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/* -*- c++ -*- */
/*
* Copyright 2004,2011 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_PLL_FREQDET_CF_H
#define INCLUDED_GR_PLL_FREQDET_CF_H
#include <gr_core_api.h>
#include <gr_sync_block.h>
#include <gri_control_loop.h>
class gr_pll_freqdet_cf;
typedef boost::shared_ptr<gr_pll_freqdet_cf> gr_pll_freqdet_cf_sptr;
GR_CORE_API gr_pll_freqdet_cf_sptr gr_make_pll_freqdet_cf (float loop_bw,
float max_freq,
float min_freq);
/*!
* \brief Implements a PLL which locks to the input frequency and outputs
* an estimate of that frequency. Useful for FM Demod.
* \ingroup sync_blk
*
* input: stream of complex; output: stream of floats
*
* This PLL locks onto a [possibly noisy] reference carrier on
* the input and outputs an estimate of that frequency in radians per sample.
* All settings max_freq and min_freq are in terms of radians per sample,
* NOT HERTZ. The loop bandwidth determins the lock range and should be set
* around pi/200 -- 2pi/100.
* \sa gr_pll_refout_cc, gr_pll_carriertracking_cc
*/
class GR_CORE_API gr_pll_freqdet_cf : public gr_sync_block, public gri_control_loop
{
friend GR_CORE_API gr_pll_freqdet_cf_sptr gr_make_pll_freqdet_cf (float loop_bw,
float max_freq,
float min_freq);
float mod_2pi (float in);
gr_pll_freqdet_cf (float loop_bw, float max_freq, float min_freq);
int work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
private:
float phase_detector(gr_complex sample,float ref_phase);
};
#endif
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