3 * Copyright 2004 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
27 #include <gr_hilbert_fc.h>
28 #include <gr_firdes.h>
29 #include <gr_fir_fff.h>
30 #include <gr_fir_util.h>
34 gr_make_hilbert_fc (unsigned int ntaps)
36 return gr_hilbert_fc_sptr (new gr_hilbert_fc (ntaps));
39 gr_hilbert_fc::gr_hilbert_fc (unsigned int ntaps)
40 : gr_sync_block ("hilbert_fc",
41 gr_make_io_signature (1, 1, sizeof (float)),
42 gr_make_io_signature (1, 1, sizeof (gr_complex))),
43 d_ntaps (ntaps | 0x1), // ensure ntaps is odd
44 d_hilb (gr_fir_util::create_gr_fir_fff (gr_firdes::hilbert (d_ntaps)))
46 set_history (d_ntaps);
49 gr_hilbert_fc::~gr_hilbert_fc ()
55 gr_hilbert_fc::work (int noutput_items,
56 gr_vector_const_void_star &input_items,
57 gr_vector_void_star &output_items)
59 float *in = (float *) input_items[0];
60 gr_complex *out = (gr_complex *) output_items[0];
62 for (int i = 0; i < noutput_items; i++)
63 out[i] = gr_complex (in[i + d_ntaps/2],
64 d_hilb->filter (&in[i]));