python/tests/test_filterbank.py

   1 #! /usr/bin/env python
   2
   3 from unittest import main
   4 from numpy.testing import TestCase
   5 from numpy.testing import assert_equal, assert_almost_equal
   6 import numpy as np
   7 from aubio import cvec, filterbank, float_type
   8 from .utils import array_from_text_file
   9
  10 class aubio_filterbank_test_case(TestCase):
  11
  12     def test_members(self):
  13         f = filterbank(40, 512)
  14         assert_equal ([f.n_filters, f.win_s], [40, 512])
  15
  16     def test_set_coeffs(self):
  17         f = filterbank(40, 512)
  18         r = np.random.random([40, int(512 / 2) + 1]).astype(float_type)
  19         f.set_coeffs(r)
  20         assert_equal (r, f.get_coeffs())
  21
  22     def test_phase(self):
  23         f = filterbank(40, 512)
  24         c = cvec(512)
  25         c.phas[:] = np.pi
  26         assert_equal( f(c), 0);
  27
  28     def test_norm(self):
  29         f = filterbank(40, 512)
  30         c = cvec(512)
  31         c.norm[:] = 1
  32         assert_equal( f(c), 0);
  33
  34     def test_random_norm(self):
  35         f = filterbank(40, 512)
  36         c = cvec(512)
  37         c.norm[:] = np.random.random((int(512 / 2) + 1,)).astype(float_type)
  38         assert_equal( f(c), 0)
  39
  40     def test_random_coeffs(self):
  41         win_s = 128
  42         f = filterbank(40, win_s)
  43         c = cvec(win_s)
  44         r = np.random.random([40, int(win_s / 2) + 1]).astype(float_type)
  45         r /= r.sum()
  46         f.set_coeffs(r)
  47         c.norm[:] = np.random.random((int(win_s / 2) + 1,)).astype(float_type)
  48         assert_equal ( f(c) < 1., True )
  49         assert_equal ( f(c) > 0., True )
  50
  51     def test_mfcc_coeffs(self):
  52         f = filterbank(40, 512)
  53         c = cvec(512)
  54         f.set_mel_coeffs_slaney(44100)
  55         c.norm[:] = np.random.random((int(512 / 2) + 1,)).astype(float_type)
  56         assert_equal ( f(c) < 1., True )
  57         assert_equal ( f(c) > 0., True )
  58
  59     def test_mfcc_coeffs_16000(self):
  60         expected = array_from_text_file('filterbank_mfcc_16000_512.expected')
  61         f = filterbank(40, 512)
  62         f.set_mel_coeffs_slaney(16000)
  63         assert_almost_equal ( expected, f.get_coeffs() )
  64
  65 class aubio_filterbank_wrong_values(TestCase):
  66
  67     def test_negative_window(self):
  68         self.assertRaises(ValueError, filterbank, 40, -20)
  69
  70     def test_negative_filters(self):
  71         self.assertRaises(ValueError, filterbank, -40, 1024)
  72
  73     def test_filterbank_long_cvec(self):
  74         f = filterbank(40, 512)
  75         with self.assertRaises(ValueError):
  76             f(cvec(1024))
  77
  78     def test_filterbank_short_cvec(self):
  79         f = filterbank(40, 512)
  80         with self.assertRaises(ValueError):
  81             f(cvec(256))
  82
  83 if __name__ == '__main__':
  84     main()