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Diffstat (limited to 'gnuradio-examples/python/audio/dial_squelch.py')
| -rwxr-xr-x | gnuradio-examples/python/audio/dial_squelch.py | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/gnuradio-examples/python/audio/dial_squelch.py b/gnuradio-examples/python/audio/dial_squelch.py deleted file mode 100755 index 8a0c3f5626..0000000000 --- a/gnuradio-examples/python/audio/dial_squelch.py +++ /dev/null @@ -1,89 +0,0 @@ -#!/usr/bin/env python - -# Copyright 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 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, audio, eng_option -from gnuradio.eng_option import eng_option -from math import pi, cos -from optparse import OptionParser - -""" -This script generates a standard dial tone and then applies a sinusoidal -envelope to vary it's loudness. The audio is then passed through the -power squelch block before it gets sent to the sound card. By varying -the command line parameters, one can see the effect of differing -amounts of power averaging, threshold, and attack/decay ramping. -""" - -class app_flow_graph(gr.flow_graph): - def __init__(self, options, args): - gr.flow_graph.__init__(self) - - # Create dial tone by adding two sine waves - SRC1 = gr.sig_source_f(options.rate, gr.GR_SIN_WAVE, 350, 0.5, 0.0) - SRC2 = gr.sig_source_f(options.rate, gr.GR_SIN_WAVE, 440, 0.5, 0.0) - ADD = gr.add_ff() - - # Convert to vector stream (and back) to apply raised cosine envelope - # You could also do this with a vector_source_f block that repeats. - S2V = gr.stream_to_vector(gr.sizeof_float, options.rate) - ENV = [0.5-cos(2*pi*x/options.rate)/2 for x in range(options.rate)] - MLT = gr.multiply_const_vff(ENV) - V2S = gr.vector_to_stream(gr.sizeof_float, options.rate) - - # Run through power squelch with user supplied or default options - # Zero output when squelch is invoked - SQL = gr.pwr_squelch_ff(options.threshold, options.alpha, options.ramp, False) - DST = audio.sink(options.rate) - - # Solder it all together - self.connect(SRC1, (ADD, 0)) - self.connect(SRC2, (ADD, 1)) - self.connect(ADD, S2V, MLT, V2S, SQL, DST) - -def main(): - parser = OptionParser(option_class=eng_option) - parser.add_option("-r", "--rate", type="int", default=8000, help="set audio output sample rate to RATE", metavar="RATE") - parser.add_option("-t", "--threshold", type="eng_float", default=-10.0, help="set power squelch to DB", metavar="DB") - parser.add_option("-a", "--alpha", type="eng_float", default=None, help="set alpha to ALPHA", metavar="ALPHA") - parser.add_option("-m", "--ramp", type="int", default=None, help="set attack/decay ramp to SAMPLES", metavar="SAMPLES") - (options, args) = parser.parse_args() - - if options.alpha == None: - options.alpha = 50.0/options.rate - - if options.ramp == None: - options.ramp = options.rate/50 # ~ 20 ms - - print "Using audio rate of", options.rate - print "Using threshold of", options.threshold, "db" - print "Using alpha of", options.alpha - print "Using ramp of", options.ramp, "samples" - - fg = app_flow_graph(options, args) - - try: - fg.run() - except KeyboardInterrupt: - pass - -if __name__ == "__main__": - main() |