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diff --git a/gnuradio-examples/python/hier/digital/tx_voice.py b/gnuradio-examples/python/hier/digital/tx_voice.py
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+#!/usr/bin/env python
+#
+# Copyright 2005,2006 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, gru, modulation_utils
+from gnuradio import usrp
+from gnuradio import audio
+from gnuradio import eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+from gnuradio.vocoder import gsm_full_rate
+
+import random
+import time
+import struct
+import sys
+
+# from current dir
+from transmit_path import transmit_path
+import fusb_options
+
+#import os
+#print os.getpid()
+#raw_input('Attach and press enter')
+
+
+class audio_rx(gr.hier_block):
+ def __init__(self, fg, audio_input_dev):
+ sample_rate = 8000
+ src = audio.source(sample_rate, audio_input_dev)
+ src_scale = gr.multiply_const_ff(32767)
+ f2s = gr.float_to_short()
+ voice_coder = gsm_full_rate.encode_sp()
+ self.packets_from_encoder = gr.msg_queue()
+ packet_sink = gr.message_sink(33, self.packets_from_encoder, False)
+ fg.connect(src, src_scale, f2s, voice_coder, packet_sink)
+ gr.hier_block.__init__(self, fg, src, packet_sink)
+
+ def get_encoded_voice_packet(self):
+ return self.packets_from_encoder.delete_head()
+
+
+class my_graph(gr.flow_graph):
+
+ def __init__(self, modulator_class, options):
+ gr.flow_graph.__init__(self)
+ self.txpath = transmit_path(self, modulator_class, options)
+ self.audio_rx = audio_rx(self, options.audio_input)
+
+
+
+# /////////////////////////////////////////////////////////////////////////////
+# main
+# /////////////////////////////////////////////////////////////////////////////
+
+def main():
+
+ def send_pkt(payload='', eof=False):
+ return fg.txpath.send_pkt(payload, eof)
+
+ def rx_callback(ok, payload):
+ print "ok = %r, payload = '%s'" % (ok, payload)
+
+ mods = modulation_utils.type_1_mods()
+
+ parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
+ expert_grp = parser.add_option_group("Expert")
+
+ parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(),
+ default='gmsk',
+ help="Select modulation from: %s [default=%%default]"
+ % (', '.join(mods.keys()),))
+ parser.add_option("-M", "--megabytes", type="eng_float", default=0,
+ help="set megabytes to transmit [default=inf]")
+ parser.add_option("-I", "--audio-input", type="string", default="",
+ help="pcm input device name. E.g., hw:0,0 or /dev/dsp")
+
+ transmit_path.add_options(parser, expert_grp)
+
+ for mod in mods.values():
+ mod.add_options(expert_grp)
+
+ fusb_options.add_options(expert_grp)
+
+ parser.set_defaults(bitrate=50e3) # override default bitrate default
+ (options, args) = parser.parse_args ()
+
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ if options.tx_freq is None:
+ sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
+ parser.print_help(sys.stderr)
+ sys.exit(1)
+
+
+ # build the graph
+ fg = my_graph(mods[options.modulation], options)
+
+ r = gr.enable_realtime_scheduling()
+ if r != gr.RT_OK:
+ print "Warning: failed to enable realtime scheduling"
+
+
+ fg.start() # start flow graph
+
+ # generate and send packets
+ nbytes = int(1e6 * options.megabytes)
+ n = 0
+ pktno = 0
+
+ while nbytes == 0 or n < nbytes:
+ packet = fg.audio_rx.get_encoded_voice_packet()
+ s = packet.to_string()
+ send_pkt(s)
+ n += len(s)
+ sys.stderr.write('.')
+ pktno += 1
+
+ send_pkt(eof=True)
+ fg.wait() # wait for it to finish
+ fg.txpath.set_auto_tr(False)
+
+
+if __name__ == '__main__':
+ try:
+ main()
+ except KeyboardInterrupt:
+ pass