Matthias Frank

Matthias Frank's Home Page

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Institute of Electronic Music and Acoustics

Petersgasse 116, 8010 Graz, Austria

(+43) 316 389 3354

frank_at_iem.at

Interests & Current Work

I am currently leading the research project "Augmented Practice-Room" that aims at creating virtual concert hall acoustics inside small practice rooms.

My research interests are:

  • spatial sound reproduction and recording,
  • acoustics for virtual and augmented reality
  • psychoacoustic evaluation,
  • new evaluation methods,
  • prediction models for sound perception,
  • sound quality evaluation of non-audio products.

Publications

2021:

  • Katharina Groß-Vogt, Marian Weger, Matthias Frank, Robert Höldrich, "Peripheral Sonification by Means of Virtual Room Acoustics"., Computer Music Journal, 44(1), 71-88, April 2021.

2020:

  • Manuel Brandner, Remi Blandin, Matthias Frank, Alois Sontacchi, "A pilot study on the influence of mouth configuration and torso on singing voice directivity", The Journal of the Acoustical Society of America 148, 1169, September 2020.
  • Matthias Frank, Alois Sontacchi, "Online Seashore-Test für musikalische Begabung", Forum Neue Medien in der Lehre Austria 02/2020, July 2020.
  • Franz Zotter, Matthias Frank, "Ambisonics - das szenenbasierte 3D-Audioproduktionsformat", vdt Magazin, 3, June 2020.
  • Matthias Frank, Lisa David, "Online und zusammen", Plötzlich online, Forum Neue Medien in der Lehre Austria , June 2020.
  • Nils Meyer-Kahlen, Daniel Rudrich, Manuel Brandner, Stefan Wirler, Simon Windtner, Matthias Frank, "DIY Modifications for Acoustically Transparent Headphones", AES 148th Convention, Vienna, June 2020.
  • Lukas Gölles, Valerian Drack, Franz Zotter, Matthias Frank, "Influence of horizontal loudspeaker layout geometry on sweet area shape for widened/diffuse frontal sound", AES 148th Convention, Vienna, June 2020.
  • Matthias Frank, Daniel Rudrich, Manuel Brandner, "Augmented Practice-Room - Augmented Acoustics in Music Education", DAGA, Hannover, March 2020.
  • Manuel Brandner, Nils Meyer-Kahlen, Matthias Frank, "Directivity pattern measurement of a grand piano for augmented acoustic reality", DAGA, Hannover, March 2020.
  • Franz Zotter, Matthias Frank, Christian Schörkhuber, Robert Höldrich, "Signal-independent approach to variable-perspective (6DoF) audio rendering from simultaneous surround recordings taken at multiple perspectives", DAGA, Hannover, March 2020.
  • Kajetan Enge, Matthias Frank, Robert Höldrich, "Listening experiment on the plausibility of acoustic modeling in virtual reality", DAGA, Hannover, March 2020.
  • Markus Zaunschirm, Matthias Frank, Franz Zotter, "Binaural Rendering with Measured Room Responses: First-Order Ambisonic Microphone vs. Dummy Head", Applied Sciences, vol. 10(5), February 2020.

2019:

