GNU Radio 3.5.1 C++ API
gr_hilbert_fc.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_HILBERT_FC_H
00024 #define INCLUDED_GR_HILBERT_FC_H
00025 
00026 #include <gr_core_api.h>
00027 #include <gr_sync_block.h>
00028 #include <gr_io_signature.h>
00029 #include <gr_types.h>
00030 
00031 class gr_hilbert_fc;
00032 typedef boost::shared_ptr<gr_hilbert_fc> gr_hilbert_fc_sptr;
00033 
00034 // public constructor
00035 GR_CORE_API gr_hilbert_fc_sptr gr_make_hilbert_fc (unsigned int ntaps);
00036 
00037 
00038 class gr_fir_fff;
00039 
00040 /*!
00041  * \brief Hilbert transformer.
00042  * \ingroup filter_blk
00043  *
00044  * real output is input appropriately delayed.
00045  * imaginary output is hilbert filtered (90 degree phase shift)
00046  * version of input.
00047  */
00048 class GR_CORE_API gr_hilbert_fc : public gr_sync_block
00049 {
00050  public:
00051   ~gr_hilbert_fc ();
00052 
00053   int work (int noutput_items,
00054             gr_vector_const_void_star &input_items,
00055             gr_vector_void_star &output_items);
00056 
00057  protected:
00058   gr_hilbert_fc (unsigned int ntaps);
00059 
00060  private:
00061   unsigned int   d_ntaps;
00062   gr_fir_fff    *d_hilb;
00063 
00064   friend GR_CORE_API gr_hilbert_fc_sptr gr_make_hilbert_fc (unsigned int ntaps);
00065 };
00066 
00067 
00068 
00069 #endif /* INCLUDED_GR_HILBERT_FC_H */