python/tests/test_zero_crossing_rate.py

   1 #! /usr/bin/env python
   2
   3 from numpy.testing import TestCase
   4 from aubio import fvec, zero_crossing_rate
   5
   6 buf_size = 2048
   7
   8 class zero_crossing_rate_test_case(TestCase):
   9
  10     def setUp(self):
  11         self.vector = fvec(buf_size)
  12
  13     def test_zeroes(self):
  14         """ check zero crossing rate on a buffer of 0. """
  15         self.assertEqual(0., zero_crossing_rate(self.vector))
  16
  17     def test_ones(self):
  18         """ check zero crossing rate on a buffer of 1. """
  19         self.vector[:] = 1.
  20         self.assertEqual(0., zero_crossing_rate(self.vector))
  21
  22     def test_impulse(self):
  23         """ check zero crossing rate on a buffer with an impulse """
  24         self.vector[int(buf_size / 2)] = 1.
  25         self.assertEqual(0., zero_crossing_rate(self.vector))
  26
  27     def test_negative_impulse(self):
  28         """ check zero crossing rate on a buffer with a negative impulse """
  29         self.vector[int(buf_size / 2)] = -1.
  30         self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
  31
  32     def test_single(self):
  33         """ check zero crossing rate on single crossing """
  34         self.vector[int(buf_size / 2) - 1] = 1.
  35         self.vector[int(buf_size / 2)] = -1.
  36         self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
  37
  38     def test_single_with_gap(self):
  39         """ check zero crossing rate on single crossing with a gap"""
  40         self.vector[int(buf_size / 2) - 2] = 1.
  41         self.vector[int(buf_size / 2)] = -1.
  42         self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
  43
  44 if __name__ == '__main__':
  45     from unittest import main
  46     main()