Sound Reproduction System Robust against Environmental Variation by Switching Control Band Range

概要

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A 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 is proposed. The reproduction accuracy of a conventional sound reproduction system is reduced by room environment variations when fixed inverse filter coefficients are used. This tendency becomes more significant when control points are arranged more closely. To resolve 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 improvement of the reproduction accuracy is about 6.1dB on average, even with a temperature fluctuation of 5°C as an environmental variation in the listening room.
（社）電子情報通信学会の論文
2008-06-01