lasp/test/test_aps.py

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