3 # Copyright 2004,2005,2007 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 3, 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., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 # Gang - Here's a simple script that demonstrates spectrum inversion
24 # using the multiply by [1,-1] method (mixing with Nyquist frequency).
25 # Requires nothing but a sound card, and sounds just like listening
26 # to a SSB signal on the wrong sideband.
29 from gnuradio import gr
30 from gnuradio import audio_portaudio
31 from gnuradio.eng_option import eng_option
32 from optparse import OptionParser
34 class my_top_block(gr.top_block):
37 gr.top_block.__init__(self)
39 parser = OptionParser(option_class=eng_option)
40 parser.add_option("-I", "--audio-input", type="string", default="",
41 help="pcm input device name. E.g., hw:0,0 or /dev/dsp")
42 parser.add_option("-O", "--audio-output", type="string", default="",
43 help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
44 parser.add_option("-r", "--sample-rate", type="eng_float", default=8000,
45 help="set sample rate to RATE (8000)")
46 (options, args) = parser.parse_args ()
51 sample_rate = int(options.sample_rate)
52 src = audio_portaudio.source (sample_rate, options.audio_input)
53 dst = audio_portaudio.sink (sample_rate, options.audio_output)
56 vsource = gr.vector_source_f(vec1, True)
57 multiply = gr.multiply_ff()
59 self.connect(src, (multiply, 0))
60 self.connect(vsource, (multiply, 1))
61 self.connect(multiply, dst)
64 if __name__ == '__main__':
67 except KeyboardInterrupt: