Method of smoothing output frequency of pressure sensor, tsunami warning device by atmospheric pressure observation using it, tsunami warning system

摘要

PROBLEM TO BE SOLVED: To provide a method of pressure sensor output frequency smoothing, which enables an accurate smoothing process.SOLUTION: A method of pressure sensor output frequency smoothing involves smoothing a frequency of a square wave generated by a pressure sensor, and is characterized in that a smoothed time series Yfor a time period Xof an i-th square wave is derived by using a formula: Y=(bX+bX-aY)/a...(3) (b=ω, b=ω, a=2/X+ω, a=2/X-ω ...(5), ω=2πfand frepresents a cutoff frequency).SELECTED DRAWING: Figure 2