Nikolaos Stefanakis, PhD
About me:
Since March 2018 I am an Assistant professor at the
Department of Music Technology and Acoustics, at Hellenic Mediterranean
University (HMU).
In February 2014 I joined the Institute of Computer Science of the
Foundation for Research and Development – Hellas (FORTH) as a postdoc
researcher.
In 2012 and 2013 I have served as a
research fellow at the Institute of Mathematics in
University of Potsdam, Germany. My project was concerned with the use of
nonlinear dynamical models for the analysis and synthesis of percussive
instruments.
From November 2010 till the end of
2011 I was a research fellow at the research centre of INRIA
in Rennes, France.
The academic year 2009 – 2010 I
worked at the Technical Educational Institute of Crete (TEI) where I was mainly
occupied as a lecturer at the Department of Music Technology and
Acoustics.
I finished my PhD at the School of Electrical and Computer
Engineering in the National Technical University of Athens (NTUA)
in 2008. During my PhD, I spent nine months as a Marie-Curie Fellow at the Center of Acoustic
Technology in Technical University of Denmark.
I received my diploma degree in Mechanical Engineering
from the School
of Mechanical Engineering
of NTUA in 2002.
My research interests are in the fields of
acoustics and audio signal processing. I am also active as a music composer and
song writer (you can listen to some of my songs at www.soundcloud.com/asteritik).
Click here for a link
to my full CV
Journal publications
Stefanakis
Í.,
Sarris J., Cambourakis G. and Jacobsen F.,
“Power output regularization in global sound equalization,” J. Acoust. Soc. Am.
123, pp 33-36 (2008).
http://orbit.dtu.dk/getResource?recordId=208788&objectId=1&versionId=1
Stefanakis
Í., Sarris J. and Cambourakis G., “Source
placement for equalization in small enclosures,” J. Audio Eng. Soc. 56
(5), 357-371 (2008).
http://www.aes.org/e-lib/browse.cfm?elib=12632
Stefanakis
Í.,
Sarris J. and Jacobsen F., “Regularization in
global sound equalization based on effort variation,” J. Acoust. Soc. Am. 126(2), 666-675 (2009).
http://orbit.dtu.dk/getResource?recordId=248311&objectId=1&versionId=1
Stefanakis
Í.,
Jacobsen F. and Sarris J., “Effort variation regularization in sound
field reproduction,” J. Acoust. Soc. Am, 128(2),
740-750 (2010).
http://link.aip.org/link/?JASMAN/128/740/1
Stefanakis
Í.,
Abel M. and Bergner A., “Sound
synthesis based on Ordinary Differential Equations,” J.
Computer
Music, 39(3), 46-58 (2015).
Stefanakis
Í.,
Pavlidi D. and Mouchtaris A., “Perpendicular
cross-spectra fusion for sound source localization with a planar microphone
array,” in IEEE Trans. on Audio, Speech and Language
Processing, 25(9), 1517-1531 (2017).
Stefanakis
Í.,
Mastorakis Y., Alexandridis A. and Mouchtaris A., “Automating
mixing of user-generated audio recordings from the same event,” accepted for publication in Journal of Audio Engineering
Society (2019).
Stefanakis
Í.,
“Efficient implementation of superdirective beamforming
in a half-space environment,” Journal of Acoustical
Society of America, 145(3), (2019).
Perez-Lopez
A. and Stefanakis N., “Analysis
of spherical isotropic noise fields with an A-format tetrahedral microphone,” Journal of Acoustical Society of America, 146(4), (2019).
conference PUBLICATIONS
Stefanakis
Í. and Sarris J., “Sound field reproduction using
the boundary element method,” in Proc. of 13th Int. Congress Sound Vib. (ICSV),
Vienna, 2006.
Sarris
J. C., Stefanakis N. J. and Cambourakis G. E.,
“Signal processing techniques for robust multichannel sound equalization,”
116th Convention of the Audio Engineering Society, Berlin, Germany, 2004,
preprint 6087. http://www.aes.org/e-lib/browse.cfm?elib=12632
Sarris
J., Stefanakis N. and Cambourakis G.,
“Sound equalization in
a large region of a rectangular room” Acoustics 2004, Hellenic Institute of Acoustics,
National Conference,
Thessaloniki, September 2004.
Stefanakis
Í., Dalianis S., Karatzas T. and Cambourakis G.,
“Power output regularization in the active reproduction of sound fields in
rooms,” in Proceedings of Acoustics’ 08, Paris, France.
http://intellagence.eu.com/acoustics2008/acoustics2008/cd1/data/articles/001704.pdf
Stefanakis N.
and Zervas P., “A method for broad-band sound field
reproduction in a large spatial region of a closed space,” Hellenic Institute
of Acoustics, National Conference, Athens, October 2010.
