liegenden Programmiercodes mit entsprechendem klanglichen Resultat einhergeht.
URL http://phaidra.kug.ac.at/o:73329
Supervisors Ciciliani, M.
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Musicking - kammermusikalische Aspekte in "together - alone" und "encounters"

Authors Trenkwalder, A.
Year 2018
Thesis Type Bachelor's thesis
Topic Algorithmic Composition
Abstract In der vorliegenden Bachelorarbeit beschreibe ich zwei Stücke für Instrumente mit Live-Elektronik, die sich mit der Frage der „kammermusikalischen Qualitäten“ von Live-Elektronik künstlerisch auseinandersetzen. Zu diesem Zeitpunkt stellten sich mir folgende Fragen: „Wie kann ich Live-Elektronik als einen gleichwertigen Partner zu einem Instrumentalisten etablieren bzw. vice versa?“ „Welche Formen der Interaktion zwischen Instrumentalist und Live-Elektronik-Musiker sind möglich?“ „Welche Rolle spielt physische Präsenz beim Musizieren (mit Live-Elektronik)?“ Diese Fragen werden in den Stücken together – alone und encounters auf verschiedene Weise behandelt und bilden die Grundlage für diese Bachelorarbeit.
URL http://phaidra.kug.ac.at/o:73303
Supervisors Eckel, G.
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Das soziopolitische Potential von Raumakustik im Angesicht zeitgenössischer Gestaltungsmöglichkeiten

Authors Manhartsberger, A.
Year 2018
Thesis Type Bachelor's thesis
Topic Algorithmic Composition
Abstract Ausgangspunkt der Arbeit bilden zwei, musikalische Strömungen nach 1950, deren soziopolitische Forderungen zum fruchtbaren Boden künstlerischer Auseinandersetzung mit Raum werden sollten. Der historische Abriss ist als selektive Interpretation vorliegender Quellen zu deuten, um jene Aspekte zu verdeutlichen, die meiner Meinung nach im Kontext elektronischer Raummusik nach wie vor von Bedeutung sind. Durch den Exkurs in die Raumsoziologie und den Verweis auf die Phänomenologie der Wahrnehmung, soll die folgende Argumentation in den zeitgenössischen Diskurs der Konstitution von Raum, gebettet werden. Den Hauptteil bildet die Besprechung von zwei Installationen und einem fixed-media Stück eigener Praxis, für deren Realisierung die Auseinandersetzung mit Raum und seinen sozialen und soziopolitischen Wirkungen zentral von Bedeutung wurde. Motivation dieser Arbeit ist meine Ansicht, dass wir als Komponist*innen besonders heute, in Zeiten des zunehmendem politischen Totalitarismus und dem Verfall der Demokratie, dazu aufgerufen sind, die zur Verfügung stehenden künstlerischen Mittel zu erkennen, um gestalterisch am Konstitutionsprozess der gesellschaftlichen Wirklichkeit, teilzunehmen.
URL http://phaidra.kug.ac.at/o:73304
Supervisors Ciciliani, M.
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DIY Mixed Order Ambisonics Microphone Array

Authors Romanov, M.
Year 2018
Thesis Type Audio Engineering project
Topic Spatial Audio
Abstract In this work a Mixed-Order-Ambisonics microphone is build. Several approaches to equalize spherical microphones are presented and the easiest way used by multichannel filters to achieve a good sounding result. The idea here is to build a cheap microphone array that can compete with others available on the market. Also it must be easy to build alone without assuming to much theory so everyone can do this at home.
URL http://phaidra.kug.ac.at/o:73334
Supervisors Ritsch, W.
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Compact spherical loudspeaker arrays: new filter and layout ideas

Authors Riedel, S.
Year 2018
Thesis Type Master's thesis
Topic Spatial Audio
Abstract Compact spherical loudspeaker arrays employ modal beamforming techniques to precisely excite wall reflections. In their performance practice (e.g. with the IKO) it turned out that it is mostly the horizontal plane, in which suitable reflections from nearby baffles or walls create distinct auditory events. Moreover, human localisation is known to be more precise in the horizontal plane. This motivates the initiative to further develop the modal beamforming. In particular, a combined mixed-order and panning control is developed to increase the horizontal resolution. This approach inspires the design of special layouts with loudspeakers concentrated in the horizontal plane. In addition this thesis discusses a two-band approach for the control of spherical loudspeaker arrays. In the lower band, spherical beamforming is feasible and short equalization crosstalk cancellation filters can be designed. In the higher band, where beamforming is impaired due to spatial aliasing and the focused radiation of the loudspeakers, an amplitude panning approach is employed, e.g. using AllRAD.
Supervisors Zotter, F.
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Authors Blochberger, M.
Year 2018
Thesis Type Audio Engineering project
Topic Spatial Audio
Abstract folgt
Supervisors Zotter, F.
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Artistic Time-Stretching

Authors Planton, M.
Year 2018
Thesis Type Bachelor's thesis
Topic Algorithmic Composition
Abstract The generation of an Auditory Virtual Environment after Jens Blauert, in short AVE, is the creation of the auditory part of an interactive virtual environment. In this virtual environment humans have perceptions, that do not correspond to their physical environment. Time-Stretching refers to a time prolongation of an audio signal without effecting its pitch. This can be achieved with various algorithms, which produce different artifacts. The concept “Artistic Time-Stretching” has been developed, that uses these artifacts as a musical effect to create an AVE. To use this concept in a theatre production of Kafka’s “The Trial”, the needed realtime capable software has been developed. With the help of Ambisonics, a three-dimensional surround sound technique, a live performance originated in cooperation with directors and actors, which was successfully used in the public performances.
Supervisors Ritsch, W.
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Verbesserte räumliche Wiedergabe durch Quellseparation

