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#!/usr/bin/env python
#
# 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_graph(gr.flow_graph):
def __init__(self):
gr.flow_graph.__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_graph().run()
except KeyboardInterrupt:
pass
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