Research project on the

Applications of the Auralization technique to car audio systems

in conjunction with the Dept. of Industrial Engineering - University of Parma - Italy

This page is actually under construction !!!

Actual research is devoted to 5 main themes:

  1. Digital equalization of car audio systems for correcting the frequency response, the time misalignment and the spatial impression inside cars.
  2. Subjective comparison of car sound systems by means of the auralization technique.
  3. Surround systems based on Transaural and Ambisonics methods for car sound systems.
  4. Advanced measurement systems for car-audio.
  5. Linearization of the loudspeaker's response through not-linear inverse numerical filters.
  6. Digital equalization with Warped FIR filters.

The results already obtained allowed for the publication of these papers:

  1. A. Farina, F. Righini – "Software implementation of an MLS analyzer, with tools for convolution, auralization and inverse filtering" – Pre-prints of the 103rd AES Convention, New York, 26-29 September 1997.
  2. A. Farina, E. Ugolotti, "Subjective comparison of different car audio systems by the auralization technique", Pre-prints of the 103rd AES Convention, New York, 26-29 September 1997.
  3. A. Farina, E. Ugolotti, "Use of digital inverse filtering techniques for improving car audio systems", Pre-prints of the 103rd AES Convention, New York, 26-29 September 1997.
  4. A. Farina, E. Ugolotti – "Subjective evaluation of the sound quality in cars  by the auralisation technique" – Proc. of  4th International Conference and Exhibition Comfort in the automotive industry - Bologna (Italy) October 2-3, 1997.
  5. A. Farina, E. Ugolotti, "Spatial equalisation of sound systems in cars by digital inverse filtering", Proc. of  4th International Conference and Exhibition Comfort in the automotive industry - Bologna (Italy) October 2-3, 1997.
  6. A. Farina, E. Ugolotti – "Subjective evaluation of the sound quality in cars  by the auralisation technique" – Proc. of IOA Conference "Reproduced Sound 13", Hydro Hotel, Bowness on Windermere, GB, October 24-26 1997.
  7. A. Farina, E. Ugolotti, "Spatial equalisation of sound systems in cars by digital inverse filtering" – Proc. of IOA Conference "Reproduced Sound 13", Hydro Hotel, Bowness on Windermere, GB, October 24-26 1997.
  8. Angelo Farina, E. Ugolotti - "Automatic Measurement System for Car Audio Applications" - Pre-prints of the 104th AES Convention, Amsterdam, 1998 May 16-19.
  9. Angelo Farina - "Software Implementation of B-Format Encoding and Decoding" - Pre-prints of the 104th AES Convention, Amsterdam, 1998 May 16-19.
  10. A. Bellini, E. Ugolotti, C. Morandi, "Analog fuzzy audio processor for loudspeaker systems", Proc. of FUZZ IEEE'98, Anchorage, AK, May 1998, pp. 1--6
  11. Bellini, G. Cibelli, E. Ugolotti, A. Farina, C. Morandi - "Non-linear digital audio processor for dedicated loudspeaker systems" - Proc. of International IEEE Conference on Consumer Electronics, Los Angeles, June 1998.
  12. A. Bellini, G. Cibelli, E. Ugolotti, A. Farina, C. Morandi - "Non-linear digital audio processor for dedicated loudspeaker systems" - IEEE Transactions on Consumer Electronics, vol. 44, n. 3, August 1998.
  13. A. Bellini, A. Boni, C. Morandi, "Mixed High level and circuital simulation of Current-Driven Loudspeaker systems", in Proc. MWSCAS'98, Notre Dame IN, August 1998, pp. 104--107
  14. A. Farina, E. Ugolotti - "Spatial Equalization of sound systems in cars" - Proc. of 15th AES Conference "Audio, Acoustics & Small Spaces", Copenhagen, Denmark, 31/10-2/11 1998.
  15. A. Farina, E. Ugolotti, Bellini, G. Cibelli,C. Morandi -"Inverse numerical filters for linearisation of loudspeaker's response" - DAFX-98 Conference, November 19-21, 1998 Barcelona, Spain
  16. A. Farina, E. Ugolotti - "Numerical model of the sound field inside cars for the creation of virtual audible reconstructions"- DAFX-98 Conference, November 19-21, 1998 Barcelona, Spain
