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#!/usr/bin/env python
#
# Copyright 2006,2007,2010,2012 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, gr_unittest
from math import pi, cos
import fft_swig as fft
class test_goertzel(gr_unittest.TestCase):
def setUp(self):
self.tb = gr.top_block()
def tearDown(self):
self.tb = None
def make_tone_data(self, rate, freq):
return [cos(2*pi*x*freq/rate) for x in range(rate)]
def transform(self, src_data, rate, freq):
src = gr.vector_source_f(src_data, False)
dft = fft.goertzel_fc(rate, rate, freq)
dst = gr.vector_sink_c()
self.tb.connect(src, dft, dst)
self.tb.run()
return dst.data()
def test_001(self): # Measure single tone magnitude
rate = 8000
freq = 100
bin = freq
src_data = self.make_tone_data(rate, freq)
expected_result = 0.5
actual_result = abs(self.transform(src_data, rate, bin)[0])
self.assertAlmostEqual(expected_result, actual_result, places=4)
def test_002(self): # Measure off frequency magnitude
rate = 8000
freq = 100
bin = freq/2
src_data = self.make_tone_data(rate, freq)
expected_result = 0.0
actual_result = abs(self.transform(src_data, rate, bin)[0])
self.assertAlmostEqual(expected_result, actual_result, places=4)
if __name__ == '__main__':
gr_unittest.run(test_goertzel, "test_goertzel.xml")
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