Thesis

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Die Ludische Komposition - Vorstellung einer spielbasierten Form der Interaktivität in der Musik

Authors Scholz, S.
Year 2020
Thesis Type Bachelor's thesis
Topic Algorithmic Composition
Keywords Algorithmische Komposition, Installation, Computer Music
URL https://phaidra.kug.ac.at/o:106198.
Supervisors Ciciliani, M.
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Repeated Pitch-shifting for Frequency Discretization as an Artistic Effect for Speech Signals

Authors Planton, M.
Year 2020
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Keywords Computermusic and Elektronic Music, frequency estimation, sound synthesis
Abstract Pitch-shifting effects have been used for a long time, but there are still new innovations to the employed algorithms for fundamental tone analysis (pitch-tracking) and synthesis of a frequency shifted audio signal (pitch-shifting). This project starts with the research on the contemporary pitch-tracking and pitch-shifting algorithms literature, to develop a frequency discretizing pitch-shifting algorithm for monophonic speech signals. Strategies and techniques of the specific design for the effects implementation are discussed. Finally the artistic potential of the effect is evaluated in several applications. So a monophonic speech signal is discretized according to certain pitch scales. The center of this study is the outcome of the repeated application of this audio effect and which possibilities it offers.
Supervisors Höldrich, R.
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Automatic DOA estimator for spatial music recordings

Authors Maurer, S., Beck, S.
Year 2020
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Keywords 3D sound, Ambisonics, B-format, Higher-Order Ambisonics (HOA), microphone arrays, signal processing, Spatial Audio, Software
Abstract The orientation in a room and its parameters are important knowledge when it comes to ambisonic musical performances. In this project an audio plug-in is developed which enables performers to estimate the position of their instruments in a room related to an ambisonic microphone array. Two different approaches of this task will be examined. Both are based on the same idea of building an intensity vector for determining the direction of arrival of the sound sources. One approach is to calculate the intensity vector of the whole array signal in the frequency domain which is filtered with a mask to separate the different instrument signals. The second approach is to calculate the intensity vector of an ambisonic room impulse response. The room impulse response is extracted from the musical signals with the help of a LMS-algorithm. With this room impulse response it is also possible to find room parameters like reverberation time and the dimensions of the room. Since it is a difficult task to make a stable and real time compatible algorithm for this, it will not find place in the plug-in but different methods to determine those parameters will be evaluated.
Supervisors Frank, M., Rudrich, D.
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Multi-Perspective Scene Analysis from Tetrahedral Microphone Recordings

Authors Blochberger, M.
Year 2020
Thesis Type Master's thesis
Topic Spatial Audio
Keywords audio recording and reproduction, B-format, Higher-Order Ambisonics (HOA), signal processing, Spatial Audio
Abstract Convincing immersion in virtual reality requires to enable the user to engage in interactive listening within three-dimensional audio scenes. To achieve a realistic listening experience, the acoustic perspective and orientation has to be real-time controlled with the own body movements. This thesis addresses the task of presenting an interpolated variable perspective to an interacting listener, while the original audio scene is recorded simultaneously at only a few static perspectives. The scene is decomposed into localizable sound objects and a residual signal for the variable-perspective interpolation. Information regarding localizable objects is extracted from a probability map that is composed from the directions detected by the collective of the available single perspectives. This work proposes a particle-filter-based approach for a continuous position estimation of sound objects. The particle filter uses the probability map to estimate a continuous trajectory for each sound object in the scene. The rendering approach extracts signals from the recording for each localized sound object according to its estimated trajectory and embeds it relative to the virtual listener into the residual signal.
URL https://phaidra.kug.ac.at/o:104549
Supervisors Zotter, F., Höldrich, R.
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Der Einsatz von konkretem Klangmaterial in unterschiedlichen musikalischen Kontexten, ausgehend von Pierre Schaeffers „Musique concrète“

Authors Müller, L.
Year 2020
Thesis Type Bachelor's thesis
Topic Sound and Space
URL https://phaidra.kug.ac.at/o:108507
Supervisors Eckel, G.
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Fast measurement of HRTFs in a loudspeaker-array system

Authors Blöcher, C.
Year 2020
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Keywords HRTF Measurement, Music Information Retrieval, binaural
Supervisors Sontacchi, A., Majdak, P.
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EarSCAPE

