GNU Radio Manual and C++ API Reference  3.7.9.2
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threshold_ff.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2004,2013 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
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22 
23 #ifndef INCLUDED_GR_THRESHOLD_FF_H
24 #define INCLUDED_GR_THRESHOLD_FF_H
25 
26 #include <gnuradio/blocks/api.h>
27 #include <gnuradio/sync_block.h>
28 
29 namespace gr {
30  namespace blocks {
31 
32  /*!
33  * \brief Output a 1 or zero based on a threshold value.
34  * \ingroup level_controllers_blk
35  *
36  * \details
37  * Test the incoming signal against a threshold. If the signal
38  * excedes the \p hi value, it will output a 1 until the signal
39  * falls below the \p lo value.
40  */
41  class BLOCKS_API threshold_ff : virtual public sync_block
42  {
43  public:
44  // gr::blocks::threshold_ff::sptr
45  typedef boost::shared_ptr<threshold_ff> sptr;
46 
47  /* \brief Create a threadshold block.
48  * \param lo Threshold input signal needs to drop below to
49  * change state to 0.
50  * \param hi Threshold input signal needs to rise above to
51  * change state to 1.
52  * \param initial_state Initial state of the block (0 or 1).
53  */
54  static sptr make(float lo, float hi, float initial_state=0);
55 
56  virtual float lo () const = 0;
57  virtual void set_lo (float lo) = 0;
58  virtual float hi () const = 0;
59  virtual void set_hi (float hi) = 0;
60  virtual float last_state () const = 0;
61  virtual void set_last_state (float last_state) = 0;
62  };
63 
64  } /* namespace blocks */
65 } /* namespace gr */
66 
67 #endif /* INCLUDED_GR_THRESHOLD_FF_H */
Output a 1 or zero based on a threshold value.
Definition: threshold_ff.h:41
Include this header to use the message passing features.
Definition: logger.h:131
#define BLOCKS_API
Definition: gr-blocks/include/gnuradio/blocks/api.h:30
synchronous 1:1 input to output with historyOverride work to provide the signal processing implementa...
Definition: sync_block.h:37
boost::shared_ptr< threshold_ff > sptr
Definition: threshold_ff.h:45