[英]How to print a amplitude modulated signal using python
I have an matlab example of this program but I can't do it in Python.我有这个程序的 matlab 示例,但我无法在 Python 中执行此操作。 How it must look like (mathlab example) https://imgur.com/a/oam3jXl .
它的外观(数学实验室示例) https://imgur.com/a/oam3jXl 。
import numpy as np
import matplotlib.pyplot as plt
from scipy.signal import hilbert, chirp
duration = int(input("Input duration of signal = "))
A = int(input("Input amplitude of signal = "))
start = int(input("Input start of modulation time = "))
end = int(input("Input lenght of modulation = "))
fs = 400.0
samples = int(fs*duration)
t = np.arange(samples) / fs
main_t = []
result = []
counter=0
for l in range(0,samples):
main_t.append(0)
result.append(0)
start_mod = np.arange(start*fs)
end_mod = np.arange(end*fs)
signal = chirp(t, 20.0, t[-1], 100.0)
signal *= (A + 0.5 * np.sin(2.0*np.pi*3.0*t) )
for i in np.arange(0,start*fs):
signal.insert(i,0)
fig = plt.figure()
ax0 = fig.add_subplot(211)
ax0.plot(main_t, result)
ax0.set_xlabel("time in seconds")
plt.show()
I expect the inputing some data from console and then print graph using matplotlib for example.我希望从控制台输入一些数据,然后使用 matplotlib 打印图形。 Graph must look like graph that u can see on image(mathlab example).
图形必须看起来像您可以在图像上看到的图形(数学实验室示例)。
Ignoring all the fiddling with getting input (which will vary a lot depending on other constraints), the code to generate an amplitude modulated signal should be simple.忽略对获取输入的所有摆弄(这将根据其他约束而有很大差异),生成调幅信号的代码应该很简单。
I start by pulling in numpy, generating a set of points on which to sample the signal, calculating an amplitude, then combine them:我首先引入 numpy,生成一组对信号进行采样的点,计算幅度,然后将它们组合起来:
import numpy as np
x = np.linspace(0, 10, 501)
ampl = np.exp(-(x - 3.5)**2 / 0.8)
y = np.sin(x * 25) * ampl
we can then plot these using matplotlib with something like:然后我们可以使用 matplotlib 绘制这些图,例如:
import matplotlib.pyplot as plt
plt.figure(figsize=(10,5))
plt.plot(x, y, label='signal')
plt.plot(x, ampl, ':', label='amplitude')
plt.xlabel('time')
plt.ylabel('value')
plt.legend()
I've pulled in seaborn and am using their ticks
style to make it a bit prettier.我已经加入了 seaborn 并使用他们的
ticks
风格使它更漂亮一些。
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