我使用以下代码在python中实现了高通滤波器:
from scipy.signal import butter, filtfilt
import numpy as np
def butter_highpass(cutoff, fs, order=5):
nyq = 0.5 * fs
normal_cutoff = cutoff / nyq
b, a = butter(order, normal_cutoff, btype='high', analog=False)
return b, a
def butter_highpass_filter(data, cutoff, fs, order=5):
b, a = butter_highpass(cutoff, fs, order=order)
y = filtfilt(b, a, data)
return y
rawdata = np.loadtxt('sampleSignal.txt', skiprows=0)
signal = rawdata
fs = 100000.0
cutoff = 100
order = 6
conditioned_signal = butter_highpass_filter(signal, cutoff, fs, order)
我在100 kHz电压信号上应用此滤波器,它对于> = 60 Hz的截止频率工作正常.但它在下面不起作用.我想切断低于10赫兹的所有频率.我的错误是什么提示？我观察到的是滤波器的阶数越低,截止频率就越低.