GNU Radio 3.4.0 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2005,2006 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_PROBE_AVG_MAG_SQRD_CF_H 00023 #define INCLUDED_GR_PROBE_AVG_MAG_SQRD_CF_H 00024 00025 #include <gr_sync_block.h> 00026 #include <gr_single_pole_iir.h> 00027 00028 class gr_probe_avg_mag_sqrd_cf; 00029 typedef boost::shared_ptr<gr_probe_avg_mag_sqrd_cf> gr_probe_avg_mag_sqrd_cf_sptr; 00030 00031 gr_probe_avg_mag_sqrd_cf_sptr 00032 gr_make_probe_avg_mag_sqrd_cf (double threshold_db, double alpha = 0.0001); 00033 00034 /*! 00035 * \brief compute avg magnitude squared. 00036 * \ingroup sink_blk 00037 * 00038 * input: gr_complex 00039 * output: gr_float 00040 * 00041 * Compute a running average of the magnitude squared of the the input. 00042 * The level and indication as to whether the level exceeds threshold 00043 * can be retrieved with the level and unmuted accessors. 00044 * 00045 */ 00046 class gr_probe_avg_mag_sqrd_cf : public gr_sync_block 00047 { 00048 double d_threshold; 00049 gr_single_pole_iir<double,double,double> d_iir; 00050 bool d_unmuted; 00051 double d_level; 00052 00053 friend gr_probe_avg_mag_sqrd_cf_sptr 00054 gr_make_probe_avg_mag_sqrd_cf (double threshold_db, double alpha); 00055 00056 gr_probe_avg_mag_sqrd_cf (double threshold_db, double alpha); 00057 00058 public: 00059 ~gr_probe_avg_mag_sqrd_cf (); 00060 00061 int work (int noutput_items, 00062 gr_vector_const_void_star &input_items, 00063 gr_vector_void_star &output_items); 00064 00065 // ACCESSORS 00066 bool unmuted () const { return d_unmuted; } 00067 double level () const { return d_level; } 00068 00069 double threshold() const; 00070 00071 // SETTERS 00072 void set_alpha (double alpha); 00073 void set_threshold (double decibels); 00074 }; 00075 00076 #endif /* INCLUDED_GR_PROBE_AVG_MAG_SQRD_CF_H */