Authors Cladders, J.
Year 2020
Thesis Type Bachelor's thesis
Topic Spatial Audio
Keywords Audio, binaural, Spatial Audio, Game
Abstract EarSCAPE is an audio-game in the genre of so called escape games. Usually the player has to succeed in di erent tasks to nally escape from one or more rooms. In EarSCAPE the player is trapped in a single room with only one exit and has to follow di erent auditive cues to successfully escape the room within a given time. There is no visual support. The auditive orientation is based on binaural spatialization using Head Related Transfer Functions (HRTFs), so the use of headphones is obligatory. The implementation was done in Pure Data (Pd) in a way, that it is accessible to the user to create own levels by placing audio events in a room and assigning own samples to it. For its non-visual output, the game is also playable for people without the ability to see.
URL https://phaidra.kug.ac.at/o:108229
Supervisors Zmölnig, J.
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3D Audio Sound Branding

Authors Sternbauer, M.
Year 2020
Thesis Type Master's thesis
Topic Audio Signal Processing
Abstract Recent developments in 3D audio technology have not only attracted more attention from a broader audience, but also enable easier integration into everyday life. This applies to both binaural playback and the 3D audio speaker systems. Furthermore, it creates the opportunity for acoustic brand communication (sound branding) to establish a new touchpoint and experience for customers. This master thesis explores the creative possibilities and difficulties that emerge. In the theoretical part the directional and distance perception of the human hearing system is explained in acoustic and psychoacoustic terms. The visual component in hearing perception is also addressed. In the practical part the production process of several sound logos for the IKO, a 20-sided speaker system, is documented. Different movement patterns and sound objects were created using typical sound materials. These were examined by test persons for their comprehensibility and impact. The listening tests confirm not only a spectral dependency in the localization but also differences in the perception of the spatial dimension. Besides certain design criteria, factors influencing the subjective assessment could also be found. In addition, the influence of visual cues on more complex auditory objects is confirmed.
URL https://phaidra.kug.ac.at/o:108231
Supervisors Sontacchi, A.
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Exemplarische Untersuchung eines Quellseparationsalgorithmus

Authors Kaiser, L.
Year 2020
Thesis Type Bachelor's thesis
Topic Audio Signal Processing
Keywords Music Information Retrieval, signal processing, Software
URL https://phaidra.kug.ac.at/o:108230
Supervisors Sontacchi, A.
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Development and Evaluation of an Algorithm for the Enhancement of First-Order Ambisonic Impulse Responses

Authors Hoffbauer, E.
Year 2020
Thesis Type Audio Engineering project
Topic Spatial Audio
Keywords Ambisonics, B-format, Higher-Order Ambisonics (HOA), microphone arrays
Abstract follows
Supervisors Frank, M.
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Spherical-harmonic representation in the spatially oriented format for acoustics (SOFA)

Authors Perfler, F.
Year 2020
Thesis Type Audio Engineering project
Topic Spatial Audio
Keywords 3D sound, Higher-Order Ambisonics (HOA), acoustics, spherical harmonics, acoustic source localization
Abstract follows
Supervisors Sontacchi, A., Majdak, P.
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Akustische Untersuchung von Aktoren als Lautsprecherersatz im Fahrzeughimmel

Authors Kocher, L.
Year 2020
Thesis Type Master's thesis
Topic Spatial Audio
Keywords psychoacoustics, 3D sound
Abstract follows
Supervisors Frank, M., Höldrich, R.
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New Multi-Touch Instrument With Visual Feedback

Authors Bradl, H.
Year 2020
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Keywords freie Tonskalen, Computer Music, Computermusic and Elektronic Music, sound synthesis
Abstract The aim of this project is the development of a polyphonic multi-touch instrument which is not limited to a traditional twelve-tone scale. Instead it should allow scales with freely selectable resolution, i.e. notes per octave. Since it's not possible to apply classical music theory when using alternative scales, the instrument should give the musician visual hints which note combinations could make sense.
Supervisors Zotter, F.
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Materiality as a perspective for artistic experimentation

