From b459380b7143f7e048d1d7ca3e6c8a04d563b9f3 Mon Sep 17 00:00:00 2001
From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Fri, 23 Feb 2007 19:10:22 +0000
Subject: Added noise example using LFSR.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4615 221aa14e-8319-0410-a670-987f0aec2ac5
---
gnuradio-examples/python/audio/noise.py | 55 +++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
create mode 100755 gnuradio-examples/python/audio/noise.py
(limited to 'gnuradio-examples/python/audio/noise.py')
diff --git a/gnuradio-examples/python/audio/noise.py b/gnuradio-examples/python/audio/noise.py
new file mode 100755
index 0000000000..73694f31f9
--- /dev/null
+++ b/gnuradio-examples/python/audio/noise.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+#
+# Copyright 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 2, 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.
+#
+
+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("-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=48000,
+ help="set sample rate to RATE (48000)")
+ (options, args) = parser.parse_args ()
+ if len(args) != 0:
+ parser.print_help()
+ raise SystemExit, 1
+
+ sample_rate = int(options.sample_rate)
+ ampl = 0.1
+
+ src = gr.glfsr_source_b(32) # Pseudorandom noise source
+ b2f = gr.chunks_to_symbols_bf([ampl, -ampl], 1)
+ dst = audio.sink(sample_rate, options.audio_output)
+ self.connect(src, b2f, dst)
+
+if __name__ == '__main__':
+ try:
+ my_graph().run()
+ except KeyboardInterrupt:
+ pass
--
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