61 lines
1.3 KiB
Python
61 lines
1.3 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Mon Jan 15 19:45:33 2018
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@author: anne
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"""
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import numpy as np
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from lasp import AvPowerSpectra, Window
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def test_aps1():
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nfft = 16384
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fs = 48000
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tend = 10
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t = np.linspace(0, (tend*fs)//fs, int(fs*tend), endpoint=False)
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w = Window.WindowType.Hann
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# w = Window.WindowType.Rectangular
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aps = AvPowerSpectra(nfft, w, 50, -1)
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sig = np.random.randn(int(fs*tend))
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cps = aps.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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# Check for Parseval
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assert np.isclose(pow2 - pow1,0, atol=1e-2)
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def test_aps2():
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"""
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Test whether we are able to estimate a simple transfer function of a gain
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of 2 between two channels
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"""
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nfft = 16384
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fs = 48000
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tend = 10
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t = np.linspace(0, (tend*fs)//fs, int(fs*tend), endpoint=False)
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# w = Window.WindowType.Hann
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w = Window.WindowType.Rectangular
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aps = AvPowerSpectra(nfft, w, 50, -1)
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sig1 = np.random.randn(int(fs*tend))
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sig2 = 2*sig1
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sig = np.concatenate((sig1[None,:], sig2[None,:])).T
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cps = aps.compute(sig)
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H = cps[:,0,1]/cps[:,0,0]
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# Check if transfer function is obtained
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assert np.all(np.isclose(H,2))
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if __name__ == '__main__':
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test_aps1()
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