Erfassung und Evaluierung der Übersprecheigenschaften des Ikosaederlautsprechers

Paper (2.918 KB pdf)

Since the beginning of 2006 the IEM works on a new spherical audio reproduction system which is formed as a regular polyhedron with 20 equilateral triangles as faces. Every face of this hollow icosahedron is equipped with an individually driven loudspeaker. Employing suitable processing of the driving signals, the loudspeaker array can accomplish various acoustic radiation patterns. This recent development provides new perspectives on the reproduction of sounds, taken from acoustics measurements on musical instruments, room acoustic measurements, etc... (spherical acoustic holography / wave field synthesis). The aim of this project is the capture of crosstalk between the loudspeakers of the icosahedral array over the common enclosure. While exciting one single loudspeaker with an appropriate signal, the movements of all loudspeakers shall be determined using a laser-vibrometer. There is good reason to assume, that passive excitation via the common interior occurs, such that inactive speaker membranes get passively excited. Eventually, the measurements in this work provide insight into this interaction, and are discussed in the conclusion of this work.