WiSound™ is an innovative organization working as a hub between many international and multifunctional research teams and companies, innovative electronics manufacturers, and university partners.

We are especially proud of our cooperation with the leading Audio Laboratory of Patras University and professor Mourjopoulos.

You are welcome to visit the site Audio Lab to meet the researchers and get familiar with their projects lighting the future of audio technology.

Audio and Acoustic Technology Group (Audio Group)
of the Wire Communications Laboratory (WCL),
Department of Electrical & Computer Engineering,
University of Patras.

"HD Digital Multimedia Center with Intelligent Room Equalization System" was released in collaboration with the "Audio and Acoustic Technology" group from the University of Patras, BLUEdev, and Ergologic on December 2014.

The project created a central entertainment unit to provide:

1. Innovative Custom-tailored Automatic Room Equalization in two steps:

•The innovative EQ system sends all Speaker and Room measurements to Engineering Support via the network.

•The Engineering Support sends back custom-tailored DSP with EQ parameters for perfect sound in any room.

2. Intelligent Remote control with Microphone and touchscreen
3. Advanced Networking features and services
4. Full Media Player capabilities

The project was funded by the European Union.

The following are only a few examples of the many publications of the Audio Laboratory of Patras University engineers and professor Mourjopoulos, related with our commonly developed projects.
For even more publications, the engineers who want to learn more are invited to visit http://www.wcl.ece.upatras.gr/audiogroup/publications/2012.html

• “Modeling the aesthetics of audio scene reproduction”, “The Technology of Binaural Understanding”, Mourjopoulos J.,  J. Blauert and J. Braasch editors, Springer 2021
• Low Filter Order Digital Equalization for Mobile Device Earphones, Kamaris G., Zachos P., Mourjopoulos J.  J. Audio Eng. Soc. (2020)
• "Stereo Image Localization Maps for Loudspeaker Reproduction in Rooms." G. Kamaris, J. Mourjopoulos,  presented at the 144th Audio Engineering Society International Pro Audio Convention, AES 2018, Milan, Italy, May 2018.
• “Dual-Band PWM for filterless class-D audio amplification”, K. Kaleris and J. Mourjopoulos,  presented at the 144th Audio Engineering Society International Pro Audio Convention, AES 2018, Milan, Italy, May 2018.
• “Statistical analysis of coloration in audio signals”, G. Christopoulos, K. Kaleris, G. Kamaris, P. Hatziantoniou, J. Mourjopoulos presented at the Helenic Institute of Acoustics “ACOUSTICS2018” conference (in Greek), Patras, Greece, October 2018.
• “A method for up-mixing two channel stereo audio signals for surround sound reproduction”, D. Koutsaidis, G. Kamaris, J.Mourjopoulos,  presented at the Helenic Institute of Acoustics “ACOUSTICS2018” conference (in Greek), Patras, Greece, October 2018.
• “Study and application of the pole-fitting method in headphones equalization” G. Kamaris, P. Hatziantoniou, M. Atsalis , J. Mourjopoulos,  presented at the Helenic Institute of Acoustics “ACOUSTICS2018” conference (in Greek), Patras, Greece, October 2018.
• “Audio system spatial image evaluation via binaural feature classification”, G. Kamaris, S. Karlos, S. Terpinas, D. Koutsaidis, J.Mourjopoulos,  142nd Audio Eng. Soc. International Convention (AES 2017), Berlin, 2017.
• "Complex-smoothed phase study for digital acoustic responses correction", N. Memeletzoglou, E. Pasxou, P. Hatziantoniou, F. Kontomichos and J.Mourjopoulos,  In Proc. of the Hellenic Institute of Acoustics "Acoustics 2016" conference (in Greek), Athens 2016.
• "PC-based room correction for audio", F. Kontomichos, N.A. Tatlas, P. Hatziantoniou, C. Papadakos,  in AM ’15 Proceedings of the Audio Mostly 2015 on Interaction With Sound, Thessaloniki, Greece, 2015.
• “Low Frequency Room Response Study Excited via Multiple Subwoofers» (in Greek), G. Kamaris, Th. Altanis and J. Mourjopoulos,  presented in the Acoustics 2014, Thessaloniki, 2014.

