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Diffstat (limited to 'gr-atsc/include/atsc/GrAtscBitTimingLoop2.h')
-rw-r--r-- | gr-atsc/include/atsc/GrAtscBitTimingLoop2.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/gr-atsc/include/atsc/GrAtscBitTimingLoop2.h b/gr-atsc/include/atsc/GrAtscBitTimingLoop2.h new file mode 100644 index 0000000000..64d25da01e --- /dev/null +++ b/gr-atsc/include/atsc/GrAtscBitTimingLoop2.h @@ -0,0 +1,80 @@ +/* -*- 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 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 _GRATSCBITTIMINGLOOP2_H_ +#define _GRATSCBITTIMINGLOOP2_H_ + +#include <blocks/nco.h> +#include <VrSigProc.h> +#include <VrHistoryProc.h> +#include <VrDecimatingSigProc.h> +#include <atsc/interleaver_fifo.h> +#include <filtersingle_pole_iir.h> +#include <filter/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_ |