8 research outputs found
Iglisch, Florian ; Spötl, Jakob: Soundfield Microphone: (B-Format)
No full textGraz, Univ. für Musik und darstellende Kunst, Bakkalaureatsarb., 201
An Algorithm For 1-bend Embeddings Of Planar Graphs In The Two-dimensional Grid
No full text[No abstract available]73841Liu, Y., (1995) Embeddability in Graphs, , Kluwer, AmsterdamLiu, Y., Morgana, A., Simeone, B., General theoretical results on rectilinear embeddability of graphs (1991) Acta Math. Appl. Sinica, 7, pp. 187-192Liu, Y., Morgana, A., Simeone, B., A for 2-bend embeddings of planar graphs in the two-dimensional (1998) Discrete Applied Mathematics, 81, pp. 69-9
An Algorithm For 1-bend Embeddings Of Plane Graphs In The Two-dimensional Grid
No full textIn this paper we characterize the class of plane graphs that can be embedded on the two-dimensional grid with at most one bend on each edge. In addition, we provide an algorithm that either detects a forbidden configuration or generates an embedding with at most one bend on each edge. © 2003 Elsevier B.V. All rights reserved.1411-3225241Liu, Y., (1995) Embeddability in Graphs, , Amsterdam: Kluwer Academic PublishersLiu, Y., Morgana, A., Simeone, B., General theoretical results on rectilinear embeddability of graphs (1991) Acta Math. Appl. Sinica, 7, pp. 187-192Liu, Y., Morgana, A., Simeone, B., A linear algorithm for 2-bend embeddings of planar graphs in the two-dimensional grid (1998) Discrete Appl. Math., 81, pp. 69-91Tarjan, R.E., Depth-first search and linear graph algorithms (1972) SIAM J. Comput., 1, pp. 146-16
Sonic Interaction Design: New Applications and Challenges for Interactive Sonification
No full textHermann T. Sonic Interaction Design: New Applications and Challenges for Interactive Sonification. In: Alois S, Pomberger H, Zotter F, eds. Proceedings of the 13th International Conference on Digital Audio Effects (DAFx-10). Graz, Austria: IEM; 2010: 1-2.Sonic Interaction Design (SID) is the exploitation of sound as a principal channel to convey information, meaning as well as aesthetic and emotional qualities in interactive contexts [1]. SID is a new young research field that offers novel perspectives for interactive artefacts and multimodal user interfaces that use sound at the core of their designs as means to interact with the user or to communicate and express specific facets. The COST Action IC0601 SID investigates the various aspects of sonic interaction design with the focus on (a) perception, cognition and emotion, (b) product design, (c) interactive art and (d) sonification and information display. This talk will provide an overview of SID, present examples and design procedures that take sound, its synthesis and generation, as well as our modes of communication about sound serious. Sonification is the data-dependent, reproducible generation of sound using a systematic transformation, and it is a central component to shape the functional aspect of interactive artefacts [2]
Spatial auditory display for acoustics and music collections
No full textPhDThis thesis explores how audio can be better incorporated into how people access
information and does so by developing approaches for creating three-dimensional audio
environments with low processing demands. This is done by investigating three research
questions.
Mobile applications have processor and memory requirements that restrict the
number of concurrent static or moving sound sources that can be rendered with binaural
audio. Is there a more e cient approach that is as perceptually accurate as the traditional
method? This thesis concludes that virtual Ambisonics is an ef cient and accurate means
to render a binaural auditory display consisting of noise signals placed on the horizontal
plane without head tracking. Virtual Ambisonics is then more e cient than convolution
of HRTFs if more than two sound sources are concurrently rendered or if movement of
the sources or head tracking is implemented.
Complex acoustics models require signi cant amounts of memory and processing. If
the memory and processor loads for a model are too large for a particular device, that
model cannot be interactive in real-time. What steps can be taken to allow a complex
room model to be interactive by using less memory and decreasing the computational
load? This thesis presents a new reverberation model based on hybrid reverberation
which uses a collection of B-format IRs. A new metric for determining the mixing
time of a room is developed and interpolation between early re
ections is investigated.
Though hybrid reverberation typically uses a recursive lter such as a FDN for the late
reverberation, an average late reverberation tail is instead synthesised for convolution
reverberation.