Authors Iadema, G.
Year 2020
Thesis Type Bachelor's thesis
Topic Sound and Space
Keywords audiovisuell, Computer Music
Abstract This paper proposes a conception of materiality as a perspective for artistic experimentation. It centres on a discussion of a different understanding of the role of materiality in artistic practices. A central point of discussion is the concept of “Absent Matter”, in relation to my project Un_inverso, following the idea of the designer and artist Edoardo Tresoldi. This text aims to present a direct relationship between the concept of matter and the aesthetic of imperfection, more specifically the post glitch aesthetics, by using a comprehensive analysis of the project mentioned above, placed in a larger context. The idea of materiality is applied also to sounds, supported by the drawing on the Heideggerian concept of the thing, outlining a conception of sound as a non-symbolic thing. The proposed idea finds a connection also from an aesthetic point of view. In fact, the use of a glitch aesthetic suggests an idea of transparency, in which the potential and "failures" of technology appears more clearly. They are reflected in basic sounds (click, noise, sinusoids), in direct dialogue with the constituent elements of the project Un_inverso. They are represented by video content and a series of wire mesh models, which have two levels of reading: as constituent elements of architecture (for example, the pillars as regards real models and architectural drawings as regards videos) or as models of complete buildings.
URL https://phaidra.kug.ac.at/o:104785
Supervisors Ciciliani, M.
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Composing and Performing With and Within Feedback Systems

Authors Borsetto, T.
Year 2020
Thesis Type Bachelor's thesis
Topic Sound and Space
Abstract In this thesis I aim at outlining a model of computer music composition as inextricably intertwined with performance and intrinsically bound to the generative qualities of the machine. These qualities are prominent in some specific configurations, for instance in feedback systems. As will be discussed, they appear to be both the cause and the consequence of some specific properties: emergence, non-linearity, complexity and self-organization. My approach is based on the inclusion of these contingencies in the process of composition. As I shall demonstrate, two key elements in this model of computer music composition are the design of the interaction between human and machine, and the mutuality of this interaction, that is the bidirectionality of the exchange of information between the agents. I shall investigate the human, the machine and the bond between them, shaping a narrative along the lines of three key concepts, that are introduced in the very title: composing and performing , with and within and feedback systems .
URL https://phaidra.kug.ac.at/o:104741
Supervisors Eckel, G.
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Welt im Klang: Klangrealitäten und die Entwicklung einer globalen Kompositionspraxis

Authors Bold, J.
Year 2020
Thesis Type Bachelor's thesis
Topic Sound and Space
URL https://phaidra.kug.ac.at/o:104738
Supervisors Eckel, G.
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Street Sound Art

Authors Thomann, I.
Year 2020
Thesis Type Bachelor's thesis
Topic Sound and Space
URL https://phaidra.kug.ac.at/o:104712
Supervisors Eckel, G.
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Block-oriented modeling of nonlinearities in electro-acoustical transducers

Authors Glattfelder, K.
Year 2020
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Keywords audio recording and reproduction, signal processing
Abstract Electro-acoustical transducers, or simply speakers and microphones, are essentially omnipresent throughout everybody's life. The properties and behaviors of these transducers can be analyzed and identified to create models which are used to further refine the quality of the sound or to digitally simulate the identified speaker (e.g. the cabinet of a guitar amplifier with its distinctive sound). One particular aspect of the transducer is its nonlinear behavior, that tends to be especially prominent when operating the speaker at high sound pressure levels (high displacement of the membrane). This “distortion” diminishes the sound quality and can create additional harmonic components that were not originally part of the signal. Although the total amount of the harmonic distortion can be quantified, it is not possible to further characterize the distortion with the conventional identification processes since they only capture the linear behavior. The goal of the current study is creating a python script for block-oriented modeling of nonlinearities in electro-acoustical transducers with Wiener or Hammerstein systems.
Supervisors Höldrich, R.
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Analysis and visualization of bell-ringing

Authors Holzmüller, F.
Year 2020
Thesis Type Audio Engineering project
Topic Audio Signal Processing
Abstract Bell-ringing is a fundamental part of ecclesiastical rites. The aim of this interdisciplinary project involving the long night of churches and the Akademie Graz is to provide a visualization of peal, especially for hearing impaired persons. In a first step, an analysis tool is created. Therefore spectral and temporal features are analyzed including fundamental frequency, harmonic structure, rhythmical motives and dynamic progression. In a next step, a real-time visualization based upon the found parameters is created. A realization of this project is planned for the next long night of churches in Graz.
Supervisors Sontacchi, A.
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Sensor shield and fusion algorithm evaluation of DIY Attitude and Heading Reference Systems (AHRS)

