From ae30f247616b6229fb304e30fecf3f82ae09dbf6 Mon Sep 17 00:00:00 2001 From: Ben Reynwar <ben@reynwar.net> Date: Thu, 7 Mar 2013 23:27:44 -0700 Subject: analog: Enabling uninstalled python imports. --- gr-analog/python/analog/standard_squelch.py | 78 +++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 gr-analog/python/analog/standard_squelch.py (limited to 'gr-analog/python/analog/standard_squelch.py') diff --git a/gr-analog/python/analog/standard_squelch.py b/gr-analog/python/analog/standard_squelch.py new file mode 100644 index 0000000000..3ed9ebceaa --- /dev/null +++ b/gr-analog/python/analog/standard_squelch.py @@ -0,0 +1,78 @@ +# +# Copyright 2005,2007,2012 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. +# + +import math +from gnuradio import gr +from gnuradio import blocks +from gnuradio import filter + +class standard_squelch(gr.hier_block2): + def __init__(self, audio_rate): + gr.hier_block2.__init__(self, "standard_squelch", + gr.io_signature(1, 1, gr.sizeof_float), # Input signature + gr.io_signature(1, 1, gr.sizeof_float)) # Output signature + + self.input_node = blocks.add_const_ff(0) # FIXME kludge + + self.low_iir = filter.iir_filter_ffd((0.0193,0,-0.0193),(1,1.9524,-0.9615)) + self.low_square = blocks.multiply_ff() + self.low_smooth = filter.single_pole_iir_filter_ff(1/(0.01*audio_rate)) # 100ms time constant + + self.hi_iir = filter.iir_filter_ffd((0.0193,0,-0.0193),(1,1.3597,-0.9615)) + self.hi_square = blocks.multiply_ff() + self.hi_smooth = filter.single_pole_iir_filter_ff(1/(0.01*audio_rate)) + + self.sub = blocks.sub_ff(); + self.add = blocks.add_ff(); + self.gate = blocks.threshold_ff(0.3,0.43,0) + self.squelch_lpf = filter.single_pole_iir_filter_ff(1/(0.01*audio_rate)) + + self.div = blocks.divide_ff() + self.squelch_mult = blocks.multiply_ff() + + self.connect(self, self.input_node) + self.connect(self.input_node, (self.squelch_mult, 0)) + + self.connect(self.input_node,self.low_iir) + self.connect(self.low_iir,(self.low_square,0)) + self.connect(self.low_iir,(self.low_square,1)) + self.connect(self.low_square,self.low_smooth,(self.sub,0)) + self.connect(self.low_smooth, (self.add,0)) + + self.connect(self.input_node,self.hi_iir) + self.connect(self.hi_iir,(self.hi_square,0)) + self.connect(self.hi_iir,(self.hi_square,1)) + self.connect(self.hi_square,self.hi_smooth,(self.sub,1)) + self.connect(self.hi_smooth, (self.add,1)) + + self.connect(self.sub, (self.div, 0)) + self.connect(self.add, (self.div, 1)) + self.connect(self.div, self.gate, self.squelch_lpf, (self.squelch_mult,1)) + self.connect(self.squelch_mult, self) + + def set_threshold(self, threshold): + self.gate.set_hi(threshold) + + def threshold(self): + return self.gate.hi() + + def squelch_range(self): + return (0.0, 1.0, 1.0/100) -- cgit v1.2.3