Commercial interfaces for music search and discovery use little aural information
even though the information being sought is audio. How can audio be used in
interfaces for music search and discovery? This thesis looks at 20 interfaces and
determines that several themes emerge from past interfaces. These include using a two
or three-dimensional space to explore a music collection, allowing concurrent playback of
multiple sources, and tools such as auras to control how much information is presented. A
new interface, the amblr, is developed because virtual two-dimensional spaces populated
by music have been a common approach, but not yet a perfected one. The amblr is also
interpreted as an art installation which was visited by approximately 1000 people over 5
days. The installation maps the virtual space created by the amblr to a physical space
Sound Field Radiated By A Spherical Loudspeaker Array Using A Flexible Membrane Model
No full textTwo approaches for sound field prediction of a spherical loudspeaker array operation are presented and compared to experimental measurements. In the first, real membrane modes from experimental modal analysis are used as input for BEM vibroacoustic simulations using LMS Virtual.Lab® software. In the second, an analytical solution based on the spherical harmonic expansion of an idealized velocity pattern over the spherical array is used. Results are presented in terms of sound power and directivity patterns, showing that the former has the same trend in all comparisons for the low frequency range, and that the analytical solution cannot be used for the high frequency range since it does not include the effect of the flexible membrane modes. Directivity patterns, however, show a good degree of similarity in all cases, and are not strongly affected by the flexible membrane modes.757675776Gerzon, M.A., Periphony: With-height sound reproduction (1973) Journal of the Audio Engineering Society, 21 (1), pp. 2-10Berkhout, A.J., De Vries, D., Vogel, P., Acoustic control by wave field synthesis Journal of the Acoustical Society of America, 93 (5), pp. 2764-2778Caussé, R., Bresciani, J.F., Warusfel, O., Radiation of musical instruments and control of reproduction with loudspeakers (1992) Proceedings of the International Symposium on Musical Acoustics, , Tokyo, JapanKassakian, P., Wessel, D., Characterization of spherical loudspeaker arrays (2004) Proceedings of the 117 th Audio Engineering Society Convention, , San Francisco, USA, paper number 6283Warusfel, O., Misdariis, N., Sound source radiation synthesis: From stage performance to domestic rendering (2004) Proceedings of the 116 th Audio Engineering Society Convention, , Berlin, Germany, paper number 6018Zotter, F., Sontacchi, A., Höldrich, R., Modeling a spherical loudspeaker system as multipole source (2007) Proceedings of the 33 rd German Annual Conference on Acoustics, , Stuttgart, GermanyZotter, F., (2009) Analysis and Synthesis of Sound-radiation with Spherical Arrays, , PhD dissertation, University of Music and Performing Arts, Institute of Electronic Music and Acoustics, Graz, AustriaAvizienis, R., Freed, A., Kassakian, P., Wessel, D., A compact 120 independent element spherical loudspeaker array with programmable radiation patterns (2006) Proceedings of the 120 th Audio Engineering Society Convention, , Paris, France, paper number 6783Pollow, M., Behler, G.K., Variable directivity for platonic sound sources based on spherical harmonics optimization (2009) Acta Acustica United with Acustica, 95 (6), pp. 1082-1092Pasqual, A.M., Arruda, J.R.F., Herzog, P., Application of acoustic radiation modes in the directivity control by a spherical loudspeaker array (2010) Acta Acustica United with Acustica, 96 (1), pp. 32-42Meyer, P.S., Meyer, J.D., Multi acoustic prediction program (MAPP): Recent results (2000) Tech. Rep. Presented at the Institute of Acoustics, , Meyer Sound Laboratories Inc., Stratford upon Avon, UKPasqual, A.M., (2010) Sound Directivity Control in a 3D Space by a Compact Spherical Loudspeaker Array, , PhD dissertation, State University of Campinas- Unicamp, Faculty of Mechanical Engineering, CampinasLeuridan, J., Peeters, B., Lowet, G., Van Der Auweraer, H., A new procedure for modal parameter estimation (2004) Journal of Sound and Vibration, pp. 24-28. , JanuaryVon Estorff, O., (2000) Boundary Element Acoustics- Advances & Applications, , WIT Press, Southampton (UK), 1 st Editio
The development of a design tool for 5-speaker surround sound decoders
No full textThis thesis presents the development of a software-based decoder design tool (DDT) for producing Ambisonic decoders optimised for playback over 5-speaker layouts. The research specifically focuses on developing decoders for irregular layouts with loudspeakers at a constant radial distance from the central listening position. It was motivated by the desire to provide better surround sound over the standard ITU 5-speaker layout for listeners in the sweet spot and off-centre positions. A wide-ranging literature review is presented revealing the need for such work.
The DDT employs the Tabu Search algorithm to seek improved decoder parameters according to a multi-objective fitness function. The fitness function encapsulates criteria from psychoacoustic models as a set of objectives. In order to ensure the objectives were treated equally a method known as „range-removal‟ was used for the first time in Ambisonic decoder design. A companion technique termed „importance‟ allows the systematic prioritisation of range-removed objectives giving a designer control over desired decoder criteria.
Additional elements exist in the DDT that can be turned on or off in different combinations. They include: a novel component for producing decoders with even performance by angle, a novel component for producing performance that correlates with the pattern of human spatial resolution estimated in previous Minimum Audible Angle experiments, and the ability to produce frequency dependent or independent decoders of different orders. Moreover, the user of the DDT can optimise performance for a single listener or multiple distributed listeners. To make the DDT as interactive as possible searches can optionally run on a High Performance Computer.
This thesis also details the extensive testing of Ambisonic decoders for the ITU layout. Decoders have been assessed subjectively in listening tests and objectively using binaural measurements which has verified the methods developed in this research and the DDT‟s concept. Furthermore, decoders derived by the DDT have been compared to existing decoders and the results show they give equal or better performance.
The development of a fully-functioning DDT which incorporates techniques for range-removal, importance, even performance by angle, minimum audible angle, off-centre listeners and their use in any combination represent the key outcomes of this work
