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/* -*- c++ -*- */
/*
* Copyright 2002 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 2, 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 _GRATSCBITTIMINGLOOP2_H_
#define _GRATSCBITTIMINGLOOP2_H_
#include <gr_nco.h>
#include <VrSigProc.h>
#include <VrHistoryProc.h>
#include <VrDecimatingSigProc.h>
#include <interleaver_fifo.h>
#include <gr_single_pole_iir.h>
#include <gr_mmse_fir_interpolator.h>
/*!
* \brief ATSC BitTimingLoop
*
* This class accepts a single real input and produces a single real output
*/
class GrAtscBitTimingLoop2 : public VrDecimatingSigProc<float,float> {
public:
GrAtscBitTimingLoop2 ();
virtual ~GrAtscBitTimingLoop2 () { };
virtual const char *name () { return "GrAtscBitTimingLoop2"; }
virtual int forecast (VrSampleRange output,
VrSampleRange inputs[]);
virtual int work (VrSampleRange output, void *o[],
VrSampleRange inputs[], void *i[]);
// debug
void set_mu (float a_mu) {
assert (0 <= a_mu && a_mu <= 1.9);
use_right_p = a_mu < 1.0;
mu = a_mu - floor (a_mu);
cerr << "BTL2: mu: " << mu << " use_right_p: " << use_right_p << endl;
}
protected:
typedef float iType;
typedef float oType;
iType produce_sample (const iType *in, unsigned int &index);
float filter_error (float e);
VrSampleIndex next_input;
gr_single_pole_iir<float,float,float> dc; // used to estimate DC component
gr_mmse_fir_interpolator intr;
float mu; // fractional delay
iType last_right; // last right hand sample
bool use_right_p; // ...else middle
};
#endif // _GRATSCBITTIMINGLOOP2_H_
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