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#!/usr/bin/env python
#
# Copyright 2012,2013 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.
#
import cmath
from gnuradio import gr, gr_unittest, analog, blocks
class test_quadrature_demod(gr_unittest.TestCase):
def setUp(self):
self.tb = gr.top_block()
def tearDown(self):
self.tb = None
def test_quad_demod_001(self):
f = 1000.0
fs = 8000.0
src_data = []
for i in xrange(200):
ti = i/fs
src_data.append(cmath.exp(2j*cmath.pi*f*ti))
# f/fs is a quarter turn per sample.
# Set the gain based on this to get 1 out.
gain = 1.0/(cmath.pi/4)
expected_result = [0,] + 199*[1.0]
src = blocks.vector_source_c(src_data)
op = analog.quadrature_demod_cf(gain)
dst = blocks.vector_sink_f()
self.tb.connect(src, op)
self.tb.connect(op, dst)
self.tb.run()
result_data = dst.data()
self.assertComplexTuplesAlmostEqual(expected_result, result_data, 5)
if __name__ == '__main__':
gr_unittest.run(test_quadrature_demod, "test_quadrature_demod.xml")
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