zotter's Home Page

zotter Assistant Professor
Tel.: ++43/316/389-3382
Fax: ++43/316/389-3171
E-mail: zotter__at__iem.at
ORCID: https://orcid.org/0000-0002-6201-1106
RG: https://www.researchgate.net/profile/Franz_Zotter
CV: https://iaem.at/Members/zotter/cv_zotter.pdf

interests & current work

I am chair of the TC "Virtuelle Akustik" within DEGA (co-chairs Prof. Stefan Weinzierl, Prof. Sascha Spors, Prof. Bernhard Seeber). Check out our open data, the Student 3D Audio Production Competition, the IEM Plugins, the OSIL project, the IKO, IEM loudspeaker cubes, and plenaudio walkthrough

My interests are:

  • compact spherical loudspeaker arrays (sound-radiation synthesis)
  • acoustic holography and holophony lecture(requires kunstuni-login)
  • vibration and radiation in the spherical sound field
  • surrounding spherical microphone arrays (sound-radiation capture/analysis)
  • surrounding spherical loudspeaker arrays (Ambisonics)
  • source-and-receiver-directional (SRD) room impulse responses (RIRs), 5D
  • variable-perspective recording and playback
  • perception of beamformed sounds
  • source widening algorithms
  • sound reinforcement
  • building phsyics

publications in 2020/21

  • Matthias Blochberger, Franz Zotter, "Particle-filter tracking of sounds for frequency-independent 3D audio rendering from distributed B-format recordings", Acta Acustica, https://doi.org/10.1051/aacus/2021012, 2021.
  • Kaspar Müller, Franz Zotter, "Auralization based on multi-perspective ambisonic room impulse responses", Acta Acustica, https://doi.org/10.1051/aacus/2020024, 2020.
  • Lukas Gölles, Franz Zotter, "Directional Enhancement of First-Order Ambisonic Room Impulse Responses By The 2+2 Directional Signal Estimator", Audiomostly, Graz, Sept., [pdf], 2020.
  • Lukas Gölles, Valerian Drack, Franz Zotter, Matthias Frank, "Influence of horizontal loudspeaker layout geometry on sweet area shape for widened/diffuse frontal sound", 148th AES, VV, 2020.
  • Valerian Drack, Franz Zotter, "A personal, 3D-printable compact spherical loudspeaker array", AES VV Conv, E-Brief 607, [pdf], 2020.
  • Markus Zaunschirm, Franck Zagala, Franz Zotter, "Auralization of Higher-Order Directional Sources from First-Order RIR Measurements", MDPI Appl. Sc., 10(11), [pdf], 2020.
  • Byeongho Jo, Franz Zotter, Jung-Woo Choi, "Extended Vector-Based EB-ESPRIT Method", IEEE TASL, vol 28, [pdf], 2020.
  • Christian Schörkhuber, Robert Höldrich, Franz Zotter, "Triplet-based variable-perspective (6DoF) audio rendering from simultaneous recordings taken at multiple perspectives", Fortschritte der Akustik - DAGA, [pdf], 2020.
  • Franz Zotter, Matthias Frank, Christian Schörkhuber, Robert Höldrich, "Signal-independent approach to variable-perspective (6DoF) audio rendering from simultaneous recordings taken at multiple perspectives", Fortschritte der Akustik - DAGA,  [pdf], 2020.
  • Markus Zaunschirm, Matthias Frank, Franz Zotter, "Binaural Rendering with measured room responses: first-order Ambisonic microphone vs. dummy head", MDPI Appl. Sc., 10(5), [pdf], 2020.


  • Franz Zotter, "Analysis and Synthesis of Sound-Radiation with Spherical Arrays", Doctoral Thesis, Institute of Electronic Music and Acoustics, University of Music and Performing Arts Graz, [pdf] [pdf], 2009.
  • Diplomarbeit: "Unterdrückung hörbarer Störgeräusche in Echtzeitsystemen", [pdf], 2004.


Lecture on "5D" room impulse responses [zip:ppt]. ERASMUS-TA, ITA, RTWH-Aachen, Gradientenmikrofone hoher Ordnung, in Elektroakustik / akustische Messtechnik, [pdf], Jan., 2012. ERASMUS-TA, Fachgebiet Audiokommunikation, TU-Berlin, Virtuelle Akustik: Holografie mit dem Rayleighintegral, sphärische Holografie/Holofonie, Jun., 2012.
Acoustic Holography and Holophony (Lecture):
W1011, W1112, W1213, W1314, W1415, W1516(with video lectures), W1617
(now) Fundamentals of immersive 3D Audio Technology (Lecture):
W1718, (Ambisonics Book 2019), sinceW1920

