From b7d8980a6e9e070609b4270ad51d8a91ebfb60b2 Mon Sep 17 00:00:00 2001
From: Johnathan Corgan <jcorgan@corganenterprises.com>
Date: Mon, 4 Jul 2011 21:00:18 -0700
Subject: gnuradio-examples, gr-audio: moved audio Python and C++ examples into
gr-audio
This begins a transition of examples from a separate gnuradio-examples component
into an examples directory with the component they go with. In this commit:
gnuradio-examples/c++/audio/ => gr-audio/examples/c++
gnuradio-examples/python/audio => gr-audio/examples/python
The system installation directory remains $PREFIX/share/gnuradio/examples/audio
---
gr-audio/examples/python/spectrum_inversion.py | 68 ++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100755 gr-audio/examples/python/spectrum_inversion.py
(limited to 'gr-audio/examples/python/spectrum_inversion.py')
diff --git a/gr-audio/examples/python/spectrum_inversion.py b/gr-audio/examples/python/spectrum_inversion.py
new file mode 100755
index 0000000000..021e23f2d7
--- /dev/null
+++ b/gr-audio/examples/python/spectrum_inversion.py
@@ -0,0 +1,68 @@
+#!/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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