  • Katharina Groß-Vogt, Matthias Frank, Robert Höldrich, "Focused Audification and the optimization of its parameters" J. Multimodal User Interfaces, https://doi.org/10.1007/s12193-019-00317-8, December 2019.
  • Matthias Frank, Manuel Brandner, "Perceptual Evaluation of Spatial Resolution in Directivity Patterns 2: coincident source/listener positions", International Conference on Spatial Audio (ICSA), Ilmenau, September 2019.
  • Matthias Blochberger, Matthias Frank, Franz Zotter, "Sweet area size for the envelopment of arecursive and a non-recursive diffuseness rendering approach", International Conference on Spatial Audio (ICSA), Ilmenau, September 2019.
  • Florian Wendt, Matthias Frank, Robert Höldrich, "The role of median plane reflections in the perception of vertical auditory movement", International Congress on Acoustics (ICA), Aachen, September 2019.
  • Gerriet K. Sharma, Matthias Frank, Franz Zotter, "Evaluation of Three Auditory-Sculptural Qualities Created by an Icosahedral Loudspeaker", Applied Sciences, vol. 9(13), July 2019.
  • Neva Klanjscek, Matthias Frank, Lisa David, "“AUGMENTED PRACTICE-ROOM“: AN E-LEARNING TOOL FOR MUSIC STUDENTS", International Conference on New Horizons in Education (INTE), Prague, July 2019.
  • Franz Zotter, Matthias Frank, "Ambisonics - A Practical 3D Audio Theory for Recording, Studio Production, Sound Reinforcement, and Virtual Reality", Springer, May 2019. Link
  • Matthias Frank, Manuel Brandner, "Perceptual Evaluation of Spatial Resolution in Directivity Patterns", DAGA, Rostock, March 2019.
  • Daniel Rudrich, Matthias Frank, "Improving Externalization in Ambisonic Binaural Decoding", DAGA, Rostock, March 2019.
  • Franz Zotter, Matthias Frank, "Reproducibility of stereophonic amplitude-panning curves", DAGA, Rostock, March 2019.
  • Hannes Pomberger, Alois Sontacchi, Matthias Frank, Robert Höldrich, Thomas Gmeiner, Michele Lucchi, "Evaluating out-of-head localization of a dry source from the front reproduced with cue-preserving headphones", DAGA, Rostock, March 2019.
  • Manuel Brandner, Alois Sontacchi, Matthias Frank, "Real-Time Calculation of Frequency-Dependent Directivity Indexes in Singing", DAGA, Rostock, March 2019.
  • Markus Zaunschirm, Franz Zotter, Matthias Frank, "Perceptual Evaluation of Variable-Orientation Binaural Room Impulse Response Rendering", AES International Conference of Immersive and Interactive Audio, York, March 2019.
  • Hyunkook Lee, Matthias Frank, Franz Zotter, "Spatial and Timbral Fidelities of Binaural Ambisonics Decoders for Main Microphone Array Recordings", AES International Conference of Immersive and Interactive Audio, York, March 2019.

2018:

  • Julian Linke, Florian Wendt, Matthias Frank, Franz Zotter, "How the perception of moving sound beams is influenced by masking and reflector setup", Tonmeistertagung, Cologne, November 2018.
  • Florian Wendt, Matthias Frank, "On the localization of auditory objects created by directional sound sources in a virtual room", Tonmeistertagung, Cologne, November 2018.
  • Markus Zaunschirm, Matthias Frank, Franz Zotter, "BRIR Synthesis Using First-Order Microphone Arrays", 144th AES Convention, Milan, May 2018.
  • Thomas Deppisch, Nils Meyer-Kahlen, Franz Zotter, Matthias Frank, "Surround with Depth on First-Order Beam-Controlling Loudspeakers", 144th AES Convention, Milan, May 2018.
  • Franz Zotter, Matthias Frank, "Ambisonic Decoding with Panning-Invariant Loudness on Small Layouts (AllRAD2)", 144th AES Convention, Milan, May 2018.
  • Manuel Brandner, Matthias Frank, Daniel Rudrich, "DirPat—Database and Viewer of 2D/3D Directivity Patterns of Sound Sources and Receivers", 144th AES Convention, Milan, May 2018.
  • Matthias Frank, Franz Zotter, "Simple Reduction of Front-Back Confusion in Static Binaural Rendering", DAGA 2018, Munich, March 2018.
  • Franz Zotter, Matthias Frank, "Low-frequency trick to improve externalization with non-individual HRIRs", DAGA 2018, Munich, March 2018.
  • Hannes Pomberger, Alois Sontacchi, Matthias Frank, Thomas Gmeiner, Michele Lucchi, "Improved localization in the median plane with cue-preserving headphones", DAGA 2018, Munich, March 2018.
  • Julian Linke, Florian Wendt, Franz Zotter, Matthias Frank, "How Masking Affects Auditory Objects of Beamformed Sounds", DAGA 2018, Munich, March 2018.
  • Bartlomiej Mroz, Franz Zotter, Florian Wendt, Markus Zaunschirm, Matthias Frank, "Experiment on externalization in binaural directional-source auralization", DAGA 2018, Munich, March 2018.

