Sound reproduction system with simultaneous perturbation method

In this paper, we propose a novel sound field reproduction system using the simultaneous perturbation (SP) method and its fast convergence version. In the conventional sound reproduction systems, the preprocessing filters are generally determined and fixed based on transfer functions from loudspeakers to control points in advance. However, movements of control points result in severe localization errors. Therefore, we propose a sound field reproduction system using the SP method which updates the filter coefficients only using error signal. The SP method suffers from the disadvantage of slow convergence, although this method can track the movements of any controlling points. Hence, we also propose an improving method of the convergence speed, which compensates only the delay by using the delay control filters. Simulation results demonstrate that the proposed methods can track the movements of control points and have reasonable convergence speed.