  17. A. Farina, E. Ugolotti - "Subjective comparison between Stereo Dipole and 3D Ambisonics surround systems for automotive applications" - 16th AES Conference, Rovaniemi (Finland), 10-12 April 1999 (Also available in zipped PDF format).
  18. G. Cibelli, A. Bellini, E. Ugolotti, A. Farina, C. Morandi - "Experimental validation of loudspeaker equalization inside car cockpits" - 106th AES Convention, Munich, 8-11 may 1999.
  19. O.Kirkeby,  P.A. Nelson, P. Rubak, A. Farina - "Design of Cross-talk Cancellation Networks by using Fast Deconvolution" - 106th AES Convention, Munich, 8-11 may 1999.
  20. G. Cibelli, A. Bellini, E. Ugolotti, ``Dynamic measurements of low-frequency loudspeakers modeled by Volterra series'', preprint #4968 of AES 106th convention, Munich, 8-11 May 1999.
  21. Ole Kirkeby, Per Rubak, Angelo Farina - "Analysis of ill-conditioning of multi-channel deconvolution problems" - 1999 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics -Mohonk Mountain House New Paltz, New York October 17-20, 1999
  22. A. Farina - "Simultaneous measurement of impulse response and distortion with a swept-sine technique" - 108th AES Convention, Paris 18-22 February 2000.
  23. A. Bellini, E.Armelloni,  E. Ugolotti, G. Cibelli, A. Farina - "Experimental validation of warping filters inside car cockpits" - Proc. of International IEEE Conference on Consumer Electronics, Los Angeles, June 2000.
  24. A. Farina, A. Bellini, E. Armelloni - "Implementation of cross-talk canceling filters with warped structures - Subjective evaluation of the loudspeaker reproduction of stereo recordings" - Proc. of SHARC2000, Boston, 11-13 September 2000.
  25. A. Bellini, E. Ugolotti, G. Cibelli, A. Farina, C. Morandi, G. Gobbi - "APLODSP, design of customizable Audio Processor for LOudspeaker system compensation by DSP" - 109th AES Audio Convention, Los Angeles, 18-22 September 2000.
  26. A. Bellini, E. Armelloni, G. Cibelli, E. Ugolotti, A. Farina - "Experimental validation of equalizing filter for car cockpits designed with Warping technique" - 109th AES Audio Convention, Los Angeles, 18-22 September 2000.
  27. A. Bellini, G. Cibelli, E. Armelloni,  E. Ugolotti, A. Farina - "Car cockpit equalization by warping filters" - IEEE Transactions on Consumer Electronics, vol. 47, no. 1, pp. 108-116, ISSN 0098-3063, February 2001.
  28. 152 E. Ugolotti, G. Gobbi, A. Farina "IPA - A Subjective Assessment Method of Sound Quality of Car Sound Systems" -  Proceedings of the 110th AES Convention, 2001 May 12-15 Amsterdam, The Netherlands.
  29. A. Farina, G. Cibelli, A. Bellini - "AQT - A New Objective Measurement Of The Acoustical Quality Of Sound Reproduction In Small Compartments" - Proceedings of the 110th AES Convention, 2001 May 12-15 Amsterdam, The Netherlands.
  30. A. Farina, A. Bellini, E. Armelloni - "Non-Linear Convolution: A New Approach For The Auralization Of Distorting Systems" - Proceedings of the 110th AES Convention, 2001 May 12-15 Amsterdam, The Netherlands.
  31. A. Farina - Metodologie di Misura e Valutazione - Seminario Top Audio 2001 "L'acustica dei piccoli ambienti d'ascolto" - AES Italian Section, Milano, 15 settembre 2001.
  32. E. Ugolotti, E. Armelloni, F. Bozzoli, A. Farina - Effects of the background noise of the perceived quality of car audio systems - 112th AES Convention, Munich, 10-13 May 2002
  33. A. Farina, A. Bellini, M. Romagnoli - Different approaches for the equalization of automotive sound systems - 112th AES Convention, Munich, 10-13 May 2002
  34. A. Azzali, A. Bellini, A. Farina, E. Ugolotti - Design and Implementation of Psychoacoustics Equalizer for Infotainment  - DSP Application Day, Politecnico di Milano, 23 September 2002
  35. A. Farina, F. Bozzoli - Measurement of the speech intelligibility inside cars - 113th AES Convention, Los Angeles, 5-8 October 2002
  36. A. Azzali, A. Bellini, E. Carpanoni, M. Romagnoli, A. Farina - AQTtool an automatic tool for design and synthesis of psychoacoustic Equalizers  - 114th AES Convention, Amsterdam, 22-25 March 2003

Furthermore, a complete description of the first 4 years of this research is available in Italian, in the form of Research Advancement Reports:

This page is maintained by Angelo Farina.