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#!/usr/bin/env python
#
# Copyright 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.
#
from gnuradio import gr, gr_unittest
import blocks_swig as blocks
import math
def sig_source_f(samp_rate, freq, amp, N):
t = map(lambda x: float(x)/samp_rate, xrange(N))
y = map(lambda x: amp*math.cos(2.*math.pi*freq*x), t)
return y
def sig_source_c(samp_rate, freq, amp, N):
t = map(lambda x: float(x)/samp_rate, xrange(N))
y = map(lambda x: amp*math.cos(2.*math.pi*freq*x) + \
1j*amp*math.sin(2.*math.pi*freq*x), t)
return y
class test_rms(gr_unittest.TestCase):
def setUp(self):
self.tb = gr.top_block()
def tearDown(self):
self.tb = None
def test_ff(self):
amp = 2
src_data = sig_source_f(1, 0.01, amp, 200)
N = 750000
expected_data = amp/math.sqrt(2.0)
src = gr.vector_source_f(src_data, True)
head = gr.head(gr.sizeof_float, N)
op = blocks.rms_ff(0.0001)
dst = gr.vector_sink_f()
self.tb.connect(src, head, op, dst)
self.tb.run()
dst_data = dst.data()
self.assertAlmostEqual(dst_data[-1], expected_data, 4)
def test_cf(self):
amp = 4
src_data = sig_source_c(1, 0.01, amp, 200)
N = 750000
expected_data = amp
src = gr.vector_source_c(src_data, True)
head = gr.head(gr.sizeof_gr_complex, N)
op = blocks.rms_cf(0.0001)
dst = gr.vector_sink_f()
self.tb.connect(src, head, op, dst)
self.tb.run()
dst_data = dst.data()
self.assertAlmostEqual(dst_data[-1], expected_data, 4)
if __name__ == '__main__':
gr_unittest.run(test_rms, "test_rms.xml")
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