Fifth International Congress on Sound and Vibration

very often additional noise of arbitrary distribution type can be observed. Therefore, for the purpose of predicting the output response probability of acoustic system with an arbitrary stochastic input in the presence of the additional noise, it is necessary to find some new stochastic signal processing method reflecting the effect of the above additional noise fluctuation. In this paper, first, a relationship between the system output excited by a specific stochastic input of reference type and an arbitrary random input without the additional noise for an arbitrary acoustic systems is introduced in the form on an intensity scale. Next, a relationship between the system output excited by an arbitrary stochastic input in the absence and that in the presence of the additional noise is also introduced in the form on an intensity scale. Then, based on these relationships, a new prediction method of the system output for the arbitrary acoustic systems with the additional noise is proposed especially by use of the observed data excited by the specific stochastic input of reference type with the additional noise. Finally, the effectiveness of the proposed method is confirmed experimentally too by applying it to the actual type sound wall systems.