GNU Radio 3.6.4.1 C++ API
atsci_fs_correlator.h
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/* -*- c++ -*- */
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/*
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* Copyright 2002 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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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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* any later version.
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*
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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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*
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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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*/
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#ifndef _ATSC_FS_CORRELATOR_H_
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#define _ATSC_FS_CORRELATOR_H_
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#include <
atsc_api.h
>
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/*!
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* \brief abstract base class for ATSC field sync correlator
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*
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* Processes input samples one at a time looking for
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* an occurence of either the field sync 1 or field sync 2 pattern.
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*
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* For each sample processed, an output sample and an output tag are produced.
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* The output samples are identical to the input samples but are delayed by
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* a number of samples given by \p delay(). The output tag associated with
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* the the given output sample indicates whether this sample is the beginning
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* of one of the field syncs or is an ordinary sample. The tags are defined in
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* atsci_sync_tag.h.
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*
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* For ease of use, the field sync patterns are defined to begin with the
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* first symbol of the 4 symbol data segment sync pattern that immediately
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* proceeds the actual PN 511 code. This makes it easier for downstream code
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* to determine the location of data segment syncs merely by counting. They'll
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* occur every 832 samples assuming everything is working.
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*/
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class
ATSC_API
atsci_fs_correlator
{
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public
:
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// CREATORS
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atsci_fs_correlator
();
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virtual
~
atsci_fs_correlator
() = 0;
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// MANIPULATORS
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virtual
void
reset () = 0;
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virtual
void
filter (
float
input_sample,
float
*output_sample,
float
*output_tag) = 0;
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// ACCESSORS
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//! return delay in samples from input to output
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virtual
int
delay ()
const
= 0;
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};
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#endif
/* _ATSC_FS_CORRELATOR_H_ */
gr-atsc
src
lib
atsci_fs_correlator.h
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