Directional loudspeaker arrays for acoustic warning systems with minimised noise pollution

Robart, 2009, Are hybrid cars too quiet?, J Acoust Soc Am, 125, 2744, 10.1121/1.4784573 Hanna R. Incidence of pedestrian and bicyclist crashes by hybrid electric passenger vehicles. Technical report September, NHTSA; 2009. Cheer, 2013, Design and implementation of a directive electric car warning sound, vol. 35, Pt. 1, 1 Van Veen, 1988, Beamforming: a versatile approach to spatial filtering, 4 Brandstein, 2001 Van Trees, 2002 Pinto, 2010, Near-field adaptive beamforming and source localization in the spacetime frequency domain, 2734 Guldenschuh M. Transaural stereo in a beamforming approach. In: Proceedings of the 12th int conference on digital audio effects (DAFx-09); 2009. p. 10–5. Boone, 2010, Design of a highly directional endfire loudspeaker array, J Audio Eng Soc, 309 Choi, 2002, Generation of an acoustically bright zone with an illuminated region using multiple sources, J Acoust Soc Am, 111, 1695, 10.1121/1.1456926 Chang, 2009, A realization of sound focused personal audio system using acoustic contrast control, J Acoust Soc Am, 125, 2091, 10.1121/1.3082114 Shin, 2010, Maximization of acoustic energy difference between two spaces, J Acoust Soc Am, 128, 121, 10.1121/1.3438479 Parra LC. Least squares frequency-invariant beamforming. In: Proc IEEE workshop on applications of signal processing to audio and acoustics; 2005. p. 102–5. Yon, 2003, Sound focusing in rooms: the time-reversal approach, J Acoust Soc Am, 113, 1533, 10.1121/1.1543587 Guldenschuh M. Principles and considerations to controllable focused sound source reproduction. In: Proc 7th Eurocontrol INO; 2008. p. 1–8. Gan, 2012, Parametric acoustic array: theory, advancement and applications, Appl Acoust, 73, 1209, 10.1016/j.apacoust.2012.06.016 Gough, 1997, Unified framework for modern synthetic aperture imaging algorithms, Int J Imag Syst Technol, 8, 343, 10.1002/(SICI)1098-1098(1997)8:4<343::AID-IMA2>3.0.CO;2-A Francis, 1961, The QR transformation – Part 1, Comput J, 4, 265, 10.1093/comjnl/4.3.265 Francis, 1962, The QR transformation – Part 2, Comput J, 4, 332, 10.1093/comjnl/4.4.332 Arbenz, 2012 Demmel, 1997 Elliott, 2012, Robustness and regularization of personal audio systems, IEEE Trans Audio Speech Lang Process, 20, 2123, 10.1109/TASL.2012.2197613 Van Genechten B, Berkhoff AP. Simulation-based design of a steerable acoustic warning device to increase (H)EV detectability while reducing urban noise pollution. In: Proc TRA 2014, Paris, paper no. 18452, TRA; 2014. p. 1–12. Quinn D, Mitchell J, Clark P, Garcia JJ. eVADER – development and initial evaluation of a next generation pedestrian alert solution for quiet electric vehicles. In: Proc FISITA 2014, Maastricht, paper no. F2014-NVH-080, FISITA; 2014. p. 1–11.