Python数据低通滤波笔记

from cProfile import label
import pandas as pd
import matplotlib.pyplot as plt
from scipy import signal


data = pd.read_table('test.txt')
wn = 2*2/1000  # 截止频率2Hz,采样频率1000Hz
b,a = signal.butter(4,wn,'low')
filtedData = signal.filtfilt(b,a,data.iloc[:,3].values)
plt.figure('current')
plt.plot(data.iloc[:,3].values,label='滤波前')
plt.plot(filtedData,label='滤波后')
plt.show()

效果如下：