python 分帧 加窗

在Python中，进行信号分帧加窗的常用方法有两种。第一种方法是使用Matplotlib库中的stem函数进行可视化绘制，如下所示：

import matplotlib.pyplot as plt
import numpy as np

plt.rcParams['font.family'] = ['sans-serif']
plt.rcParams['font.sans-serif'] = ['SimHei']

N = 32
nn = [i for i in range(N)]

plt.subplot(3, 1, 1)
plt.stem(np.ones(N))
plt.title('(a)矩形窗')

w = 0.54 - 0.46 * np.cos(np.multiply(nn, 2 * np.pi) / (N - 1))
plt.subplot(3, 1, 2)
plt.stem(w)
plt.title('(b)汉明窗')

w = 0.5 * (1 - np.cos(np.multiply(nn, 2 * np.pi) / (N - 1)))
plt.subplot(3, 1, 3)
plt.stem(w)
plt.title('(c)海宁窗')

plt.savefig('images/window.png')
plt.close()

第二种方法是使用scipy库中的signal模块进行窗函数的生成和绘制，如下所示：

import matplotlib.pyplot as plt
import scipy.signal as signal

plt.figure(figsize=(6,2))
plt.plot(signal.hanning(512))
plt.grid()
plt.show()

以上是两种常见的Python代码示例，用于进行信号分帧加窗操作。这些代码可以帮助您实现信号处理中对信号进行窗函数处理的需求。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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