Sound reproduction system with adaptive compensation of temperature fluctuation effect

We describe a method of compensating temperature fluctuation by a linear-time-warping processing in a sound reproduction system. This technique is applied to impulse responses of room transfer functions, to achieve a high-quality sound reproduction system, particularly one that treats high-frequency components. Moreover, we propose an adaptive algorithm for the estimation of a suitable warping ratio, using the observed signal of reproduced sound obtained at only one microphone which is set apart from listener not to prevent from listening. Using the proposed algorithm, we can improve the reproduction accuracy at each control point for listening by about 17 dB, under the condition that the fluctuation is temperature fall of 1.1/spl deg/C.