merged developer branch trondeau/cvsd -r4801:4904 to add CVSD vocoder and example...

[debian/gnuradio] / gr-cvsd-vocoder / src / python / cvsd.py

diff --git a/gr-cvsd-vocoder/src/python/cvsd.py b/gr-cvsd-vocoder/src/python/cvsd.py
new file mode 100644 (file)
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+++ b/gr-cvsd-vocoder/src/python/cvsd.py
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+#!/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.vocoder import cvsd_vocoder
+
+class cvsd_encode(gr.hier_block):
+    def __init__(self, fg, resample=8):
+        scale_factor = 32000.0
+        self.interp = resample
+
+        src_scale = gr.multiply_const_ff(scale_factor)
+        interp = gr.interp_fir_filter_fff(self.interp, self.interp*(1,))
+        f2s = gr.float_to_short()
+        enc = cvsd_vocoder.encode_sb()
+
+        fg.connect(src_scale, interp, f2s, enc)
+        gr.hier_block.__init__(self, fg, src_scale, enc)
+
+
+class cvsd_decode(gr.hier_block):
+    def __init__(self, fg, resample=8):
+        scale_factor = 32000.0
+        self.decim = resample
+
+        dec = cvsd_vocoder.decode_bs()
+        s2f = gr.short_to_float()
+        decim = gr.fir_filter_fff(self.decim, (1,))
+        sink_scale = gr.multiply_const_ff(1.0/scale_factor)
+
+        fg.connect(dec, s2f, decim, sink_scale)
+        gr.hier_block.__init__(self, fg, dec, sink_scale)
+