3 # Copyright 2006,2007,2010 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 from gnuradio import gr, gr_unittest
24 from math import pi, cos
26 class test_goertzel(gr_unittest.TestCase):
29 self.tb = gr.top_block()
34 def make_tone_data(self, rate, freq):
35 return [cos(2*pi*x*freq/rate) for x in range(rate)]
37 def transform(self, src_data, rate, freq):
38 src = gr.vector_source_f(src_data, False)
39 dft = gr.goertzel_fc(rate, rate, freq)
40 dst = gr.vector_sink_c()
41 self.tb.connect(src, dft, dst)
45 def test_001(self): # Measure single tone magnitude
49 src_data = self.make_tone_data(rate, freq)
51 actual_result = abs(self.transform(src_data, rate, bin)[0])
52 self.assertAlmostEqual(expected_result, actual_result, places=4)
54 def test_002(self): # Measure off frequency magnitude
58 src_data = self.make_tone_data(rate, freq)
60 actual_result = abs(self.transform(src_data, rate, bin)[0])
61 self.assertAlmostEqual(expected_result, actual_result, places=4)
63 if __name__ == '__main__':
64 gr_unittest.run(test_goertzel, "test_goertzel.xml")