Adaptive directivity control of speaker array

We report a study of real time system for directivity control of speaker array. This system has some features. First, the array is made of omnidirectional sound source arranged in same plane to control the two-dimensional sound field. Next, the arrayed units are driven by adaptive FIR filters so that we can change the directivity of the composite source, and it is controlled in real time. In this paper, we report the results of experiments on off-line directivity control of speaker array which is composed of three speakers. We examined layout of the units and control set-up for efficient directivity control. The measurement results of directivity are fairly good if it considered that there were not many sound sources.