Development of prototype sound direction control system using a two-dimensional loudspeaker array

This paper proposes an improved method for a sound direction control system based on the boundary surface control principle. In our previous work, numerical simulations showed that a loudspeaker array with a square-matrix configuration and an elliptical configuration of the suppression control points achieved better characteristics than did a conventional straight-line loudspeaker array. Based on this, we try to construct a real prototype, where a crucial problem is that the elliptical configuration of control sensors is impractical for packaging. Therefore, we develop a method to form a practical control sensor arrangement that has a function equivalent to the elliptical boundary of the control points. The feasibility of the method is first confirmed by numerical simulation and then characteristics of the prototype are examined in a real acoustic environment.