Stefanakis. N., Marchal J., Emiya V., Bertin N., Gribonval. R. and Cervenka P., “Sparse underwater acoustic imaging: A case study,” in Proceedings of ICASSP 2012, Kyoto, Japan.
http://hal.inria.fr/hal-00661526
Stefanakis. N., Marchal J., Emiya V., Bertin N., Gribonval. R. and Cervenka P., “Sparse reconstruction techniques for near-field
underwater acoustic imaging,” presented in Acoustics 2012, Nantes, France.
Stefanakis. N., Mastorakis Y. and Mouchtaris A., “Instantaneous detection and classification of
impact sound: Turning simple objects into powerful musical control interfaces,” joint ICMC-SMC
conference 2014, Athens,
Greece.
Stefanakis. N. and Mouchtaris A., “Foreground suppression in capturing and
reproduction of crowded acoustic environments,” in proceedings
of ICASSP 2015, Brisbane,
Australia.
Stefanakis. N. and Mouchtaris A., “A multi-sensor approach for real-time detection
and classification of impact sounds” to be presented in EUSIPCO 2015, Nice, France.
Stefanakis. N., Chonianakis S. and Mouchtaris A., “Automatic
matching and synchronization of user generated videos from a large scale sport
event”, in proceedings
of ICASSP, 2017.
Alexandridis A.,
Stefanakis N. and Mouchtaris A., “Towards
wireless acoustic sensor networks for location estimation and counting of
multiple speakers in real life conditions,” in proceedings of ICASSP, 2017.
Stefanakis. N., Viskadouros M. and Mouchtaris A., “A
subjective evaluation on mixtures of crowdsourced audio recordings”, in proceedings of EUSIPCO, 2017.
Stefanakis. N. and Mouchtaris A., “Maximum
Component Elimination in Mixing of User Generated Audio Recordings”, in proceedings of MMSP, 2017.
Stefanakis. N. and Mouchtaris A., “Normalization
of partly overlapping recordings from the same event based on relative signal
power”, in proceedings
of ICASSP, 2018.
Stefanakis. N., Delikiaris-Manias S. and Mouchtaris A., “Acoustic
beamforming in front of a reflective plane”, in proceedings of EUSIPCO, 2018.
Zervas P., Kouzoupis S. and Stefanakis. N., “Evaluating
a low-cost acoustic sensor for smart environments applications”, Hellenic
Institute of Acoustics, National Conference, Patra, October 2018.
Tzagkarakis C., Stefanakis N. and Tzagkarakis G.,
“Impact Sounds Classification for Interactive Applications via
Discriminative Dictionary Learning”, in proceedings of EUSIPCO, 2019.
BOOK CHAPTERS
Alexandridis
A., Pavlidi D., Stefanakis N. and Mouchtaris A., “Applications of TF-domain parametric
spatial audio techniques in teleconferencing and remote presence,” in
Parametric time-frequency-domain spatial audio,
Pulkki V., Delikaris-Manias S. and Politis A., Eds, Wiley (in press).
PATENTS
Abel M., Bergner A., Stefanakis N. and
Ahnert K., “Method and
system for synthetic modeling of a sound signal,” European Patent Office, EP
3012832 A1, 2016.
http://google.com/patents/EP3012832A1?cl=zh
Stefanakis N. and Mouchtaris A.,
“Direction of arrival estimation and sound source enhancement in the presence
of a reflective surface, apparatuses, methods, and systems”, USPTO
Non-Provisional Application No. 15/276,785, filed September 26, 2016
(accepted).
Stefanakis N. and Mouchtaris A., “Capturing and reproducing spatial sound
apparatuses, methods and systems”, USPTO Non-Provisional Application No.
15/183,554, filed June 15, 2016 (accepted).
Stefanakis N. and Mouchtaris A., “Foreground signal
suppression apparatuses, Methods, and Systems”, USPTO Non-Provisional
Application No. 15/183,573, filed June 15, 2016 (accepted).
Stefanakis N. and Mouchtaris A., “Direction of arrival
(DOA) estimation apparatuses, methods and systems”, USPTO Non-Provisional
Application No. 15/183,538, filed June 15, 2016 (accepted).
PHD Thesis
Stefanakis N, “Improvements in the
multiple-point method during equalization and sound field reproduction in
closed spaces”, PhD Thesis, School of
Electrical and Computer Engineering, National Technical University of Athens,
2008.