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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(6):1362-1366; doi:10.1093/ietfec/e91-a.6.1362
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Acoustic Scene Analysis and Reproduction - Letters

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

Yosuke TATEKURA1 and Takeshi WATANABE1

1 The authors are with the Faculty of Engineering, Shizuoka University, Hamamatsu-shi, 432-8561 Japan. E-mail: tytatek{at}ipc.shizuoka.ac.jp


  Abstract

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 6.1 dB on average, even with a temperature fluctuation of 5°C as an environmental variation in the listening room.

Key Words: sound reproduction, room transfer function, inverse filter, control area, robustness

Manuscript received August 4, 2007. Manuscript revised November 22, 2007.


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