/
test_stft.py
executable file
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test_stft.py
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#!/usr/bin/env python
import unittest
from stft import window_nonzero, create_overlapping_segments, stft, istft
from stft import istft
import numpy as np
from scipy.signal.windows import boxcar, hann, tukey
class TestCode(unittest.TestCase):
def test_window_nonzero(self):
"""Test window_nonzero function"""
# boxcar window
segment_length = 16
window_function = boxcar
window_vector = window_nonzero(window_function, segment_length)
self.assertTrue(segment_length == np.count_nonzero(window_vector))
# hann window has zeros on the ends
segment_length = 16
window_function = hann
window_vector = window_nonzero(window_function, segment_length)
self.assertTrue(segment_length == np.count_nonzero(window_vector))
# tukey has zeros on the ends
segment_length = 16
window_function = tukey
window_vector = window_nonzero(window_function, segment_length)
self.assertTrue(segment_length == np.count_nonzero(window_vector))
def test_create_overlapping_segments(self):
"""Test create_overlapping_segments"""
x = np.arange(16)
segment_length = 4
shift_length = 2
x_segments, start_list, stop_list = create_overlapping_segments(x,
segment_length, shift_length)
self.assertTrue(x_segments.shape[0] == segment_length)
self.assertTrue(x_segments.shape[1] == 7)
x = np.arange(16)
segment_length = 16
shift_length = 2
x_segments, start_list, stop_list = create_overlapping_segments(x,
segment_length, shift_length)
self.assertTrue(x_segments.shape[0] == segment_length)
self.assertTrue(x_segments.shape[1] == 1)
x = np.arange(16)
segment_length = 8
shift_length = 5
x_segments, start_list, stop_list = create_overlapping_segments(x,
segment_length, shift_length)
self.assertTrue(x_segments.shape[0] == segment_length)
self.assertTrue(x_segments.shape[1] == 3)
x = np.random.randn(16, 16, 16)
segment_length = 8
shift_length = 5
x_segments, start_list, stop_list = create_overlapping_segments(x,
segment_length, shift_length)
# check shape of x_segments
self.assertTrue(x_segments.shape[0] == segment_length)
self.assertTrue(x_segments.shape[1] == 3)
self.assertTrue(x_segments.shape[2] == 16)
self.assertTrue(x_segments.shape[3] == 16)
# check first segment
self.assertTrue(np.allclose(x[0:segment_length, 0, 0], x_segments[:, 0, 0, 0]))
# check last segment
self.assertTrue(np.allclose(x[8:16, -1, -1], x_segments[:, -1, -1, -1]))
def test_stft(self):
"""Test stft"""
x = np.ones(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = boxcar
# take stft
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
# setup what stft output should be
x_stft_true = np.zeros((3, 7))
x_stft_true[0] = 4
self.assertTrue( np.allclose(x_stft, x_stft_true) )
x = np.ones(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = hann
# take stft
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
# setup what stft output should be
window_vector = window_nonzero(hann, segment_length)
x_stft_true = np.zeros((3, 7), dtype=np.complex)
window_vector_fft = np.fft.rfft(window_vector)
x_stft_true[0] = window_vector_fft[0]
x_stft_true[1] = window_vector_fft[1]
x_stft_true[2] = window_vector_fft[2]
self.assertTrue( np.allclose(x_stft, x_stft_true) )
x = np.ones((16, 2, 2))
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = boxcar
# take stft
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
# setup what stft output should be
x_stft_true = np.zeros((3, 7, 2, 2))
x_stft_true[0] = 4
self.assertTrue( np.allclose(x_stft, x_stft_true) )
x = np.ones((16, 2, 2))
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = hann
# take stft
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
# setup what stft output should be
window_vector = window_nonzero(hann, segment_length)
x_stft_true = np.zeros((3, 7, 2, 2), dtype=np.complex)
window_vector_fft = np.fft.rfft(window_vector)
x_stft_true[0] = window_vector_fft[0]
x_stft_true[1] = window_vector_fft[1]
x_stft_true[2] = window_vector_fft[2]
self.assertTrue( np.allclose(x_stft, x_stft_true) )
def test_istft(self):
"""Test istft"""
x = np.ones(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = boxcar
original_size = x.shape
p = 1
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.random.randn(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = boxcar
original_size = x.shape
p = 1
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.random.randn(16, 2, 2)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = boxcar
original_size = x.shape
p = 1
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.ones(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = hann
original_size = x.shape
p = 1
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.ones(16)
segment_length = 4
shift_length = 4
segment_length_padded = 4
window_function = hann
original_size = x.shape
p = 2
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.ones(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = boxcar
original_size = x.shape
p = 2
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.ones(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = hann
original_size = x.shape
p = 2
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.random.randn(16)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = hann
original_size = x.shape
p = 2
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.random.randn(16, 3)
segment_length = 4
shift_length = 2
segment_length_padded = 4
window_function = hann
original_size = x.shape
p = 2
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
x = np.ones(16)
segment_length = 4
shift_length = 2
segment_length_padded = 7
window_function = boxcar
original_size = x.shape
p = 1
x_stft, start_list, stop_list = stft(x, segment_length,
segment_length_padded, shift_length, window_function)
x_out = istft(x_stft, segment_length, segment_length_padded,
start_list, stop_list,
original_size, window_function, p)
self.assertTrue( np.allclose(x_out, x))
if __name__ == '__main__':
print("Running unit tests for stft.py")
unittest.main()