1 files changed, 68 insertions, 0 deletions
diff --git a/gr-vocoder/examples/cvsd_audio_loopback.py b/gr-vocoder/examples/cvsd_audio_loopback.py
new file mode 100755
index 000000000..7f2a00dbf
--- /dev/null
+++ b/gr-vocoder/examples/cvsd_audio_loopback.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+#
+# Copyright 2007,2011 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, blks2
+from gnuradio import audio
+from gnuradio import vocoder
+
+def build_graph():
+    sample_rate = 8000
+    scale_factor = 32000
+    
+    tb = gr.top_block()
+    src = audio.source(sample_rate, "plughw:0,0")
+    src_scale = gr.multiply_const_ff(scale_factor)
+
+    interp = blks2.rational_resampler_fff(8, 1)
+    f2s = gr.float_to_short ()
+
+    enc = vocoder.cvsd_encode_sb()
+    dec = vocoder.cvsd_decode_bs()
+
+    s2f = gr.short_to_float ()
+    decim = blks2.rational_resampler_fff(1, 8)
+
+    sink_scale = gr.multiply_const_ff(1.0/scale_factor)
+    sink = audio.sink(sample_rate, "plughw:0,0")
+
+    tb.connect(src, src_scale, interp, f2s, enc)
+    tb.connect(enc, dec, s2f, decim, sink_scale, sink)
+
+    if 0: # debug
+        tb.conect(src, gr.file_sink(gr.sizeof_float, "source.dat"))
+        tb.conect(src_scale, gr.file_sink(gr.sizeof_float, "src_scale.dat"))
+        tb.conect(interp, gr.file_sink(gr.sizeof_float, "interp.dat"))
+        tb.conect(f2s, gr.file_sink(gr.sizeof_short, "f2s.dat"))
+        tb.conect(enc, gr.file_sink(gr.sizeof_char,  "enc.dat"))
+        tb.conect(dec, gr.file_sink(gr.sizeof_short, "dec.dat"))
+        tb.conect(s2f, gr.file_sink(gr.sizeof_float, "s2f.dat"))
+        tb.conect(decim, gr.file_sink(gr.sizeof_float, "decim.dat"))
+        tb.conect(sink_scale, gr.file_sink(gr.sizeof_float, "sink_scale.dat"))
+        
+    return tb
+
+if __name__ == '__main__':
+    tb = build_graph()
+    tb.start()
+    raw_input ('Press Enter to exit: ')
+    tb.stop()
+    tb.wait()