GNU Radio 3.6.4.2 C++ API
peak_detector2_fb.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2007,2013 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 
00023 #ifndef INCLUDED_GR_PEAK_DETECTOR2_FB_H
00024 #define INCLUDED_GR_PEAK_DETECTOR2_FB_H
00025 
00026 #include <blocks/api.h>
00027 #include <gr_sync_block.h>
00028 
00029 namespace gr {
00030   namespace blocks {
00031 
00032     /*!
00033      * \brief Detect the peak of a signal
00034      * \ingroup level_blk
00035      *
00036      * If a peak is detected, this block outputs a 1, or it outputs
00037      * 0's. A separate debug output may be connected, to view the
00038      * internal EWMA described below.
00039      *
00040      * \param threshold_factor_rise The threshold factor determins
00041      *        when a peak is present. An EWMA average of the signal is
00042      *        calculated and when the value of the signal goes over
00043      *        threshold_factor_rise*average, we call the peak.
00044      * \param look_ahead The look-ahead value is used when the
00045      *        threshold is found to locate the peak within this range.
00046      * \param alpha The gain value of a single-pole moving average filter.
00047      */
00048     class BLOCKS_API peak_detector2_fb : virtual public gr_sync_block
00049     {
00050     public:
00051       // gr::blocks::peak_detector2_fb::sptr
00052       typedef boost::shared_ptr<peak_detector2_fb> sptr;
00053 
00054       static sptr make(float threshold_factor_rise=7,
00055                        int look_ahead=1000, float alpha=0.001);
00056 
00057       /*! \brief Set the threshold factor value for the rise time
00058        *  \param thr new threshold factor
00059        */
00060       virtual void set_threshold_factor_rise(float thr) = 0;
00061 
00062       /*! \brief Set the look-ahead factor
00063        *  \param look new look-ahead factor
00064        */
00065       virtual void set_look_ahead(int look) = 0;
00066 
00067       /*! \brief Set the running average alpha
00068        *  \param alpha new alpha for running average
00069        */
00070       virtual void set_alpha(int alpha) = 0;
00071 
00072       /*! \brief Get the threshold factor value for the rise time
00073        *  \return threshold factor
00074        */
00075       virtual float threshold_factor_rise() = 0;
00076 
00077       /*! \brief Get the look-ahead factor value
00078        *  \return look-ahead factor
00079        */
00080       virtual int look_ahead() = 0;
00081 
00082       /*! \brief Get the alpha value of the running average
00083        *  \return alpha
00084        */
00085       virtual float alpha() = 0;
00086     };
00087 
00088   } /* namespace blocks */
00089 } /* namespace gr */
00090 
00091 #endif /* INCLUDED_GR_PEAK_DETECTOR2_FB_H */