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#!/usr/bin/env python
#
# Copyright 2004,2005,2007 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.
#
# Gang - Here's a simple script that demonstrates spectrum inversion
# using the multiply by [1,-1] method (mixing with Nyquist frequency).
# Requires nothing but a sound card, and sounds just like listening
# to a SSB signal on the wrong sideband.
#
from gnuradio import gr
from gnuradio import audio
from gnuradio.eng_option import eng_option
from optparse import OptionParser
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
parser = OptionParser(option_class=eng_option)
parser.add_option("-I", "--audio-input", type="string", default="",
help="pcm input device name. E.g., hw:0,0 or /dev/dsp")
parser.add_option("-O", "--audio-output", type="string", default="",
help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
parser.add_option("-r", "--sample-rate", type="eng_float", default=8000,
help="set sample rate to RATE (8000)")
(options, args) = parser.parse_args ()
if len(args) != 0:
parser.print_help()
raise SystemExit, 1
sample_rate = int(options.sample_rate)
src = audio.source (sample_rate, options.audio_input)
dst = audio.sink (sample_rate, options.audio_output)
vec1 = [1, -1]
vsource = gr.vector_source_f(vec1, True)
multiply = gr.multiply_ff()
self.connect(src, (multiply, 0))
self.connect(vsource, (multiply, 1))
self.connect(multiply, dst)
if __name__ == '__main__':
try:
my_top_block().run()
except KeyboardInterrupt:
pass
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