GNU Radio 3.7.1 C++ API
|
00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2004,2013 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_THRESHOLD_FF_H 00024 #define INCLUDED_GR_THRESHOLD_FF_H 00025 00026 #include <gnuradio/blocks/api.h> 00027 #include <gnuradio/sync_block.h> 00028 00029 namespace gr { 00030 namespace blocks { 00031 00032 /*! 00033 * \brief Output a 1 or zero based on a threshold value. 00034 * \ingroup level_controllers_blk 00035 * 00036 * \details 00037 * Test the incoming signal against a threshold. If the signal 00038 * excedes the \p hi value, it will output a 1 until the signal 00039 * falls below the \p lo value. 00040 */ 00041 class BLOCKS_API threshold_ff : virtual public sync_block 00042 { 00043 public: 00044 // gr::blocks::threshold_ff::sptr 00045 typedef boost::shared_ptr<threshold_ff> sptr; 00046 00047 /* \brief Create a threadshold block. 00048 * \param lo Threshold input signal needs to drop below to 00049 * change state to 0. 00050 * \param hi Threshold input signal needs to rise above to 00051 * change state to 1. 00052 * \param initial_state Initial state of the block (0 or 1). 00053 */ 00054 static sptr make(float lo, float hi, float initial_state=0); 00055 00056 virtual float lo () const = 0; 00057 virtual void set_lo (float lo) = 0; 00058 virtual float hi () const = 0; 00059 virtual void set_hi (float hi) = 0; 00060 virtual float last_state () const = 0; 00061 virtual void set_last_state (float last_state) = 0; 00062 }; 00063 00064 } /* namespace blocks */ 00065 } /* namespace gr */ 00066 00067 #endif /* INCLUDED_GR_THRESHOLD_FF_H */