Abstract
Various sounds exist in the environment that we live. It is known that these sounds influence man's psychology or the physiology. By the way, there are not a lot of researches on the good influence that the sound exerts on man. Then, we applied the focus to the sound that existed in the forest and meadow, and evaluated the characteristic of these sounds. Moreover, the influence that the sound of nature exerted on man's psychology was examined by the questionnaire survey simultaneously with this. The relation between the frequency and the power spectrum was clarified by using the FFT method about properties of sound. Moreover, the influence on man's psychology did the principal component analysis that used the semantic differential method. The influence that the frequency response of the sound that existed in natural environment exerted on man's psychology was quantified by synthesizing these analytical results.
