Acoustic source localisation inside cabins

摘要

Sound Source Localization (SSL) techniques are now rather well operational in free field. On the opposite, those techniques cannot be used in compartments due to reflective waves which cause important localization limitations. The actual paper presents two methods to deal with SSL inside cabins: - In order to cartography a limited zone, the use of a half cylindrical acoustic antenna positioned in near field will give the best results we can expect in terms of spatial resolution and dynamics. The processing is the Nearfield Focusing also use for SSL in free field. - In order to cartography the entire compartment, MicrodB has developed an original technique based on the combination of an spherical solid shaped antenna and a processing that takes into account the acoustic diffraction around the antenna (spherical harmonic decomposition). This system is patented by MicrodB in co-ownership with Airbus. The advantages of this solid acoustic sphere against transparent or opened sphere are presented here.