3 * Copyright 2005,2006 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
22 #ifndef INCLUDED_GR_PROBE_AVG_MAG_SQRD_C_H
23 #define INCLUDED_GR_PROBE_AVG_MAG_SQRD_C_H
25 #include <gr_sync_block.h>
26 #include <gr_single_pole_iir.h>
28 class gr_probe_avg_mag_sqrd_c;
29 typedef boost::shared_ptr<gr_probe_avg_mag_sqrd_c> gr_probe_avg_mag_sqrd_c_sptr;
31 gr_probe_avg_mag_sqrd_c_sptr
32 gr_make_probe_avg_mag_sqrd_c (double threshold_db, double alpha = 0.0001);
35 * \brief compute avg magnitude squared.
40 * Compute a running average of the magnitude squared of the the input.
41 * The level and indication as to whether the level exceeds threshold
42 * can be retrieved with the level and unmuted accessors.
44 class gr_probe_avg_mag_sqrd_c : public gr_sync_block
47 gr_single_pole_iir<double,double,double> d_iir;
51 friend gr_probe_avg_mag_sqrd_c_sptr
52 gr_make_probe_avg_mag_sqrd_c (double threshold_db, double alpha);
54 gr_probe_avg_mag_sqrd_c (double threshold_db, double alpha);
57 ~gr_probe_avg_mag_sqrd_c ();
59 int work (int noutput_items,
60 gr_vector_const_void_star &input_items,
61 gr_vector_void_star &output_items);
64 bool unmuted () const { return d_unmuted; }
65 double level () const { return d_level; }
67 double threshold() const;
70 void set_alpha (double alpha);
71 void set_threshold (double decibels);
74 #endif /* INCLUDED_GR_PROBE_AVG_MAG_SQRD_C_H */