METHOD FOR EFFICIENT SOUND FIELD CONTROL OF A COMPACT LOUDSPEAKER ARRAY

摘要

The invention relates to a method for optimizing the design and sound field control of a compact loudspeaker array (19) comprising a plurality of loudspeakers (2) located on a closed loudspeaker surface (4),and the control of the emitted sound field (1) by said loudspeakers (2) within a limited reproduction subspace (3). The method further comprises steps of capturing said sound field (1) using a plurality of first microphones (5) and adjusting first filter coefficients (8) that modify the alimentation signals (9) of said loudspeakers (2) so as to minimize the difference between reproduced signals (6) captured by said first microphones (5) and target signals (10) describing a target sound field (11).Therefore,a conical reproduction surface (22) enclosing the reproduction subspace (3) is defined such that the apex of said conical reproduction surface (22) is comprised within the closed loudspeaker surface (4). Then, a closed microphone surface (7) comprising the apex of the conical reproduction subspace (22) and the closed loudspeaker surface (4) is defined. Loudspeakers (2) are thus substantially positioned on a limited loudspeaker surface (23) defined by the intersection of the inner volume of the conical reproduction subspace (3) and the closed loudspeaker surface (4). Finally, first microphones (5) are substantially located on a limited microphone surface (24) defined by the intersection of the inner volume of the conical reproduction subspace (3) and the closed microphone surface (22).