/usr/include/gnuradio/dtv/atsc_fpll.h is in gnuradio-dev 3.7.9.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* 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_FPLL_H
#define INCLUDED_DTV_ATSC_FPLL_H
#include <gnuradio/dtv/api.h>
#include <gnuradio/sync_block.h>
namespace gr {
namespace dtv {
/*!
* \brief ATSC Receiver FPLL
*
* This block is takes in a complex I/Q baseband stream from the
* receive filter and outputs the 8-level symbol stream.
*
* It does this by first locally generating a pilot tone and
* complex mixing with the input signal. This results in the
* pilot tone shifting to DC and places the signal in the upper
* sideband.
*
* As no information is encoded in the phase of the waveform, the
* Q channel is then discarded, producing a real signal with the
* lower sideband restored.
*
* The 8-level symbol stream still has a DC offset, and still
* requires symbol timing recovery.
*
* \ingroup dtv_atsc
*/
class DTV_API atsc_fpll : virtual public gr::sync_block
{
public:
// gr::dtv::atsc_fpll::sptr
typedef boost::shared_ptr<atsc_fpll> sptr;
/*!
* \brief Make a new instance of gr::dtv::atsc_fpll.
*
* param rate Sample rate of incoming stream
*/
static sptr make(float rate);
};
} /* namespace dtv */
} /* namespace gr */
#endif /* INCLUDED_DTV_ATSC_FPLL_H */
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