File:Periodogram windows.svg
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Summary[edit]
| Description |
English: Two power spectra calculated by the periodogram method. |
| Date | |
| Source | Own work based on code from File:Periodogram windows.png by Kirlf (talk · contribs) |
| Author | Ixfd64 |
Source code[edit]
import numpy as np
from scipy import signal
import matplotlib.pyplot as plt
w_1 = 40 # frequency of the 1st component of the signal (Hz)
w_2 = 60 # frequency of the 2nd component of the signal (Hz)
a = 0.5 # magnitude of the 1st component of the signal
b = 1.0 # magnitude of the 2nd component of the signal
t = np.array([i for i in range(1, 301)]) / 1000 # time samples (s)
fs = 1 / (t[1] - t[0]) # sampling frequency (Hz)
x = a * np.cos(2 * np.pi * w_1 * t) + b * np.sin(2 * np.pi * w_2 * t) # considered signal
n = .2 * np.random.randn(len(t)) # white Gaussian noise
y = x + n
windows = [None, 'hamming']
for window in windows:
if window is None:
label = 'rect'
else:
label = window
f, Pxx_den = signal.periodogram(y, fs=fs, scaling='spectrum', nfft=2048, window=window)
plt.semilogy(f[1:200], Pxx_den[1:200], label=label)
plt.ylabel('Spectrum')
plt.xlabel('Frequencies (Hz)')
plt.title('Periodogram')
plt.grid(True)
plt.legend()
plt.savefig("Periodogram windows.svg")
Licensing[edit]
I, the copyright holder of this work, hereby publish it under the following license:
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- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:49, 2 May 2023 | | 576 × 432 (52 KB) | Ixfd64 (talk | contribs) | Uploaded own work with UploadWizard |
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