J.A. de Jong - Redu-Sone B.V., ASCEE V.O.F
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37 lines
741 B
Python
37 lines
741 B
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Testing code for power spectra
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"""
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import numpy as np
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from lasp import PowerSpectra, Window
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def test_ps():
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"""
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Check Parsevall for single-sided power spectra
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"""
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nfft = 2048
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t = np.linspace(0, 1.0, nfft, endpoint=False)
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ps = PowerSpectra(nfft, Window.WindowType.Rectangular)
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sig = np.random.randn(nfft)
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freq = 4
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omg = 2*np.pi*freq
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# sig = 8*np.cos(omg*t)
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cps = ps.compute(sig[:,None])
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pow1 = np.sum(sig**2)/sig.size
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pow2 = np.sum((cps[:,0,0]).real)
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# print(pow1)
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# print(pow2)
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# plt.plot(cps[:,0,0])
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assert np.isclose(pow2 - pow1,0, atol=1e-1)
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if __name__ == '__main__':
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test_ps()
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