The chaotic fluctuation of human voice is possible to calculate by SiCECA (Shiomi's Cerebral Exponent Calculation Algorithm) which adopt time-local definition of chaotic characteristics of time series. As results of experiments, follows were observed in chaotic fluctuation of human voice.
The chaotic fluctuation of human voice, named CE (Cerebral exponent) showed correlation with speaker's psychosomatic condition. The value dependency on individuals was very small. If influences of recording equipments and environment are properly estimated, CE will be useful to evaluate speaker's arousal level.
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