diff options
Diffstat (limited to 'gr-dtv/lib/atsc/atsc_sync_impl.h')
| -rw-r--r-- | gr-dtv/lib/atsc/atsc_sync_impl.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/gr-dtv/lib/atsc/atsc_sync_impl.h b/gr-dtv/lib/atsc/atsc_sync_impl.h new file mode 100644 index 0000000000..eb0ad17286 --- /dev/null +++ b/gr-dtv/lib/atsc/atsc_sync_impl.h @@ -0,0 +1,83 @@ +/* -*- c++ -*- */ +/* + * Copyright 2014 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_DTV_ATSC_SYNC_IMPL_H +#define INCLUDED_DTV_ATSC_SYNC_IMPL_H + +#include <gnuradio/dtv/atsc_consts.h> +#include <gnuradio/dtv/atsc_sync.h> +#include <gnuradio/filter/single_pole_iir.h> +#include <gnuradio/filter/mmse_fir_interpolator_ff.h> + +namespace gr { + namespace dtv { + + class atsc_sync_impl : public atsc_sync + { + private: + static const double LOOP_FILTER_TAP = 0.0005; // 0.0005 works + static const double ADJUSTMENT_GAIN = 1.0e-5 / (10 * ATSC_DATA_SEGMENT_LENGTH); + static const int SYMBOL_INDEX_OFFSET = 3; + static const int MIN_SEG_LOCK_CORRELATION_VALUE = 5; + static const int SSI_MIN = -16; + static const int SSI_MAX = 15; + + gr::filter::single_pole_iir<float,float,float> d_loop; // ``VCO'' loop filter + gr::filter::mmse_fir_interpolator_ff d_interp; + + unsigned long long d_next_input; + double d_rx_clock_to_symbol_freq; + int d_si; + double d_w; // ratio of PERIOD of Tx to Rx clocks + double d_mu; // fractional delay [0,1] + int d_incr; + + float sample_mem[ATSC_DATA_SEGMENT_LENGTH]; + float data_mem[ATSC_DATA_SEGMENT_LENGTH]; + + double d_timing_adjust; + int d_counter; // free running mod 832 counter + int d_symbol_index; + bool d_seg_locked; + int d_sr; // 4 bit shift register + signed char d_integrator[ATSC_DATA_SEGMENT_LENGTH]; + int output_produced; + + public: + atsc_sync_impl(float rate); + ~atsc_sync_impl(); + + void reset(); + + void forecast(int noutput_items, + gr_vector_int &ninput_items_required); + + virtual int general_work(int noutput_items, + gr_vector_int &ninput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items); + }; + + } /* namespace dtv */ +} /* namespace gr */ + +#endif /* INCLUDED_DTV_ATSC_SYNC_IMPL_H */ |