• “Sound Source Distance Estimation in Rooms based on Statistical Properties of Binaural Signals”, E. Georganti, T. May, S. van den Par, J. Mourjopoulos , IEEE Trans. on Audio, Speech and Lang. Proc., Vol. 21, p. 1727-1741, July/August 2013.
• “Extracting Room and Source-distance Information from Binaural Signals”, E. Georganti, T. May, S. van der Par, J. Mourjopoulos, chapter in the book “The Technology of Binaural Hearing”, J. Blauert editor, Springer 2013.
• “Binaural Dereverberation”, A.Tsilfidis, A. Westermann, J. Buchholz, E. Georganti, J. Mourjopoulos , chapter in the book “The Technology of Binaural Hearing”, J. Blauert editor, Springer 2013.
• "A Wiener Filter Approach to Microphone Leakage Reduction in Close-Microphone Applications", E. K. Kokkinis, J. D. Reiss and J. Mourjopoulos, IEEE Trans. on Audio, Speech and Lang. Proc., Vol. 20, p. 767-779, March 2012.
• "Automatic speech recognition performance in different room acoustic environments with and without dereverberation preprocessing", p. 380-395, 2013. A. Tsilfidis, I. Mporas, J. Mourjopoulos and N. Fakotakis, Computer Speech and Language, Vol. 27
• “Statistical properties of the close-microphone responses”, E. K. Kokkinis, E. Georganti and J. Mourjopoulos, 132nd Convention of the Audio Engineering Society, Budapest, Hungary, 2012.
•  "On the statistics of binaural room transfer functions", E. Georganti, T. May, S. van de Par, J. Mourjopoulos, 132nd Convention of the Audio Engineering Society, Budapest, Hungary, 2012.  
•  "Smart Microphone Sensor System Platform." E. Kokkinis, K. Drossos, N.-A. Tatlas, A. Floros, A. Tsilfidis and K. Agavanakis. In Proc. of the 132th Convention of the Audio Engineering Society, Budapest, Hungary, 2012.
• "Speaker Distance Detection using a Single Microphone", E. Georganti, T. May, S. van de Par, A. Harma and J.Mourjopoulos, IEEE Transactions on Audio, Speech, and Language Processing, Vol.19 (7), p. 1949-1961, September 2011. 
• "Blind single-channel suppression of late reverberation based on perceptual reverberation modeling" , A. Tsilfidis and J. Mourjopoulos, ,Journal of the Acoustical Society of America, 129(3), p. 1439-1451, 2011.   
•  "Binaural extension and performance of single-channel spectral subtraction dereverberation algorithms", A. Tsilfidis, E. Georganti and J. Mourjopoulos, IEEE ICASSP, Prague, Czech Republic, 2011.
• "Suppression of late reverberation at multiple speaker positions utilizing a single impulse response measurement", A. Tsilfidis, E. K. Kokkinis and J. Mourjopoulos, Forum Acusticum, Aalborg, Denmark, 2011.
• "A binaural framework for spectral subtraction dereverberation" , A. Tsilfidis, E. Georganti and J. Mourjopoulos, Forum Acusticum (invited paper), Aalborg, Denmark, 2011.
•  "Testing and simulation of a thermoacoustic loudspeaker prototype" , F. Kontomichos, A. Koutsioubas, J. Mourjopoulos, N. Spiliopoulos, A. Vradis, S. Vassilantonopoulos, presented at the Audio Engineering Society 126th Convention, Munich, Germany, May 2009.
•  "Blind single-channel dereverberation for music post-processing" , A. Tsilfidis and J. Mourjopoulos , 130th Convention of the Audio Engineering Society, London, UK, 2011.
• "Joint noise and reverberation suppression for speech applications" , 130th Convention of the Audio Engineering Society, London, UK, 2011. 8] E. K. Kokkinis, A. Tsilfidis, E. Georganti and J. Mourjopoulos
• "Detection of 'solo intervals' in multiple microphone multiple source audio applications" , 130th Convention of the Audio Engineering Society, London, UK, 2011. [9] E. K. Kokkinis, J. Reiss and J. Mourjopoulos
•  "Statistical Analysis of Binaural Room Impulse Responses" , 130th Convention of the Audio Engineering Society, London, UK, 2011. [10] E. Georganti, A. Tsilfidis and J. Mourjopoulos
• “Signal-dependent constraints for perceptually motivated suppression of late reverberation”, Signal Processing, Volume 90, pp. 959-965, 2010. (Elsevier Link: http://dx.doi.org/10.1016/j.sigpro.2009.09.020) A.Tsilfidis and J. Mourjopoulos
•  "Unmixing Acoustic Sources in Real Reverberant Environments for Close-Microphone Applications", E. Kokkinis and J. Mourjopoulos, J. Aud. Eng. Soc., Vol. 58(11), pp. 907-922, Nov. 2010.
• “Design and performance of a Sigma-Delta Digital Loudspeaker Array prototype” , N. A. Tatlas, F. Kontomichos and J. Mourjopoulos, Journal of the Audio Engineering Society, Volume 57, Issue 1/2, pp. 38-45, January 2009.
•  "Analysis of room transfer function and reverberant signal statistics" , E. Georganti, J. Mourjopoulos and F. Jacobsen, presented at the Acoustics ’08 Convention (in English), Paris, June-July 2008.
