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test_adc_delay.py
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test_adc_delay.py
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# -*- coding: utf-8 -*-
"""
Created on Tue Nov 21 11:34:59 2017
@author: tbeleyur
"""
from os import path
import unittest
from scipy import signal
import numpy as np
from ADC_delay import *
class TestADC_delay(unittest.TestCase):
def setUp(self):
fs,self.rec1 = read_wavfile('DEVICE1_2017-11-21-10_44_20.wav')
fs,self.rec2 = read_wavfile('DEVICE2_2017-11-21-10_44_20.wav')
# create a 16 channel recording with 30 samples delay between device 1
# (channels 0:7, and device 2, channels 8:15)
self.rec_durn = 0.8
self.multich_rec = np.random.normal(0,0.5,int(self.rec_durn*fs*16)).reshape((-1,16))
self.t = np.linspace(0,self.rec_durn,int(self.rec_durn*fs))
FPS = 25
self.sine_t = np.sin(2*np.pi*self.t*FPS - np.pi)
self.sync_signal = signal.square(self.sine_t)
self.adc_delay = 300 # the delay in AD conversion between the two devices
self.pbk_delay = int(0.2*fs) # simulate the delay due to the DAC of the playback
#assign channels 7 and 15 to the sync signal and mimic the experimental delays induced
# during recording
self.multich_rec[:,7] = np.roll(self.sync_signal,self.pbk_delay)
self.multich_rec[:self.pbk_delay,7] = 0
self.multich_rec[:,15] = np.roll(self.sync_signal,self.pbk_delay+self.adc_delay)
self.multich_rec[:self.adc_delay+self.pbk_delay,15] = 0
def test_delayestimation(self) :
'''
has to have a test_ otherwise the method won't be run !!
'''
# test with two exact replicas of a signal shifted by a few indices
x = np.random.normal(0,1,10000)
y = np.copy(x)
delay_inds = 3
y = np.roll(y,delay_inds);
delay = estimate_delay(y,x)
self.assertEqual(delay_inds,delay)
# now test with real wav files of the square sync signals:
actual_delay = estimate_delay(self.rec2,self.rec1,10**5)
known_delay = -28
self.assertEqual(known_delay,actual_delay)
pass
def test_detect_firstrisingedge(self):
print('test_detect_firstrisingedge \n')
fs = 192000
sync_freq = 25
one_cycledurn = 1.0/sync_freq
t = np.linspace(0,one_cycledurn,int(fs*one_cycledurn))
sine_fn = 2*np.pi*sync_freq*t + np.pi
sync_signal = np.float32( signal.square(sine_fn,0.5) )
continuous_sync = np.tile(sync_signal,10)
samples_silence = 1000
test_signal = np.concatenate((np.zeros(samples_silence),continuous_sync))
first_peak_notemplate = detect_first_rising_edge(test_signal, fs=192000)
risingedge_index = t.size/2 + samples_silence
self.assertEqual(first_peak_notemplate,risingedge_index)
first_peak_withtemplate = detect_first_rising_edge(test_signal,fs=192000,template=sync_signal)
self.assertEqual(first_peak_withtemplate,risingedge_index)
# now try with a weird sync signal - it should throw a warning but still
# return the correct first rising edge:
jittered_syncsignal = np.concatenate((test_signal,np.zeros(samples_silence),test_signal))
peak1_wjittered = detect_first_rising_edge(jittered_syncsignal,fs=192000)
self.assertEqual(peak1_wjittered,risingedge_index)
pass
def test_alignchannels(self):
print('test_alignchannels \n')
#align_channels(multichannel_rec, channel2device,cut_points={'ADC1':0,'ADC2':0})
print('test_alignchannels')
ch2device = {'1':range(8),'2':range(8,16)}
cutpoints = {'1':self.pbk_delay,'2':self.pbk_delay+self.adc_delay}
timealigned_rec = align_channels(self.multich_rec,ch2device,cutpoints)
