An Iterative Inverse Filter Design For The Multi-Channel Sound Field Reproduction System

WESTPRAC VII 2000: the 7th West Pacific Regional Acoustics Conference, October 3-5, 2000, Kumamoto, Japan.In order to realize the multi-channel sound field reproduction system, it is indispensable to design inverse filters that remove the effect of room transfer functions. The design method in the frequency domain based on the least-norm-solution (LNS) is less memory and less calculation than the design method in the time domain. However, the LNS method cannot guarantee the causality and stability of the filters. In this paper, a design method of a time domain inverse filter using iterative processing in the frequency domain for multi-channel sound field reproduction is proposed, and the numerical analysis result is described. The proposed method can decrease the squared error for every sensor by 3-12 dB. Furthermore, the reproduced sound by this method attains over 13 dB improvement in the segmental SNR compared with one designed by the LNS method for real environment impulse responses