A broad-band signal control in sound reproduction system by temperature compensation of room impulse responses

We describe a method of compensating temperature fluctuation by 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. First, the impulse responses of room transfer functions are measured before and after temperature fluctuation, and the former are converted into the latter by the proposed process. Next, we design inverse filters for the system, and evaluate the improvement of the reproduction accuracy and spectrum distortion. By using adequate warping ratio, we can improve the reproduction accuracy at any frequency.