python signal测试的使用 python信号处理函数的使用测试 from scipy import signal
提供python2示例代码
import numpy as np
from scipy import signal
import matplotlib.pyplot as plt
b1 = signal.firwin(40,0.5)
b2 = signal.firwin(41,[0.3,0.8])
w1,h1 = signal.freqz(b1)
w2,h2 = signal.freqz(b2)
plt.title('Digital filter frequency response')
plt.plot(w1,20*np.log10(np.abs(h1)),'b')
plt.plot(w2,20*np.log10(np.abs(h2)),'r')
plt.ylabel('Amplitude Response (dB)')
plt.xlabel('Frequency (rad/sample)')
plt.grid()
plt.show()
fs = 10e