Authors Meyer-Kahlen, N.
Year 2018
Thesis Type Master's thesis
Topic Audio Signal Processing
Keywords Music Information Retrieval
Supervisors Sontacchi, A.
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Auralization of Sources with Controllable Directivity using the upscaled Source-and-Receiver-Directional RIR

Authors Zagala, F.
Year 2018
Thesis Type Audio Engineering project
Topic Spatial Audio
Keywords Aufnahme- und Wiedergabetechnik, Psychoakustik
Abstract The assumption of spatial and temporal sparsity of acoustical reflections led to the Spatial Decomposition Method (SDM) for Room Impulse Responses, which was proposed in 2013 by Sakari Tervo [TPKL13]. Based on efficient B-format measurements, the SDM method allows for auralization of omnidirectional sources with a sharpened directional RIR (DRIR) at the receiver. A generalization of the SDM is proposed for the Source and Receiver Directional (SRD) RIR, which allows for auralization of sources with controllable directivity [ZBS+17]. In this project the perceptual aspects of the auralization with an efficiently measured SRD-RIR are discussed based on a comparative listening experiment involving the variable-directivity icosahedral loudspeaker (IKO).
URL http://phaidra.kug.ac.at/o:76988
Supervisors Zaunschirm, M.
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ELSE: An Artistic Study on Algorithmic Agency in Sound Synthesis Composition

Authors Pozzi, D.
Year 2018
Thesis Type Computer Music project
Topic Algorithmic Composition
Abstract This article presents the development of a SuperCollider patch as a case study of the influence of algorithmic processes and algorithmic thinking in computer music practice. The crucial stages involved in the experimental design of a sound synthesis algorithm are analysed from a critical perspective that aims at exploring the multifaceted dynamics underpinning the relationship between artist and algorithmic process. In doing this, I’ll try to highlight the different agencies that contribute to shape the creative process of composing music with computers. It is suggested that the process of constant reconfiguration, intended as the iterative adaptation that takes place between an artist and the algorithms employed, has a major generative role in algorithmic practice. We may identify this generative element as one specific expression of the agency of the algorithmic. The case study is based on a retrospective documentation of Else, a generative algorithm conceived and realised in SuperCollider.
URL http://phaidra.kug.ac.at/o:77435
Supervisors Pirrò, D.
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Perceptually Motivated Ambient Scene Recording and Parametric Source Embedding

Authors Frauscher, E.
Year 2018
Thesis Type Master's thesis
Topic Audio Signal Processing
Keywords Spatial Audio
Abstract Various auditory experiments rely on the availability of highly authentic or highly plausible reference reproductions of real acoustic environments, for which the required capture, reproduction, and customization methods are investigated in this work. Most of the current approaches are based on simulated room impulse responses which allows a great freedom in customization; however, they can still be challenging as not all simulation settings will sound natural. As an alternative, this thesis targets a hybrid spatial recording and reproduction technique that allows to record real 3-dimensional acoustic scenes, and to customize them by parameterising embedded source material or the given recording by modifying its content. To preserve naturalness, parameterization requires to utilize estimated sound field parameters derived either from features captured in the recording environment or the recording itself. The proposed capture and parameterization approaches target loudspeaker-based reproduction. They are tested against reference dummy head and main microphone recordings in listening experiments to evaluate their authenticity and plausibility, among some relevant attributes.
Supervisors Zotter, F., Höldrich, R.
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Akustische Warnsignale und Verkehrslärmumgebung: Wiedererkennbarkeit und wahrgenommene Dringlichkeit von Fahrradklingeln

Authors Frohmann, L.
Year 2018
Thesis Type Bachelor's thesis
Topic Sonification
Keywords Psychoakustik
Abstract Raising awareness about how alarm sounds are perceived and evaluated by an individual in traffic scenery is important for developing new alarm designs, as well as for improving existing ones. Bearing a positive contribution to road safety, cyclists and pedestrians especially can benefit from appropriate alarming bell and horn sounds. This work focuses on the perception of urgency for various types of bicycle bells, as well as on acoustical descriptors influencing our judgement. The conducted listening experiments reveil the recognizability of bike bells among other everyday sounds and show urgency scores for testing in both silent surrounding and with additional traffic noise background. The results support a warning sound ranking in terms of efficiency and lead to an objective urgency model formed by spectral and temoral sound parameters.
URL http://phaidra.kug.ac.at/o:76982
Supervisors Höldrich, R., Weger, M.
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Optimum-phase primal signal and radiation-filter modelling of musical instruments

Authors Zagala, F.
Year 2018
Thesis Type Master's thesis
Topic Spatial Audio
Abstract Capture of musical instruments including directivity by spherically surrounding microphone array often leads to either overly complex radiation patterns or destructive interferences at high frequencies. There, small differences in the distance from the instrument to each of the microphones yield different arrival times in the captured signal and hereby large phase differences. Therefore, be it by linear triangular or spherical harmonics interpolation, frequency-independent directional interpolation of the microphone signals can result either in spectral degradation or in a shift of the signal energy to higher orders; especially affecting high frequencies. In this work, an analysis method is proposed in order to decompose directional signals of any measured instrument into an interference-free primal signal and a directivity filter. Both the directivity filter and the primal source signal utilise only the short-term spectral magnitude of each microphone signal in order to avoid artefacts. The magnitudes are complemented by a simplified phase using phase-retrieval techniques
Supervisors Höldrich, R., Zotter, F.