Authors Berghold, P.
Year 2020
Thesis Type Audio Engineering project
Topic Spatial Audio
Keywords 3D sound, Ambisonics, binaural, Hardware, Human Computer Interaction (HCI), Motion Capture, signal processing
Abstract Head orientation estimation is an important task for plausible perception of virtual acoustics. To gain a reliable 3D acoustic scene via headphone playback, tracking of the listener's head movements is a necessary feature. Micro Electro Mechanical Systems (MEMS) oer a cheap and su cient possibility to track such movements, but lack in accuracy. This work evaluates state of the art sensor shields (BNO055, NXP 9DOF and MPU9250) and fusion algorithms for the de- sign of an attitude and heading reference system (AHRS) on the Arduino platform. The orientation estimation of the sensors is compared to an optical tracking system (Optitrack Flex 13). It is shown that all sensors can achieve su cient orientation estimation with the right fusion algorithm and proper calibration. Their perfor- mance diers in the robustness against magnetic distortions and gyroscope bias drift. Nevertheless the BNO sensor outperforms the others with its ease of use as it has an onboard sensor fusion.
URL https://phaidra.kug.ac.at/o:108232
Supervisors Rudrich, D.
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Kommunizieren mit Stille

Authors Breuner, E.
Year 2020
Thesis Type Master's thesis
Topic Sound and Space
Keywords Sound Design, sparsity
Supervisors Ciciliani, M., Groß-Vogt, K.
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Line-source loudspeaker arrays for immersive sound reinforcement

Authors Gölles, L.
Year 2020
Thesis Type Master's thesis
Topic Spatial Audio
Keywords acoustics, Ambisonics, directivity, Spatial Audio, audio reproduction
Abstract The properties of sound systems for three-dimensional sound material are already relatively well understood, as long as the size of the audience remains manageable, i.e. up to about 200 people. For example, the sweet area size for Ambisonic playback systems as usable audience area was examined for direct sound and reverberation. However, such sound systems are already reaching their limits. The sound propagation over longer distances are hardly taken into account by the know studies. According to the current state of the art, sound transmission over large distances is mostly solved by the use of a progressively curved line-source loudspeaker array. This thesis deals with the realization of optimally curved line-source loudspeaker arrays for immersive sound reinforcement in order to guarantee an optimally enveloping/immersive soundscape for the majority of the audience. To this end, this work elaborates a theory of optimally curved line source arrays at different heights and investigates the achievable sound pressure level contour depending on the distance, on the one end. On the other hand, the new theory is evaluated in concluding practical experiments.
Supervisors Zotter, F., Höldrich, R.
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Die gestaltete Schallwelt der Stadt Ein Leitfaden zur nachhaltigen, akustischen Raumplanung

Authors Quade, V.
Year 2020
Thesis Type Master's thesis
Topic Sound and Space
Abstract The acoustic urban space was completely neglected in terms of design just until a few years ago. Although noise control measures are ordered after technical noise measurements, they are not always meaningful for a balanced urban space and often complicate construction considerably. The sustainable soundscape of our future cities is a complex system of physical building measures, traffic planning, individual needs of the residents and the resulting psychoacoustic adjustments of the environment. This work intertwines the components of the system into a guide for those who want to build or approve the city of the future.
URL https://phaidra.kug.ac.at/o:106250
Supervisors Gründler, J.
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EFFEX Sequencer - Implementierung und Erweiterungen von zugrundeliegenden Prinzipien

Authors Wolff, P.
Year 2020
Thesis Type Master's thesis
Topic Sound and Space
Abstract A central approach of the 20th century composition was the creation of new sounds and to expand existing ones. This was achieved by extended playing techniques, prepared instruments and the use of non-traditional equipment. According to this the aesthetic changed. For the first time in history noise was considered as an adequate musical material. Such developments are directly related to technical achievements. They bring along new sounds, ways of thinking, and new genres, as well as new instruments. One example are sequencers, who play an important role in different fields of electronic music. They use internal principles such as repetition, which also represents an essential element of various musical cultures and genres. Within the development of the EFFEX sequencer, attempts were made to pick up underlying functions and limitations of sequencer systems, and alter them by various implementations, such as random operations or expanding the flexibility of rhythmical possibilities. As a result, not only interesting sounds should occur, but also unfamiliar musical structures.
URL https://phaidra.kug.ac.at/o:106249
Supervisors Eckel, G.
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Räumliche Repräsentation - Untersuchung diverser Implementierungsansätze

Authors Seddiki, N.
Year 2019
Thesis Type Bachelor's thesis
Topic Audio Signal Processing
Keywords signal processing, Spatial Audio, acoustics
Abstract Räumliche Repräsentation stellt oftmals noch immer eine großen Rechenaufwand dar. Diese Arbeit beschäftigt sich mit unterschiedlichen Implementierungsansätzen wie FIR-Filter, uniforme und non-uniforme Faltungsalgorithmen in Hinblick auf Performance und Komplexität.
URL https://phaidra.kug.ac.at/o:96791
Supervisors Sontacchi, A.