Letter
Trial on Low-Pass Filter Design for Bio-Signal Based on Nonlinear Analysis
2019 年 34 巻 1 号 p. 13-20
詳細
2019 年 34 巻 1 号 p. 13-20
The nonlinearity of the mathematical model describing the cerebral blood flow dynamics and the body sway in the prefrontal cortex was investigated experimentally. The measured bio-signal data were smoothed with each low-pass filter. The signal was set to 0.1-2 Hz for the cerebral blood flow dynamics and to 0.1-20 Hz for the body sway. Nonlinearity was observed in the biological signal when the cut-off frequency of the low-pass filtering was 0.2 Hz or less, and while the body sway was 0.5 Hz or less, and was considered as a stochastic differential equations.
