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* Copyright 2004,2011 Free Software Foundation, Inc.
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* This file is part of GNU Radio
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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#ifndef INCLUDED_DIGITAL_CLOCK_RECOVERY_MM_FF_H
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#define INCLUDED_DIGITAL_CLOCK_RECOVERY_MM_FF_H
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#include <digital_api.h>
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class gri_mmse_fir_interpolator;
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class digital_clock_recovery_mm_ff;
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typedef boost::shared_ptr<digital_clock_recovery_mm_ff> digital_clock_recovery_mm_ff_sptr;
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DIGITAL_API digital_clock_recovery_mm_ff_sptr
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digital_make_clock_recovery_mm_ff (float omega, float gain_omega,
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float mu, float gain_mu,
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float omega_relative_limit=0.001);
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* \brief Mueller and Müller (M&M) based clock recovery block with float input, float output.
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* This implements the Mueller and Müller (M&M) discrete-time error-tracking synchronizer.
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* See "Digital Communication Receivers: Synchronization, Channel
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* Estimation and Signal Processing" by Heinrich Meyr, Marc Moeneclaey, & Stefan Fechtel.
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class DIGITAL_API digital_clock_recovery_mm_ff : public gr_block
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~digital_clock_recovery_mm_ff ();
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void forecast(int noutput_items, gr_vector_int &ninput_items_required);
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int general_work (int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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float mu() const { return d_mu;}
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float omega() const { return d_omega;}
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float gain_mu() const { return d_gain_mu;}
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float gain_omega() const { return d_gain_omega;}
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void set_gain_mu (float gain_mu) { d_gain_mu = gain_mu; }
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void set_gain_omega (float gain_omega) { d_gain_omega = gain_omega; }
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void set_mu (float mu) { d_mu = mu; }
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void set_omega (float omega){
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d_min_omega = omega*(1.0 - d_omega_relative_limit);
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d_max_omega = omega*(1.0 + d_omega_relative_limit);
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d_omega_mid = 0.5*(d_min_omega+d_max_omega);
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digital_clock_recovery_mm_ff (float omega, float gain_omega, float mu, float gain_mu,
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float omega_relative_limit);
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float d_mu; // fractional sample position [0.0, 1.0]
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float d_omega; // nominal frequency
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float d_min_omega; // minimum allowed omega
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float d_omega_mid; // average omega
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float d_max_omega; // maximum allowed omega
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float d_gain_omega; // gain for adjusting omega
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float d_gain_mu; // gain for adjusting mu
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gri_mmse_fir_interpolator *d_interp;
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float d_omega_relative_limit; // used to compute min and max omega
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friend DIGITAL_API digital_clock_recovery_mm_ff_sptr
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digital_make_clock_recovery_mm_ff (float omega, float gain_omega,
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float mu, float gain_mu,
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float omega_relative_limit);