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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 _GRATSCSEGSYMSYNCIMPL_H_
#define _GRATSCSEGSYMSYNCIMPL_H_
#include <GrAtscSegSymSync.h>
#include <atsci_sssr.h>
/*!
* \brief concrete implementation of GrAtscSegSymSync
*
* This class implements data segment sync tracking and symbol timing
* using a variation of the method described in
* "ATSC/VSB Tutorial - Receiver Technology" by Wayne E. Bretl of
* Zenith, pgs 41-45.
*/
class GrAtscSegSymSyncImpl : public GrAtscSegSymSync {
atsci_sssr d_sssr;
atsci_interpolator d_interp;
VrSampleIndex d_next_input;
double d_rx_clock_to_symbol_freq; // nominal ratio
public:
// the standard methods...
GrAtscSegSymSyncImpl (double nominal_ratio_of_rx_clock_to_symbol_freq);
virtual ~GrAtscSegSymSyncImpl ();
virtual const char *name () { return "GrAtscSegSymSyncImpl"; }
virtual int forecast (VrSampleRange output,
VrSampleRange inputs[]);
virtual int work (VrSampleRange output, void *o[],
VrSampleRange inputs[], void *i[]);
void pre_initialize ();
// reset on channel change
virtual void reset ();
};
#endif /* _GRATSCSEGSYMSYNCIMPL_H_ */
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