1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
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.alaw_encode_sb()
dec = vocoder.alaw_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()
|
