A study of wide-band signal control by temperature compensation for sound reproduction system

摘要

To achieve a multichannel sound reproduction system, it is indispensable to design multichannel inverse filters which cancel the effects of room transfer functions. Generally speaking, in a design of inverse filters for such sound reproduction system, we often consider the room transfer functions as a time-invariant system. However, the time invariance of the room transfer functions cannot be guaranteed in a real acoustic environment. Thus, a fluctuation of the room transfer functions degrades the reproduction accuracy, especially in high frequency components. This paper describes a compensation method for temperature fluctuation by linear-time-warping processing to avoid the degradation of a reproduction accuracy of the sound reproduction system. By using an adequate warping ratio, we can improve the reproduction accuracy of 10 dB in average.