An inverse filter design method considering control points arrangement and control band for sound reproduction system

In this paper, we propose a new inverse filter design method for robust multichannel sound reproduction system that utilizes the relationship between the width of the actual control area and the control frequency of the control points. The reproduction accuracy of a conventional sound reproduction system is reduced by room environmental variations when inverse filter coefficients are fixed. To break this problem, the frequency control band at every control point is switched to avoid degrading the reproduced sound in low frequencies, so the pass band range of the control points at both ears is only high-range. That of the other control points is the entire control range. Numerical simulation with real environmental data showed that the reproduction accuracy is improved, even with a temperature fluctuation as an environmental variation in the listening room.