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Examples of time domain waveforms and spectrograms of sinusoidal signals based on matplotlib Python
Examples of time domain waveforms and spectrograms of sinusoidal signals based on matplotlib Python
This article mainly introduces Python to implement the time domain waveform and spectrogram of sinusoidal signals, involving Python mathematical operations and graphics drawing related operating skills. Friends in need can refer to the following
The examples in this article describe the Python implementation Time domain waveforms and spectrograms of sinusoidal signals. Share it with everyone for your reference, the details are as follows:
# -*- coding: utf-8 -*- # 正弦信号的时域波形与频谱图 import numpy as np import matplotlib.pyplot as pl import matplotlib import math import random row = 4 col = 4 N = 500 fs = 5 n = [2*math.pi*fs*t/N for t in range(N)] # 生成了500个介于0.0-31.35之间的点 # print n axis_x = np.linspace(0,3,num=N) #频率为5Hz的正弦信号 x = [math.sin(i) for i in n] pl.subplot(221) pl.plot(axis_x,x) pl.title(u'5Hz的正弦信号',fontproperties='SimHei') pl.axis('tight') #频率为5Hz、幅值为3的正弦+噪声 x1 = [random.gauss(0,0.5) for i in range(N)] xx = [] #有没有直接两个列表对应项相加的方式？？ for i in range(len(x)): xx.append(x[i]*3 + x1[i]) pl.subplot(222) pl.plot(axis_x,xx) pl.title(u'频率为5Hz、幅值为3的正弦+噪声',fontproperties='SimHei') pl.axis('tight') #频谱绘制 xf = np.fft.fft(x) xf_abs = np.fft.fftshift(abs(xf)) axis_xf = np.linspace(-N/2,N/2-1,num=N) pl.subplot(223) pl.title(u'频率为5Hz的正弦频谱图',fontproperties='SimHei') pl.plot(axis_xf,xf_abs) pl.axis('tight') #频谱绘制 xf = np.fft.fft(xx) xf_abs = np.fft.fftshift(abs(xf)) pl.subplot(224) pl.title(u'频率为5Hz的正弦频谱图',fontproperties='SimHei') pl.plot(axis_xf,xf_abs) pl.axis('tight') pl.show()
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