# check if the values of the sync signal are the same - to make sure they are time aligned !
try:
np.testing.assert_array_almost_equal(timealigned_rec[:,7],timealigned_rec[:,15])
except:
raise ValueError('The sync channels are not lined up! ')
#self.assertEqual(timealigned_rec[index_common,7],timealigned_rec[index_common,15])
pass
def test_timealign_channels(self):
'''
check how all of the functions behave together and see if it throws any
errors
'''
print('test_timealign_channels \n')
fs = 192000
nchannels = 16
multich_rec2 = np.random.normal(0,0.5,int(self.rec_durn*fs*nchannels)).reshape((-1,nchannels))
adc_delay2 = 50
pbk_delay2 = int(0.1*fs)
multich_rec2[:,7] = np.roll(self.sync_signal,pbk_delay2)
multich_rec2[:pbk_delay2,7] = 0
multich_rec2[:,15] = np.roll(self.sync_signal,pbk_delay2+adc_delay2)
multich_rec2[:adc_delay2+pbk_delay2,15] = 0
ch2devs = {'1':range(8),'2':range(8,16)}
sync2devs = {'1':7,'2':15}
ta_channels = timealign_channels(multich_rec2,192000, ch2devs,sync2devs,with_sync=True)
try:
np.testing.assert_array_almost_equal(ta_channels[:,7],ta_channels[:,15])
except:
raise ValueError('The sync channels are not lined up! ')
def test_checkifconcatenationworksproperly(self):
'''
Are the channels getting cut and assembled properly back together ?
Assign all values in each column their channel number and recreate
playback delay + ADC delay across 2 devices.
Recreate the sync signal playback delay and ADc delay.
Run through time_align and check if the first samples of all channels
(without the sync signal) are returned in the expected order
'''
print('\n test_ifconcatenationworks')
fs = 192000
nchannels = 16
unique_channel_rec = np.zeros((fs,nchannels))
channels2devs = {'1':range(8),'2':range(8,16)}
audiochannels2devs = { '1': range(7),'2': range(8,15)}
syncchannels2devs ={'1':7,'2':15}
pbk_delay = int(0.2*fs)
adc_delay = 40
delays2devs = {'1':pbk_delay,'2':adc_delay+pbk_delay}
#assign channel values to all the audio channels
i = 0
for device,device_channels in audiochannels2devs.items():
samples_delay = delays2devs[device]
for each_channel in device_channels:
unique_channel_rec[samples_delay:,each_channel] = i
i += 1
# create sync channels:
t = np.linspace(0,1,fs)
sine = np.sin(2*np.pi*25*t - np.pi)
sync = signal.square(sine)
for device,ch_index in syncchannels2devs.items():
unique_channel_rec[ delays2devs[device]:,ch_index] = sync[:-delays2devs[device]]
print(' \n '+str(unique_channel_rec[0,:]))
test_timealign = timealign_channels(unique_channel_rec,fs,channels2devs,syncchannels2devs)
expected_firstsamples = np.array(range(nchannels-2))
same_arrays = expected_firstsamples == test_timealign[0:,:]
self.assertTrue(np.all(same_arrays))
def test_checkforoverlaps_list(self):
print('\n test_checkforoverlaps_list')
ch1 = [0,1,2,3,4]
ch2 = [5,6,7,8]
ch2dev_test1 = {'1':ch1,'2':ch2}
self.assertFalse(check_for_overlaps(ch2dev_test1))
ch2dev_test2 = {'1':[0,1,2,3],'2':[2,3]} # with overlap
try:
check_for_overlaps(ch2dev_test2)
except ValueError, E:
self.assertEquals('Some channels may have been specified twice across different devices!',
E.message)
pass
def test_checkforoverlaps_int(self):
sync2dev_case1 = {'1':1,'2':2}
self.assertFalse(check_for_overlaps(sync2dev_case1))
sync2dev_case2 = {'1':1,'2':1}
try:
check_for_overlaps(sync2dev_case2)
except ValueError, E:
self.assertEquals('Some channels may have been specified twice across different devices!',
E.message)
if __name__ == '__main__':
unittest.main()