From 7d4199a45036bbc10d749437cd8730434b51aec6 Mon Sep 17 00:00:00 2001
From: Johnathan Corgan <jcorgan@corganenterprises.com>
Date: Fri, 22 Jul 2011 15:11:24 -0700
Subject: gr-vocoder: added G.721 32K ADPCM encoder, decoder, and audio
loopback example
---
gr-vocoder/examples/g721_audio_loopback.py | 45 ++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
create mode 100755 gr-vocoder/examples/g721_audio_loopback.py
(limited to 'gr-vocoder/examples/g721_audio_loopback.py')
diff --git a/gr-vocoder/examples/g721_audio_loopback.py b/gr-vocoder/examples/g721_audio_loopback.py
new file mode 100755
index 0000000000..8b5bc8f33f
--- /dev/null
+++ b/gr-vocoder/examples/g721_audio_loopback.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+#
+# Copyright 2011 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.
+#
+
+from gnuradio import gr
+from gnuradio import audio
+from gnuradio import vocoder
+
+def build_graph():
+ tb = gr.top_block()
+ src = audio.source(8000)
+ src_scale = gr.multiply_const_ff(32767)
+ f2s = gr.float_to_short ()
+ enc = vocoder.g721_encode_sb()
+ dec = vocoder.g721_decode_bs()
+ s2f = gr.short_to_float ()
+ sink_scale = gr.multiply_const_ff(1.0/32767.)
+ sink = audio.sink(8000)
+ tb.connect(src, src_scale, f2s, enc, dec, s2f, sink_scale, sink)
+ return tb
+
+if __name__ == '__main__':
+ tb = build_graph()
+ tb.start()
+ raw_input ('Press Enter to exit: ')
+ tb.stop()
+ tb.wait()
--
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