2017:

  • Franz Zotter, Markus Zaunschirm, Matthias Frank, Matthias Kronlachner, "A Beamformer to Play with Wall Reflections: The Icosahedral Loudspeaker", Computer Music Journal, pp. 50–68, vol. 41(3), Fall 2017.
  • Eric Kurz, Matthias Frank, "Prediction of the listening area based on the energy vector", ICSA 2017, Graz, September 2017.
  • Michael Romanov, Franz Zotter, Matthias Frank, Chris Pike, "Comparison of spatial audio rendering systems for ITU BS2051 standard loudspeaker layouts", ICSA 2017, Graz, September 2017.
  • Matthias Frank, Alois Sontacchi, "Case Study on Ambisonics for Multi-Venue and Multi-Target Concerts and Broadcasts", Journal of the Audio Engineering Society, pp. 749–756, vol. 65(9), September 2017.
  • Florian Wendt, Franz Zotter, Matthias Frank, Robert Höldrich, "Auditory Distance Control Using a Variable-Directivity Loudspeaker", Applied Sciences vol. 7(7), June 2017.
  • Matthias Frank, Franz Zotter, "Exploring the perceptual sweet area in Ambisonics", 142th AES Convention, Berlin, May 2017.
  • Franz Zotter, Matthias Frank, "Phantom Source Widening by Filtered Sound Objects", 142th AES Convention, Berlin, May 2017.
  • Franck Zagala, Julian Linke, Franz Zotter, Matthias Frank, "Amplitude Panning between beamforming-controlled direct and reflected sound", 142th AES Convention, Berlin, May 2017.
  • Michael Romanov, Paul Berghold, Daniel Rudrich, Markus Zaunschirm, Matthias Frank, Franz Zotter, "Implementation and Evaluation of a Low-cost Head-tracker for Binaural Synthesis", 142th AES Convention, Berlin, May 2017.
  • Florian Wendt, Gerriet K. Sharma, Matthias Frank, Franz Zotter, Robert Höldrich, "Perception of Spatial Sound Phenomena Created by the Icosahedral Loudspeaker", Computer Music Journal, pp. 76–88, vol. 41(1), Spring 2017.
  • Matthias Frank, Franz Zotter, "Extension of the generalized tangent law for multiple loudspeakers", DAGA 2017, Kiel, March 2017.
  • Daniel Rudrich, Matthias Frank, Franz Zotter, "Evaluation of Interactive Localization in Virtual Acoustic Scenes", DAGA 2017, Kiel, March 2017.
  • Florian Wendt, Robert Höldrich, Matthias Frank, "The Influence of the Floor Reflection on the Perception of Sound Elevation", DAGA 2017, Kiel, March 2017.
  • Markus Zaunschirm, Christoph Baumgarnter, Christian Schörkhuber, Matthias Frank, Franz Zotter, "An Efficient Source-and-Receiver-Directional RIR Measurement Method", DAGA 2017, Kiel, March 2017.

2016:

  • Michael Romanov, Matthias Frank, Franz Zotter, Thomas Nixon, "Manipulations improving amplitude panning on small standard loudspeaker arrangements for surround with height", 29th Tonmeistertagung - VDT Int. Convention, Köln, November 2016.
  • Daniel Rudrich, Franz Zotter, Matthias Frank, "Efficient Spatial Ambisonic Effects for Live Audio", 29th Tonmeistertagung - VDT Int. Convention, Köln, November 2016.
  • Jonas Helm, Eric Kurz, Matthias Frank, "Frequency-dependent amplitude-panning curves", 29th Tonmeistertagung - VDT Int. Convention, Köln, November 2016.
  • Florian Wendt, Matthias Frank, Franz Zotter, Robert Höldrich, "Directivity Patterns Controlling the Auditory Source Distance", DAFx-16, Brno, September 2016.
  • Matthias Frank, Alois Sontacchi, Robert Höldrich, Markus Resch, Stephan Brandl, "Generating consistent exterior vehicle sound from interior sound", Inter-noise 2016, Hamburg, August 2016.
  • Matthias Frank, Franz Zotter, "Spatial impression and directional resolution in the reproduction of reverberation", DAGA 2016, Aachen, March 2016.
  • Franz Zotter, Matthias Frank, Florian Wendt, Markus Zaunschirm, "Auditory object localization of the variable-directivity icosahedral loudspeaker", DAGA 2016, Aachen, March 2016.
  • Florian Wendt, Matthias Frank, Franz Zotter, Robert Höldrich, "Influence of directivity pattern order on perceived distance", DAGA 2016, Aachen, March 2016.
  • Markus Zaunschirm, Matthias Frank, Franz Zotter, "An Interactive Virtual Icosahedral Loudspeaker Array", DAGA 2016, Aachen, March 2016.
  • Christian Schörkhuber, Matthias Frank, Franz Zotter, Robert Höldrich, Peter Grosche, "Automatic Mixing for Immersive Teleconferencing Systems", DAGA 2016, Aachen, March 2016.
  • Alois Sontacchi, Matthias Frank, Franz Zotter, Christian kranzler, and Stephan Brandl, "Sound Optimization for Downsized Engines" (Ch. 2) in "Automotive NVH Technology", Anton Fuchs, Eugenius Nijman, and Hans-Herwig Priebsch, pp. 13-27, January 2016.