Algorithms in Acoustics and Computer Music 2 (Lab/Seminar):
S08, W0809, W0910, W1011, W1112, W1213, W1314, W1516, W1617, W1718, W1819, W2021

Acoustic Holography and Holophony / Acoustic Measurement Techniques 2 (Workshop):
S08, S09, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20

Sound Reinforcement / Beschallungstechnik (Lecture/Workshop):
S19, S20, sinceS21

Schallschutz und Lärm (was Bauphysik und Lärm) (Lecture/Exercise):

advised students' works

Master/Diploma theses:

  • Lukas Gölles, "Optimally Curved Arc Source for Sound Reinforcement", M Thesis, 2021.
  • Thomas Deppisch, "Multi-direction analysis in Ambisonics", M Thesis, https://phaidra.kug.ac.at/o:108536, 2020.
  • Matthias Blochberger, "Multi-perspective scene analysis from tetrahedral microphone recordings", M Thesis, https://phaidra.kug.ac.at/o:104549, 2020.
  • Elisabeth Frauscher, "Perceptually motivated ambient scene recording and parametric source embedding", M Thesis,  https://phaidra.kug.ac.at/o:104551, 2020.
  • Kaspar Müller, "Variable-perspective rendering of virtual acoustic environments based on distributed first-order room impulse responses", M Thesis, 2020.
  • Manuel Pagavino, "Derivative-based regularization of inverse problems in acoustic holography", M Thesis, http://phaidra.kug.ac.at/o:92568, 2019.
  • Franck Zagala, "Optimum-phase primal signal and radiation-filter modelling of musical instruments", M Thesis, https://phaidra.kug.ac.at/o:79029, 2019.
  • Stefan Riedel, "Compact spherical loudspeaker arrays: new filter and layout ideas", M Thesis, https://phaidra.kug.ac.at/o:91865, 2019.
  • Michael Romanov, ",Comparison of amplitude panning approaches on ITU-R BS.2051 loudspeaker layouts with height", M Thesis 2017.
  • Patrick Ziegler, "Joint single-channel speech dereverberation", M Thesis, [pdf], 2016.
  • Christian Haar. "Analysis of Room Impulse Responses Measured with Compact Spherical Microphone and Loudspeaker Arrays", M. Thesis, ITA, RWTH-Aachen, 2016.
  • Annika Neidhardt. "Untersuchung zur räumlichen Genauigkeit bei der binauralen Auralisation von Kugelarraydaten", [pdf], 2015.
  • Philipp Alexaner Hack. "Multiple Source Localization with Distributed Tetrahedral Microphone Arrays", [pdf], 2015. (WKO Scholarship 2014)
  • Ben-Daniel Keller. "Development of a Sound Projection Prototype", [pdf], 2015. (WKO Scholarship 2014, DEGA Student Grant 2015, DAGA Poster Award 2015)
  • Juan Andrés Ureta Staackmann. "Simulation of Room Transfer Functions With Directivity Patterns On The Basis Of Room Modes", [pdf], 2014.
  • Stefan Lösler. "MIMO-Rekursivfilter für Kugelarrays", [pdf], 2014. (DEGA Student Grant 2015, DAGA Poster Award 2015)
  • Matthias Kronlachner. "Spatial Transformations for the Alteration of Ambisonic Recordings", [pdf], 2014. (Gold in AES Student Design Competition 2014)
  • Ander Gaspar Perez Palacios. "Measurement and evaluation of room impulse response measurements performed with a flexible highly directive source", thesis in collaboration with ITA RWTH-Aachen, [pdf], 2014
  • Clara Hollomey. "Real-Time Spectrogram Inversion – Retrieving Primal Signals", [pdf], 2014.
  • Florian Wendt. "Untersuchung von Phantomschallquellen vertikaler Lautsprecheranordnungen", [pdf], 2013.
  • Florian Pausch. "A Rigid Double Cone Microphone Array Prototype", [pdf], 2013. (Gold in AES Student Design Competition 2013)
  • Philipp Schmidt. "Improvements in Localisation of Planar Acoustic Holography", [pdf], 2012. (DEGA student Prize 2014)
  • Fabio Kaiser. "Modal Analysis of Rigid Microphone Arrays using Boundary Elements", [pdf], 2012.
  • Markus Zaunschirm."Modal beamforming using planar circular microphone arrays", 2012.
  • Johannes Zaar. "Phase Unwrapping for Spherical Interpolation of Head-Related Transfer Functions", [pdf], 2011.
  • Nadine Kroher. "Acoustic feedbacks of loudspeaker-room-microphone environments with directivity", [pdf], 2011.
  • Ralf Baumgartner. "Time Domain Fast-Multipole Translation for Ambisonics", [pdf], 2011.
  • Thomas Kößler. "Kugelkappenförmige Mikrofonanordnung zur 3-dimensionalen Erfassung des Schallfeldes", [pdf], 2011.
  • Sebastian Preis. "Richtungshörmodell mit Elevation und Korrektur der Mehrdeutigkeiten", [pdf], 2011.
  • Wolfgang Nemitz. "Simulation and design of a measurement tube for microphones", [to pdf], 2010.
  • Daniel Deboy. "Acoustic Centering and Rotational Tracking in Surrounding Spherical Microphone Arrays", [pdf], 2010. (DEGA Student Prize 2011)
  • Michael Kerscher. "Compact Spherical Loudspeaker Array for Variable Sound-Radiation", [pdf], 2010.
  • Peter Plessas. "Rigid sphere microphone arrays for spatial recording and holography", [to pdf], 2009.
  • Fabian Hohl. "Kugelmikrofonarray zur Abstrahlungsvermessung von Musikinstrumenten", [to pdf], 2009.
  • Matthias Frank. "Perzeptiver Vergleich von Schallfeldreproduktionsverfahren unterschiedlicher räumlicher Bandbreite", [to pdf], 2009.
  • Hannes Pomberger. "Angular and Radial Directivity Control for Spherical Loudspeaker Arrays", [pdf], 2008.
  • Daniel Hofer. "Implementierung eines 64 Kanal Mikrofonarrays", [to pdf], 2008.

