Robust source array configuration for minimizing the effect of reflection in an interior space

A robust source array configuration in an enclosed space is investigated to render a planar propagating wave field in an interior space. To render a desired sound field in an interior space, the reverberant field induced by the walls should be considered unlike rendering in an exterior space. Because the reflected wave field depends on the wall properties, precise modelling of the boundary condition is preferable to precisely render the sound field. However, perfect identification of the boundary condition for every reflector in the space is not easy in a real situation, and approximated values are generally adopted. In this work, the application of source array configuration, which can maintain the performance despite the input noise and deviation of boundary conditions, which are present in a real situation, is investigated as an alternative method instead of perfect modelling. Two configuration methods are applied: choosing the source position with higher linear independency and enclosing the control region with an array. The simulation results show that these methods can achieve a relatively robust condition to the noise of the input signal and modelling error of the boundary condition.