2015:

  • Katharina Vogt, Matthias Frank, Robert Höldrich, "Effect of augmented audification on perception of higher statistical moments in noise", DAFx 2015, Trondheim, December 2015.
  • Matthias Frank, Gerriet K. Sharma, Franz Zotter, "What we already know about spatialization with compact spherical arrays as variable-directivity loudspeakers", inSONIC2015, Karlsruhe, November 2015.
  • Gerriet K. Sharma, Matthias Frank, Franz Zotter, "Towards understanding and verbalizing spatial sound phenomena in electronic music", inSONIC2015, Karlsruhe, November 2015.
  • Alois Sontacchi, Matthias Frank, Franz Zotter, "Advancements in 3D Audio using Ambisonics", TECNIACUSTICA'15, Valencia, October 2015.
  • Franz Zotter, Matthias Frank, "Generalized tangent law for horizontal pairwise amplitude panning", ICSA 2015, Graz, September 2015.
  • Eric Kurz, Felix Pfahler, Matthias Frank, "Comparison of first-order Ambisonic microphone arrays", ICSA 2015, Graz, September 2015.
  • Alois Sontacchi, Matthias Frank, Robert Höldrich, "In-car Active Sound Generation for enhanced feedback in vehicles with combustion engines or electric engines", Workshop on In-Vehicle Auditory Interactions at ICAD-2015, Graz, July 2015.
  • Franz Zotter, Matthias Frank, "Investigation of Auditory Objects Caused by Directional Sound Sources in Rooms", Acta Physica Polonica, pp. A5-A10, vol. 128(1A), July 2015.
  • Matthias Frank, "Simple Uncertainty Prediction for Phantom Source Localization", DAGA 2015, Nuremberg, March 2015.
  • Franz Zotter, Matthias Frank, Christian Haar, "Spherical microphone array equalization for Ambisonic playback", DAGA 2015, Nuremberg, March 2015.
  • Markus Zaunschirm, Matthias Frank, "Sound Focusing in Rooms Using a Source with Controllable Directivity", DAGA 2015, Nuremberg, March 2015.
  • Matthias Frank, Franz Zotter, Alois Sontacchi, "Producing 3D Audio in Ambisonics", AES 57th Conference on The Future of Audio Entertainment Technology, Hollywood CA, March 2015.

2014:

