Inverse scheme for sound localization
* Präsentierender Autor
Zusammenfassung:Methods that are using microphone arrays for acoustic source localization have become well known as "acoustic beamforming" and are used e.g. for noise reduction tasks. Although improvements to the standard beamforming method (like CLEAN-SC, DAMAS, Orthogonal Beamforming etc.) have been developed, drawbacks in beamforming are that no phase information of the acoustic sources can be recovered, applicability in the low frequency range is limited and that the assumed free field radiation is not realistic in most practical cases. The method presented in this talk uses a different approach for acoustic source localization. The underlying acoustic PDE is solved by use of the Finite Element Method considering the actual boundary conditions present in the measurement setup. Then the inverse problem of matching the measured acoustic pressure to the simulated pressure at the microphone positions is solved in order to identify the source locations with corresponding amplitudes and phases. Thereby, we either assume monopole sources in the volume or we identify the particle velocity on the surface.