python/tests/test_filterbank_mel.py

   1 #! /usr/bin/env python
   2
   3 import numpy as np
   4 from numpy.testing import TestCase, assert_equal, assert_almost_equal
   5
   6 from aubio import cvec, filterbank, float_type
   7
   8 import warnings
   9 warnings.filterwarnings('ignore', category=UserWarning, append=True)
  10
  11 class aubio_filterbank_mel_test_case(TestCase):
  12
  13     def test_slaney(self):
  14         f = filterbank(40, 512)
  15         f.set_mel_coeffs_slaney(16000)
  16         a = f.get_coeffs()
  17         assert_equal(np.shape (a), (40, 512/2 + 1) )
  18
  19     def test_other_slaney(self):
  20         f = filterbank(40, 512*2)
  21         f.set_mel_coeffs_slaney(44100)
  22         self.assertIsInstance(f.get_coeffs(), np.ndarray)
  23         #print "sum is", sum(sum(a))
  24         for win_s in [256, 512, 1024, 2048, 4096]:
  25             f = filterbank(40, win_s)
  26             f.set_mel_coeffs_slaney(32000)
  27             #print "sum is", sum(sum(a))
  28             self.assertIsInstance(f.get_coeffs(), np.ndarray)
  29
  30     def test_triangle_freqs_zeros(self):
  31         f = filterbank(9, 1024)
  32         freq_list = [40, 80, 200, 400, 800, 1600, 3200, 6400, 12800, 15000, 24000]
  33         freqs = np.array(freq_list, dtype = float_type)
  34         f.set_triangle_bands(freqs, 48000)
  35         assert_equal ( f(cvec(1024)), 0)
  36         self.assertIsInstance(f.get_coeffs(), np.ndarray)
  37
  38     def test_triangle_freqs_ones(self):
  39         f = filterbank(9, 1024)
  40         freq_list = [40, 80, 200, 400, 800, 1600, 3200, 6400, 12800, 15000, 24000]
  41         freqs = np.array(freq_list, dtype = float_type)
  42         f.set_triangle_bands(freqs, 48000)
  43         self.assertIsInstance(f.get_coeffs(), np.ndarray)
  44         spec = cvec(1024)
  45         spec.norm[:] = 1
  46         assert_almost_equal ( f(spec),
  47                 [ 0.02070313, 0.02138672, 0.02127604, 0.02135417,
  48                     0.02133301, 0.02133301, 0.02133311, 0.02133334, 0.02133345])
  49
  50 if __name__ == '__main__':
  51     import nose2
  52     nose2.main()