From 5d69a524f81f234b3fbc41d49ba18d6f6886baba Mon Sep 17 00:00:00 2001
From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Thu, 3 Aug 2006 04:51:51 +0000
Subject: Houston, we have a trunk.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5
---
.../python/audio/spectrum_inversion.py | 48 ++++++++++++++++++++++
1 file changed, 48 insertions(+)
create mode 100755 gnuradio-examples/python/audio/spectrum_inversion.py
(limited to 'gnuradio-examples/python/audio/spectrum_inversion.py')
diff --git a/gnuradio-examples/python/audio/spectrum_inversion.py b/gnuradio-examples/python/audio/spectrum_inversion.py
new file mode 100755
index 0000000000..9bb87aa4b1
--- /dev/null
+++ b/gnuradio-examples/python/audio/spectrum_inversion.py
@@ -0,0 +1,48 @@
+#!/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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