  • Matthias Frank, Alois Sontacchi, Stephan Brandl, Robert Höldrich, "Sound for Electric Cars: What can we learn from combustion engines?", 6th Congress of the Alps Adria Acoustics Association, Graz, October 2014.
  • Markus Zaunschirm, Matthias Frank, Alois Sontacchi, Paolo Castiglione, "Audio Quality: Comparision of PEAQ and formal listening test results", 6th Congress of the Alps Adria Acoustics Association, Graz, October 2014.
  • Matthias Frank, "How to make Ambisonics sound good", Forum Acusticum, Krakow, September 2014.
  • Franz Zotter, Matthias Frank, Andreas Fuchs, and Daniel Rudrich, "Preliminary study on the perception of orientation-changing directional sound sources in rooms", Forum Acusticum, Krakow, September 2014.
  • Gerriet K. Sharma, Franz Zotter, and Matthias Frank, "Orchestrating wall reflections in space by icosahedral loudspeaker: findings from first artistic research exploration", ICMC/SMC 2014, Athens, September 2014.
  • Georgios Marentakis, Franz Zotter, and Matthias Frank, "Vector-Base and Ambisonic Amplitude Panning: A Comparison Using Pop, Classical, and Contemporary Spatial Music", Acta Acustica united with Acustica, pp. 945-955, vol. 100(5), September/October 2014.
  • Matthias Frank, Franz Zotter, Alois Sontacchi, Stephan Brandl, and Christian Kranzler, "Comprehensive Array Measurements of In-Car Sound Field in Magnitude and Phase for Active Sound Generation and Noise Control", SAE Int. J. Passeng. Cars – Electron. Electr. Syst. vol. 7(2), August 2014.
  • Alois Sontacchi, Matthias Frank, Franz Zotter, Christian Kranzler, and Stephan Brandl, "Sound Optimization for Downsized Engines", SAE Technical Paper 2014-01-2040, June 2014.
  • Matthias Frank, "Localization Using Different Amplitude-Panning Methods in the Frontal Horizontal Plane", EAA Joint Symposium on Auralization and Ambisonics, Berlin, April 2014.
  • Franz Zotter, Matthias Frank, Matthias Kronlachner, and Jung-Woo Choi, "Efficient Phantom Source Widening and Diffuseness in Ambisonics", EAA Joint Symposium on Auralization and Ambisonics, Berlin, April 2014.
  • Matthias Frank, Franz Zotter, Hagen Wierstorf, and Sascha Spors, "Spatial Audio Rendering" (Ch. 17) in "Quality of Experience: Advanced Concepts, Applications and Methods", Sebastian Möller and Alexander Raake, pp. 247-260, March 2014.
  • Matthias Frank, "Elevation of Horizontal Phantom Sources", DAGA 2014, Oldenburg, March 2014.
  • Florian Wendt, Matthias Frank, and Franz Zotter, "Panning with Height on 2, 3, and 4 Loudspeakers", ICSA 2014, Erlangen, February 2014.

2013:

  • Matthias Frank, "Source Width of Frontal Phantom Sources: Perception, Measurement, and Modeling", Archives of Acoustics, pp. 311-319, vol. 38(3), September 2013.
  • Sascha Spors, Hagen Wierstorf, Alexander Raake, Frank Melchior, Matthias Frank, and Franz Zotter, "Spatial Sound With Loudspeakers and Its Perception: A Review of the Current State", Proceedings of the IEEE, pp. 1920-1938, vol 101(9), September 2013.
  • Franz Zotter and Matthias Frank, "Efficient Phantom Source Widening", Archives of Acoustics, pp. 27-37, vol. 38(1), March 2013.
  • Matthias Frank and Franz Zotter, "Simple technical prediction of phantom source widening", AIA-DAGA 2013, Meran, March 2013.
  • Franz Zotter, Matthias Frank, and Hannes Pomberger, "Comparison of energy-preserving and all-round Ambisonic decoders", AIA-DAGA 2013, Meran, March 2013.
  • Florian Wendt, Matthias Frank, and Franz Zotter, "Application of localization models for vertical phantom sources", AIA-DAGA 2013, Meran, March 2013.

2012:

  • Franz Zotter and Matthias Frank, "All-Round Ambisonic Panning and Decoding", Journal of the Audio Engineering Society, pp. 807-820, vol. 60(10), October 2012.
  • Matthias Frank, Alois Sontacchi, Thomas Lindenbauer, and Martin Opitz, "Subjective Sound Quality Evaluation of a Codec for Digital Wireless Transmission", AES 132nd Convention, Budapest, April 2012.
  • Matthias Frank and Alois Sontacchi, "Performance Review of an Expert Listening Panel", DAGA 2012, Darmstadt, March 2012.
  • Georgios Marentakis, Christian Kranzler, Matthias Frank, Martin Opitz, and Alois Sontacchi, "Latency tolerance enhancement in in-ear monitoring systems", DAGA 2012, Darmstadt, March 2012.

2011:

  • Sebastian Braun and Matthias Frank, "Localization of 3D Ambisonic Recordings and Ambisonic Virtual Sources", ICSA 2011, Detmold, November 2011.
  • Robert Baumgartner, Hannes Pomberger, and Matthias Frank, "Practical Implementation of Radial Filters for Ambisonic Recordings", ICSA 2011, Detmold, November 2011.
  • Franz Zotter, Matthias Frank, Georgios Marentakis, and Alois Sontacchi, "Phantom Source Widening with Deterministic Frequency Dependent Time Delays", DAFx-11, Paris, September 2011.
  • Matthias Frank, "Panning Phantom Sources with Ambisonics", AES 130th Convention, London, May 2011.
  • Matthias Frank, Georgios Marentakis, and Alois Sontacchi, "A simple technical measure for the perceived source width", DAGA 2011, Düsseldorf, March 2011.

