Fluctuation characteristic measurement for sound environment evaluation

In recent years, the attempt to evaluate the acoustic environment using the flucutua-tion characteristic (power spectral density of fluctuation) has been attracting attention. This paper introduces examples of fluctuation measurement aimed at environment evaluation and examines various problems related to fluctuation characteristic measure-ment of audio signals. Also, the function and composition of a special measurement system for measurement of the “fluctuation characteristic” the fluctuation analyzer, are described in the last part of the text. The authors have begun developing this sys-tem recently with the aim of supporting these studies.