3 # Copyright 2005 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 2, 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., 59 Temple Place - Suite 330,
20 # Boston, MA 02111-1307, USA.
24 Demod FM signal in data collected for radar.
25 Input samples are complex baseband, 250kS/sec.
28 from gnuradio import gr, gru, blks, eng_notation
29 from gnuradio import audio
30 from gnuradio.eng_option import eng_option
31 from optparse import OptionParser
36 class my_graph(gr.flow_graph):
37 def __init__(self, input_filename, repeat):
38 gr.flow_graph.__init__(self)
42 audio_rate = int(baseband_rate // audio_decim) # output is at 31250 S/s
44 src = gr.file_source(gr.sizeof_gr_complex, input_filename, repeat)
45 guts = blks.wfm_rcv(self, baseband_rate, audio_decim)
46 sink = audio.sink(audio_rate, "plughw:0,0")
47 self.connect(src, guts, sink)
50 usage = "usage: %prog [options] filename"
51 parser = OptionParser (option_class=eng_option, usage=usage)
52 parser.add_option ("-r", "--repeat", action="store_true", default=False)
53 (options, args) = parser.parse_args ()
60 my_graph(args[0], options.repeat).run()
61 except KeyboardInterrupt:
65 if __name__ == '__main__':