2010:

  • Matthias Frank, "LAWO mc² and Spatial Sound Reproduction at the IEM", 5th International mc² User Meeting 2010, LAWO AG, Rastatt, September 2010.
  • Franz Zotter, Matthias Frank, and Alois Sontacchi, "The Virtual T-Design Ambisonics-Rig using VBAP", EAA Euroregio 2010, Ljubljana, September 2010.
  • Matthias Frank, Ludwig Mohr, Alois Sontacchi, and Franz Zotter, "Flexible and intuitive pointing method for 3D auditory localization experiments", AES 38th International Conference, Pitea, June 2010.
  • Matthias Frank, Alois Sontacchi, and Robert Höldrich, "Training and Guidance Tool for Listening Panels", DAGA 2010, Berlin, March 2010.

<2010:

  • Franz Zotter, Hannes Pomberger, and Matthias Frank, "An Alternative Ambisonics Formulation: Modal Source Strength Matching and the Effect of Spatial Aliasing", 126th AES Convention, Munich, May 2009.
  • Matthias Frank, Franz Zotter, and Alois Sontacchi, "Localization Experiments Using Different 2D Ambisonics Decoders", 25th VDT International Convention, Leipzig, November 2008.

Theses

  • Matthias Frank, "Phantom Sources using Multiple Loudspeakers in the Horizontal Plane", PhD thesis, Institute of Electronic Music and Acoustics, University of Music and Performing Arts Graz, 2013. pdf
  • Matthias Frank, "Vergleich von Schallfeldreproduktionsverfahren unterschiedlicher räumlicher Bandbreite", diploma thesis, Institute of Electronic Music and Acoustics, University of Music and Performing Arts Graz, 2009. pdf

Teaching

Advised Students' Works

Diploma/Master's theses:

  • Sebastian Preis, "Richtungshörmodell mit Elevation und Korrektur der Mehrdeutigkeiten", 2011. Abstract/PDF
  • Florian Wendt, "Untersuchung von Phantomschallquellen vertikaler Lautsprecheranordnungen", 2013. Abstract/PDF
  • Michael Romanov, "Comparison of amplitude panning approaches on ITU-R BS.2051 loudspeaker layouts with height", 2018.
  • Eric Kurz, "Efficient prediction of the listening area for plausible reproduction", 2018.
  • Clemens Markart, "Musikproduktion in Ambisonics: Welchen Mehrwert verspricht Ambisonics in der modernen Musikproduktion?", 2019.
  • Kajetan Enge, "Listening experiment on the plausibility of acoustic modeling in virtual reality", 2020.

"Toningenieur" projects:

  • Ludwig Mohr, "Weiterentwicklung und Evaluierung der Genauigkeit eines Messystems für 3D Lokalisationsversuche", 2010. Abstract/PDF
  • Martina Kreuzbichler, "Framework for Modeling Forced-Choice Experiments in the Auditory Modeling Toolbox", 2016.
  • Eric Kurz, "Vorhersage des Hörbereichs für Surround-Wiedergabesysteme auf Basis des Energievektormodells", 2017.
  • Bernhard Zeller, "Bestimmung von Lautsprecherpositionen und Raumgeometrien mithilfe der Spatial Decomposition Method", 2018.
  • Katharina Pollack, "Evaluierung der photogrammetrischen Rekonstruktion für numerische Berechnung von HRTFs", 2019.
  • Nils Meyer-Kahlen, "Surround Playbacl on the Icosahedral Loudspeaker", 2019.
  • Julian Linke, "Hörversuche zu Klangskulpturen mit dem Ikosaederlautsprecher", 2019.
  • Thomas Deppisch, "Plug-In for Frequency-Dependent Control of Microphone Polar Patterns", 2020.
  • Elias Hoffbauer, "Development and Evaluation of an Algorithm for the Enhancement of First-Order Ambisonic Impulse Responses", 2021.
  • Simon Beck, Samuel Maurer, "Automatic DOA estimator for spatial music recordings", 2021.