1997 Volume 10 Issue 12 Pages 617-627
In the psychological noise evaluation, the fuzziness caused by the human subjective judgment for the acoustical stimulus is inevitably obscure. From the above viewpoints, in this paper, the relationship between the physical sound insulation method and the psychological noise evaluation method for fluctuating random noise is considered, by using the fuzzy set theory. That is, A set of eight simplified patterns of the membership functions are first established by using the actually observed data for psychological impression. Next, a new systematical method for estimating and/or predicting the psychological impression by using the above simplified membership functions is proposed, in the case when the two physical characteristics of noise stimulus (the sound pressure level probability distribution and the power spectral density) being changed by the erection of the sound insulation barrier.