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# Copyright 2004,2005,2007 Free Software Foundation, Inc.
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# This file is part of GNU Radio
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# GNU Radio is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# GNU Radio is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with GNU Radio; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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# Gang - Here's a simple script that demonstrates spectrum inversion
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# using the multiply by [1,-1] method (mixing with Nyquist frequency).
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# Requires nothing but a sound card, and sounds just like listening
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# to a SSB signal on the wrong sideband.
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from gnuradio import gr
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from gnuradio import audio
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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class my_top_block(gr.top_block):
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gr.top_block.__init__(self)
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parser = OptionParser(option_class=eng_option)
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parser.add_option("-I", "--audio-input", type="string", default="",
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help="pcm input device name. E.g., hw:0,0 or /dev/dsp")
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parser.add_option("-O", "--audio-output", type="string", default="",
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help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
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parser.add_option("-r", "--sample-rate", type="eng_float", default=8000,
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help="set sample rate to RATE (8000)")
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(options, args) = parser.parse_args ()
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sample_rate = int(options.sample_rate)
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src = audio.source (sample_rate, options.audio_input)
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dst = audio.sink (sample_rate, options.audio_output)
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vsource = gr.vector_source_f(vec1, True)
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multiply = gr.multiply_ff()
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self.connect(src, (multiply, 0))
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self.connect(vsource, (multiply, 1))
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self.connect(multiply, dst)
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if __name__ == '__main__':
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except KeyboardInterrupt: