GNU Radio 3.6.5 C++ API

gr_simple_squelch_cc.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2005 Free Software Foundation, Inc.
00004  *
00005  * This file is part of GNU Radio
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  *
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 #ifndef INCLUDED_GR_SIMPLE_SQUELCH_CC_H
00023 #define INCLUDED_GR_SIMPLE_SQUELCH_CC_H
00024 
00025 #include <gr_core_api.h>
00026 #include <gr_sync_block.h>
00027 #include <gr_single_pole_iir.h>
00028 
00029 class gr_simple_squelch_cc;
00030 typedef boost::shared_ptr<gr_simple_squelch_cc> gr_simple_squelch_cc_sptr;
00031 
00032 GR_CORE_API gr_simple_squelch_cc_sptr
00033 gr_make_simple_squelch_cc (double threshold_db, double alpha = 0.0001);
00034 
00035 /*!
00036  * \brief simple squelch block based on average signal power and threshold in dB.
00037  */
00038 class GR_CORE_API gr_simple_squelch_cc : public gr_sync_block
00039 {
00040   double                                        d_threshold;
00041   gr_single_pole_iir<double,double,double>      d_iir;
00042   bool                                          d_unmuted;
00043 
00044   friend GR_CORE_API gr_simple_squelch_cc_sptr
00045   gr_make_simple_squelch_cc (double threshold_db, double alpha);
00046 
00047   gr_simple_squelch_cc (double threshold_db, double alpha);
00048 
00049 public:
00050   ~gr_simple_squelch_cc ();
00051 
00052   int work (int noutput_items,
00053             gr_vector_const_void_star &input_items,
00054             gr_vector_void_star &output_items);
00055 
00056   bool unmuted () const { return d_unmuted; }
00057 
00058   void set_alpha (double alpha);
00059   void set_threshold (double decibels);
00060 
00061   double threshold() const;
00062   std::vector<float> squelch_range() const;
00063 
00064 };
00065 
00066 #endif /* INCLUDED_GR_SIMPLE_SQUELCH_CC_H */