GNU Radio 3.6.3.1 C++ API
gr_pll_freqdet_cf.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2004,2011 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
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7  * GNU Radio is free software; you can redistribute it and/or modify
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22 
23 #ifndef INCLUDED_GR_PLL_FREQDET_CF_H
24 #define INCLUDED_GR_PLL_FREQDET_CF_H
25 
26 #include <gr_core_api.h>
27 #include <gr_sync_block.h>
28 #include <gri_control_loop.h>
29 
30 class gr_pll_freqdet_cf;
32 
34  float max_freq,
35  float min_freq);
36 /*!
37  * \brief Implements a PLL which locks to the input frequency and outputs
38  * an estimate of that frequency. Useful for FM Demod.
39  * \ingroup sync_blk
40  *
41  * input: stream of complex; output: stream of floats
42  *
43  * This PLL locks onto a [possibly noisy] reference carrier on
44  * the input and outputs an estimate of that frequency in radians per sample.
45  * All settings max_freq and min_freq are in terms of radians per sample,
46  * NOT HERTZ. The loop bandwidth determins the lock range and should be set
47  * around pi/200 -- 2pi/100.
48  * \sa gr_pll_refout_cc, gr_pll_carriertracking_cc
49  */
50 
52 {
54  float max_freq,
55  float min_freq);
56 
57  float mod_2pi (float in);
58  gr_pll_freqdet_cf (float loop_bw, float max_freq, float min_freq);
59 
60  int work (int noutput_items,
61  gr_vector_const_void_star &input_items,
62  gr_vector_void_star &output_items);
63 private:
64  float phase_detector(gr_complex sample,float ref_phase);
65 };
66 
67 #endif