GNU Radio 3.5.3.2 C++ API
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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 * \ingroup level_blk 00038 */ 00039 class GR_CORE_API gr_simple_squelch_cc : public gr_sync_block 00040 { 00041 double d_threshold; 00042 gr_single_pole_iir<double,double,double> d_iir; 00043 bool d_unmuted; 00044 00045 friend GR_CORE_API gr_simple_squelch_cc_sptr 00046 gr_make_simple_squelch_cc (double threshold_db, double alpha); 00047 00048 gr_simple_squelch_cc (double threshold_db, double alpha); 00049 00050 public: 00051 ~gr_simple_squelch_cc (); 00052 00053 int work (int noutput_items, 00054 gr_vector_const_void_star &input_items, 00055 gr_vector_void_star &output_items); 00056 00057 bool unmuted () const { return d_unmuted; } 00058 00059 void set_alpha (double alpha); 00060 void set_threshold (double decibels); 00061 00062 double threshold() const; 00063 std::vector<float> squelch_range() const; 00064 00065 }; 00066 00067 #endif /* INCLUDED_GR_SIMPLE_SQUELCH_CC_H */