"Toningenieur" projects:

  • Hannes Bradl, "Neues Multi-Touch-Instrument mit visuellem Feedback", https://phaidra.kug.ac.at/o:114831, 2021.
  • Lukas Gölles, "Richtungsschärfung in ambisonischen Raumimpulsantworten erster Ordnung durch den 2+2 Richtungssignalschätzer", 2020.
  • Manuel Pagavino, "Alternative discretizations for the numerical evaluation of Rayleigh’s integral based on Fourier acoustics", 2019.
  • Tim Raspel, "Vector-Base Amplitude Panning - VST Plugin Implementation", [pdf], 2017.
  • Sebastian Grill, "VST-Implementierung Ambisonischer Nachhalleffekte", [pdf], 2017.
  • Rainer Mittmannsgruber. "Adaptive MISO-Filter zur möglichst konstruktiven
    Mehrkanalsignalüberlagerung", [pdf], 2016.
  • Patrick Ziegler. "Studie zur Anwendung von DirAC höherer Ordnung auf Eigenmikesignale", [pdf], 2016.
  • Stefan Lösler. "Schallfeldspezifische Entzerrung bei Radialfiltern begrenzter Dynamik für das Eigenmike", [pdf], 2013.
  • Sebastian Süss. "Auffinden von Ursignalen aus Aufnahmen umgebender kugelförmiger Mikrofonanordnungen", [to pdf], 2011.
  • Johannes Zaar. "Vermessung von Außenorhübertragungsfunktionen mit reziproker Messmethode", [pdf], 2010.
  • Stefan Richardt. "Implementierung eines Modells zur Messung und Darstellung binauraler Lokalisation (Implementation of a model for measuring and illustrating binaural sound localization)", [pdf], 2010.
  • Christian Siller. "Beamforming mit einem Miniatur-Line-Arrays", [pdf], 2010.
  • Sebastian Rieck. "Implementierung einer Ausfallsverschleierung mittels spektraler Signalmodellierung", [pdf], 2009.
  • Georg Koller. "Verbesserung der virtuellen Akustik für Kopfhörer durch Berücksichtigung von Schulterdrehungen relativ zum Kopf", [pdf], 2008.
  • Matthias Frank. "Hörversuch zur Lokalisation bei verschiedenen Ambisonics-Decodern", [pdf], 2008.
  • Margherita Jammer. "Modeling sounds of Gamelan Instruments with Exponentially Decaying Sinusoids", [pdf], 2008.
  • Fabian Hohl. "Sound and Radiation Analysis of Multichannel Gamelan Sound Samples", [pdf], 2008.
  • Peter Reiner, Christian Jochum. "Measurement and Evaluation of Crosstalk within an Icosehedral Loudspeaker Array", [pdf], 2007.
  • Christian Jochum, Peter Reiner. "Driving Filters for the Icosahedral Louspeaker Array", [pdf], 2007.

Bachelorarbeit (Betreuer: Alois Sontacchi)

  • Robert Baumgartner, Elmar Messner. "Auswirkung der Abstrahlcharakteristik auf die Klangfarbe von Querflöten und Saxofonen", [to pdf], 2010.