GNU Radio 3.6.5 C++ API

gr_probe_avg_mag_sqrd_c.h

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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_C_H
00023 #define INCLUDED_GR_PROBE_AVG_MAG_SQRD_C_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_probe_avg_mag_sqrd_c;
00030 typedef boost::shared_ptr<gr_probe_avg_mag_sqrd_c> gr_probe_avg_mag_sqrd_c_sptr;
00031 
00032 GR_CORE_API gr_probe_avg_mag_sqrd_c_sptr
00033 gr_make_probe_avg_mag_sqrd_c (double threshold_db, double alpha = 0.0001);
00034 
00035 /*!
00036  * \brief compute avg magnitude squared.
00037  *
00038  * input: gr_complex
00039  *
00040  * Compute a running average of the magnitude squared of the the input.
00041  * The level and indication as to whether the level exceeds threshold
00042  * can be retrieved with the level and unmuted accessors.
00043  */
00044 class GR_CORE_API gr_probe_avg_mag_sqrd_c : public gr_sync_block
00045 {
00046   double                                        d_threshold;
00047   gr_single_pole_iir<double,double,double>      d_iir;
00048   bool                                          d_unmuted;
00049   double                                        d_level;
00050 
00051   friend GR_CORE_API gr_probe_avg_mag_sqrd_c_sptr
00052   gr_make_probe_avg_mag_sqrd_c (double threshold_db, double alpha);
00053 
00054   gr_probe_avg_mag_sqrd_c (double threshold_db, double alpha);
00055 
00056 public:
00057   ~gr_probe_avg_mag_sqrd_c ();
00058 
00059   int work (int noutput_items,
00060             gr_vector_const_void_star &input_items,
00061             gr_vector_void_star &output_items);
00062 
00063   // ACCESSORS
00064   bool unmuted () const { return d_unmuted; }
00065   double level () const { return d_level; }
00066 
00067   double threshold() const;
00068 
00069   // SETTERS
00070   void set_alpha (double alpha);
00071   void set_threshold (double decibels);
00072 };
00073 
00074 #endif /* INCLUDED_GR_PROBE_AVG_MAG_SQRD_C_H */