•  "A Wireless PDA-based Acoustics Measurement Platform", P. Alexandridis, N.-A. Tatlas, P. Hatziantoniou and J. Mourjopoulos, presented at the Audio Engineering Society 122th Convention, Vienna, May 2007.
•  "Perceptual Distortion Maps for Room Reverberation", T. Zarouchas and J. Mourjopoulos, presented at the Audio Engineering Society 122th Convention, Vienna, May 2007.
• "Wireless Digital Audio Delivery Analysis and Evaluation",  N.A. Tatlas, A. Floros and J. Mourjopoulos, presented at the IEEE 31st International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Toulouse, May 2006.
•  "A Paradigm for Wireless Digital Audio Home Entertainment", [2] N. Kokkos, A. Floros, N.A. Tatlas and J. Mourjopoulos, presented at the Audio Engineering Society 120th Convention, Paris, May 2006.
• "Subjective Assessments of Real-Time Room Dereverberation and Loudspeaker Equalization", J. Worley, P. Hatziantoniou, J. Mourjopoulos, presented at the Audio Engineering Society 118th Convention, Barcelona, May 2005.
•  "An Evaluation Tool for Wireless Digital Audio Applications", [3] N.-A. Tatlas, A. Floros, J. Mourjopoulos , presented at the Audio Engineering Society 118th Convention, Barcelona, May 2005.
•  "BlueBox: A cable-free Digital Jukebox for compressed-quality Audio Delivery", [4] A. Floros, N.-A. Tatlas, J. Mourjopoulos , published in the IEEE Transactions on Consumer Electronics, Volume 51, No.2, May 2005
•  "About room response equalization and dereverberation", [7] M. Karjalainen, T. Paatero, J. Mourjopoulos, P. D. Hatziantoniou, presented at the 2005 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (IEEE WASPAA '05), NewPaltz New York, October 2005.
• "Real-Time Room Equalization Based on Complex Smoothing: Robustness Results", [1] P. Hatziantoniou, J. Mourjopoulos , presented at the Audio Engineering Society 116th Convention, Berlin, May 2004.
• "Digital Loudspeaker Arrays driven by 1-bit signals", [2] N.-A. Tatlas and J. Mourjopoulos, presented at the Audio Engineering Society 116th Convention, Berlin, May 2004.
•  "Errors in Real-Time Room Acoustics Dereverberation", [6] P. Hatziantoniou and J. Mourjopoulos, Journal of the Audio Engineering Society, Vol. 52, No. 9, pp. 883-899, September 2004.
• "Results for Room Acoustics Equalization Based on Smoothed Responses", [2] P. Hatziantoniou, J. Mourjopoulos, presented at the Audio Engineering Society 114th Convention, Amsterdam, March 2003
• "Towards the All-Digital Audio/Acoustic Chain: Challenges And Solutions", [3] N.-A. Tatlas, A. Floros, P. Hatziantoniou, and J. Mourjopoulos, presented at the Audio Engineering Society 23th Conference, Copenhagen, May 2003
• "A Study of Wireless Compressed Digital-Audio Transmission", A. Floros, M. Koutroubas, N.-A. Tatlas and J. Mourjopoulos, presented at the Audio Engineering Society 112th Convention, Munich, May 2002
•  "A Distortion-free PWM Coder for All-digital Audio Amplifiers", [1] A. Floros, N. A. Tatlas and J. Mourjopoulos, presented at the Audio Engineering Society 110th Convention, Amsterdam, May 2001.
•  "Room Masking:Understanding and Modelling the Masking of Room Reflections", [2] J. Buchholz, N. Mourjopoulos, J. Blauert, presented at the Audio Engineering Society 110th Convention, Amsterdam, May 2001.
•  "Generalized Fractional-Octave Smoothing of Audio and Acoustic Responses", [2] P. Hatziantoniou, J. Mourjopoulos, Journal of the Audio Engineering Society, Vol. 48, No. 4, pp. 259 - 280, April 2000.
•  "Perceptual Filters for Audio Signal Enhancement ", [1] Tsoukalas D., Mourjopoulos J., Kokkinakis G., Journal of the Audio Engineering Society, Vol. 45, No. 1/2, pp. 22-36, Jan./Feb. 1997.
•  "Digital System for Loudspeaker and Room Equalisation", [3] Salamouris S., Politopoulos K., Tsakiris V., Mourjopoulos J., Audio Engineering Society 98th Convention, Paris, 1995.
•  "Digital Equalization of Room Acoustics", [1] Mourjopoulos J., Journal of the Audio Engineering Society, Nov. 1994.
•  "A Dedicated Processor for Time-varying Digital Audio Filters", [4] Nikolaidis S., Mourjopoulos J., Goutis E., IEEE Trans. on Circuits and Systems, 40(7), July 1993.
• "Pole and Zero Modeling of the Room Transfer Function", [1] Mourjopoulos J., Paraskevas M., Journal of Sound and Vibration, Vol. 146(2), pp. 281-302, 1991.
•  "Theory and Real-time Implementation of Time Varying Digital Audio Filters", [1] Mourjopoulos J., Kyriakis-Bitzaros E., Goutis E., Journal of the Audio Engineering Society, Vol. 38, pp. 523-536, 1990.