This paper describes two aspects of sound fluctuation which are important when adapting sound fluctuation technology to the evaluation and control of sound environments: one is the physical evaluation of fluctuation characteristics and the other is the psychological-physiological effects of fluctuation sound on human beings.
This paper first discusses several issues concerning measurement or analysis of fluctuation characteristics including new proposals by the authors: (1) a physical parameter representing amplitude fluctuation, (2) a regression analysis method for deriving the fluctuation coefficient, (3) the fluctuation frequency range of regression analysis for deriving the fluctuation coefficient, and (4) quantitative evaluation indices for sound fluctuation.
The paper then describes psychological-physiological effects of fluctuation noises, which are expected to be used as environmental sound. The potential of fluctuation noise as an environmental sound are investigated through two kinds of experiments on noise masking system. The experiments shows the high potential of 1/f type fluctuation noises as an environment control methodology, even though the subjective impression of fluctuation noise itself needs to be improved before such noise can be used in practice.
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