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#!/usr/bin/env python
#
# Copyright 2005 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 2, 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.
#
#
# All Your Frequencies are Belong to Us!
#
# Transmit NBFM message on 25 channels simultaneously!
#
from gnuradio import gr, gru, eng_notation
from gnuradio import usrp
from gnuradio import audio
from gnuradio import blks
from gnuradio import optfir
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import math
import sys
import random
from gnuradio.wxgui import stdgui, fftsink
import wx
def make_random_complex_tuple(L):
result = []
for x in range(L):
result.append(complex(random.gauss(0, 1),random.gauss(0, 1)))
return tuple(result)
def random_noise_c():
src = gr.vector_source_c(make_random_complex_tuple(32*1024), True)
return src
def plot_taps(taps, sample_rate=2):
return gru.gnuplot_freqz (gru.freqz (taps, 1), sample_rate)
class ayfabtu_graph (stdgui.gui_flow_graph):
def __init__(self, frame, panel, vbox, argv):
stdgui.gui_flow_graph.__init__ (self, frame, panel, vbox, argv)
parser = OptionParser (option_class=eng_option)
parser.add_option ("-c", "--duc-freq", type="eng_float", default=29.325e6,
help="set Tx ddc frequency to FREQ", metavar="FREQ")
(options, args) = parser.parse_args ()
nchan = 25
IF_GAIN = 80000
AUDIO_GAIN = 100
self.dac_rate = 128e6
self.usrp_interp = 256
self.usrp_rate = self.dac_rate / self.usrp_interp # 500 kS/s
self.audio_rate = 32000 # 32 kS/s
self.audio_src = gr.file_source(gr.sizeof_float, "ayfabtu.dat", True)
ahp_taps = gr.firdes.high_pass(1, # gain
32e3, # Fs
300, # cutoff
600, # trans width
gr.firdes.WIN_HANN)
self.audio_hp = gr.fir_filter_fff(1, ahp_taps)
self.audio_gain = gr.multiply_const_ff(AUDIO_GAIN)
null_src = gr.null_source(gr.sizeof_gr_complex)
#noise_src = gr.noise_source_c(gr.GR_UNIFORM, 1, 0)
noise_src = random_noise_c()
if 0:
artaps = optfir.low_pass(1, # gain
2, # Fs
.75/32, # freq1
1.0/32, # freq2
1, # pb ripple in dB
50, # stopband atten in dB
2) # + extra taps
else:
artaps = gr.firdes.low_pass(1, # gain
32e3*15,# Fs
2.7e3, # cutoff
.3e3, # trans width
gr.firdes.WIN_HANN)
print "len(artaps) =", len(artaps)
self.audio_resampler = blks.rational_resampler_fff(self, 15, 32, artaps)
self.fm_mod = blks.nbfm_tx(self, 15000, 15000, max_dev=4.5e3)
fbtaps = gr.firdes.low_pass(1, # gain
25*15e3, # rate
13e3, # cutoff
2e3, # trans width
gr.firdes.WIN_HANN)
print "len(fbtabs) =", len(fbtaps)
#self.plot = plot_taps(fbtaps, 25*15e3)
self.filter_bank = blks.synthesis_filterbank(self, nchan, fbtaps)
self.if_gain = gr.multiply_const_cc(IF_GAIN)
if 0:
ifrtaps = optfir.low_pass(1,
2, # Fs
.75/3, # freq1
1.0/3, # freq2
1, # pb ripple in dB
50, # stopband atten in dB
2) # + extra taps
else:
ifrtaps = gr.firdes.low_pass(1,
2, # Fs
.75/3, # freq1
.25/3, # trans width
gr.firdes.WIN_HANN)
print "len(ifrtaps) =", len(ifrtaps)
self.if_resampler = blks.rational_resampler_ccf(self, 4, 3, ifrtaps)
self.u = usrp.sink_c(0, 256)
self.u.set_tx_freq(0, options.duc_freq)
self.u.set_pga(0, self.u.pga_max())
# wire it all together
self.connect(self.audio_src, self.audio_hp, self.audio_gain,
self.audio_resampler, self.fm_mod)
null_sink = gr.null_sink(gr.sizeof_gr_complex)
for i in range(nchan):
if True or i == 0:
self.connect(self.fm_mod, (self.filter_bank, i))
else:
self.connect(null_src, (self.filter_bank, i))
self.connect(self.filter_bank, self.if_gain, self.if_resampler, self.u)
def main ():
app = stdgui.stdapp (ayfabtu_graph, "All Your Frequency Are Belong to Us")
app.MainLoop ()
if __name__ == '__main__':
main ()
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