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#! /usr/bin/env python
from unittest import main
from numpy.testing import TestCase
from aubio import fvec, zero_crossing_rate
buf_size = 2048
class zero_crossing_rate_test_case(TestCase):
def setUp(self):
self.vector = fvec(buf_size)
def test_zeroes(self):
""" check zero crossing rate on a buffer of 0. """
self.assertEqual(0., zero_crossing_rate(self.vector))
def test_ones(self):
""" check zero crossing rate on a buffer of 1. """
self.vector[:] = 1.
self.assertEqual(0., zero_crossing_rate(self.vector))
def test_impulse(self):
""" check zero crossing rate on a buffer with an impulse """
self.vector[int(buf_size / 2)] = 1.
self.assertEqual(0., zero_crossing_rate(self.vector))
def test_negative_impulse(self):
""" check zero crossing rate on a buffer with a negative impulse """
self.vector[int(buf_size / 2)] = -1.
self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
def test_single(self):
""" check zero crossing rate on single crossing """
self.vector[int(buf_size / 2) - 1] = 1.
self.vector[int(buf_size / 2)] = -1.
self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
def test_single_with_gap(self):
""" check zero crossing rate on single crossing with a gap"""
self.vector[int(buf_size / 2) - 2] = 1.
self.vector[int(buf_size / 2)] = -1.
self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))
if __name__ == '__main__':
main()
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