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Marc Arnela   Dr.  University Lecturer 
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Marc Arnela published an article in December 2018.
Top co-authors
Oriol Guasch

4 shared publications

GTM-Grup de recerca en Tecnologies Mèdia; La Salle-Universitat Ramon Llull; Barcelona Spain

Joan Camps

1 shared publications

18
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8
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Publication Record
Distribution of Articles published per year 
(2013 - 2018)
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8
 
Publications See all
Article 0 Reads 0 Citations Construction of an Omnidirectional Parametric Loudspeaker Consisting in a Spherical Distribution of Ultrasound Transduce... Marc Arnela, Oriol Guasch, Patricia Sánchez-Martín, Joan Cam... Published: 07 December 2018
Sensors, doi: 10.3390/s18124317
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
Omnidirectional sound sources are needed to perform a large variety of tests in acoustics. Typically, they consist of conventional speaker drivers arranged in a dodecahedron. However, the directivity of the speaker drivers sharpens with frequency, which induces an intense decrease of the sound pressure levels at the edges of the dodechaedron. In this work, the problem is mitigated by building an Omnidirectional Parametric Loudspeaker (OPL), which contains hundreds of small ultrasound transducers set on a sphere. Each transducer emits an ultrasonic carrier wave modulated by an audible signal. Thanks to nonlinear propagation, the air itself demodulates the signal bringing it back to the audible range. The construction of an OPL prototype is challenging. The structure has been built by 3D-printing a set of pieces that conform to the sphere. Each piece contains the exact location of the transducers, which are aligned in parallels to facilitate the structural assembly and the wiring. The performance of the OPL has been tested in an anechoic chamber. Measurements show that the OPL has a good omnidirectional behavior for most frequencies. It clearly improves the directivity of dodechaedral sources in the high frequency range, but performs worse at low frequencies.
PROCEEDINGS-ARTICLE 0 Reads 0 Citations Influence of tense, modal and lax phonation on the three-dimensional finite element synthesis of vowel [A] Marc Freixes, Marc Arnela, Joan Claudi Socoró, Francesc Alía... Published: 21 November 2018
IberSPEECH 2018, doi: 10.21437/iberspeech.2018-28
DOI See at publisher website
Article 0 Reads 0 Citations Reconstruction of vocal tract geometries from biomechanical simulations Saeed Dabbaghchian, Marc Arnela, Olov Engwall, Oriol Guasch Published: 14 November 2018
International Journal for Numerical Methods in Biomedical Engineering, doi: 10.1002/cnm.3159
DOI See at publisher website ABS Show/hide abstract
Medical imaging techniques are usually utilized to acquire the vocal tract geometry in 3D, which may then be used e.g., for acoustic/fluid simulation. As an alternative, such a geometry may also be acquired from a biomechanical simulation, which allows to alter the anatomy and/or articulation to study a variety of configurations. In a biomechanical model, each physical structure is described by its geometry and its properties (such as mass, stiffness, muscles, etc). In such a model, the vocal tract itself does not have an explicit representation, since it is a cavity rather than a physical structure. Instead, its geometry is defined implicitly by all the structures surrounding the cavity, and such an implicit representation may not be suitable for visualization or for acoustic/fluid simulation. In this work, we propose a method to reconstruct the vocal tract geometry at each time step during the biomechanical simulation. Complexity of the problem, which arises from model alignment artifacts, is addressed by the proposed method. In addition to the main cavity, other small cavities, including the piriform fossa, the sublingual cavity and the interdental space can be reconstructed. These cavities may appear or disappear by the position of the larynx, the mandible and the tongue. To illustrate our method, various static and temporal geometries of the vocal tract are reconstructed and visualized. As a proof of concept, the reconstructed geometries of three cardinal vowels are further used in an acoustic simulation and the corresponding transfer functions are derived.
Article 0 Reads 0 Citations Finite Element Synthesis of Diphthongs Using Tuned Two-Dimensional Vocal Tracts Marc Arnela, Oriol Guasch Published: 01 October 2017
IEEE/ACM Transactions on Audio, Speech, and Language Processing, doi: 10.1109/TASLP.2017.2735179
DOI See at publisher website
PROCEEDINGS-ARTICLE 0 Reads 1 Citation A Unified Numerical Simulation of Vowel Production That Comprises Phonation and the Emitted Sound Niyazi Cem Degirmenci, Johan Jansson, Johan Hoffman, Marc Ar... Published: 20 August 2017
Interspeech 2017, doi: 10.21437/interspeech.2017-1239
DOI See at publisher website
PROCEEDINGS-ARTICLE 0 Reads 1 Citation Synthesis of VV Utterances from Muscle Activation to Sound with a 3D Model Saeed Dabbaghchian, Marc Arnela, Olov Engwall, Oriol Guasch Published: 20 August 2017
Interspeech 2017, doi: 10.21437/interspeech.2017-1614
DOI See at publisher website
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