From 36c0ba64703776f4cc2a77adc00740b05e0b055d Mon Sep 17 00:00:00 2001
From: trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Sat, 7 Apr 2007 01:31:18 +0000
Subject: merged developer branch trondeau/cvsd -r4801:4904 to add CVSD vocoder
and example code
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4906 221aa14e-8319-0410-a670-987f0aec2ac5
---
gr-cvsd-vocoder/src/python/encdec.py | 67 ++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
create mode 100755 gr-cvsd-vocoder/src/python/encdec.py
(limited to 'gr-cvsd-vocoder/src/python/encdec.py')
diff --git a/gr-cvsd-vocoder/src/python/encdec.py b/gr-cvsd-vocoder/src/python/encdec.py
new file mode 100755
index 0000000000..b0afe5eb37
--- /dev/null
+++ b/gr-cvsd-vocoder/src/python/encdec.py
@@ -0,0 +1,67 @@
+#!/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, blks
+from gnuradio import audio
+from gnuradio.vocoder import cvsd_vocoder
+
+def build_graph():
+ sample_rate = 8000
+ scale_factor = 32000
+
+ fg = gr.flow_graph()
+ src = audio.source(sample_rate, "plughw:0,0")
+ src_scale = gr.multiply_const_ff(scale_factor)
+
+ interp = blks.rational_resampler_fff(fg, 8, 1)
+ f2s = gr.float_to_short ()
+
+ enc = cvsd_vocoder.encode_sb()
+ dec = cvsd_vocoder.decode_bs()
+
+ s2f = gr.short_to_float ()
+ decim = blks.rational_resampler_fff(fg, 1, 8)
+
+ sink_scale = gr.multiply_const_ff(1.0/scale_factor)
+ sink = audio.sink(sample_rate, "plughw:0,0")
+
+ fg.connect(src, src_scale, interp, f2s, enc)
+ fg.connect(enc, dec, s2f, decim, sink_scale, sink)
+
+ if 0: # debug
+ fg.connect(src, gr.file_sink(gr.sizeof_float, "source.dat"))
+ fg.connect(src_scale, gr.file_sink(gr.sizeof_float, "src_scale.dat"))
+ fg.connect(interp, gr.file_sink(gr.sizeof_float, "interp.dat"))
+ fg.connect(f2s, gr.file_sink(gr.sizeof_short, "f2s.dat"))
+ fg.connect(enc, gr.file_sink(gr.sizeof_char, "enc.dat"))
+ fg.connect(dec, gr.file_sink(gr.sizeof_short, "dec.dat"))
+ fg.connect(s2f, gr.file_sink(gr.sizeof_float, "s2f.dat"))
+ fg.connect(decim, gr.file_sink(gr.sizeof_float, "decim.dat"))
+ fg.connect(sink_scale, gr.file_sink(gr.sizeof_float, "sink_scale.dat"))
+
+ return fg
+
+if __name__ == '__main__':
+ fg = build_graph()
+ fg.start()
+ raw_input ('Press Enter to exit: ')
+ fg.stop()
--
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