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#!/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.ulaw_encode_sb()
dec = vocoder.ulaw_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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