3 * Copyright 2009 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.
23 #ifndef INCLUDED_NOAA_HRPT_SYNC_FB_H
24 #define INCLUDED_NOAA_HRPT_SYNC_FB_H
28 class noaa_hrpt_sync_fb;
29 typedef boost::shared_ptr<noaa_hrpt_sync_fb> noaa_hrpt_sync_fb_sptr;
31 noaa_hrpt_sync_fb_sptr
32 noaa_make_hrpt_sync_fb(float alpha, float beta, float sps, float max_offset);
34 class noaa_hrpt_sync_fb : public gr_block
36 friend noaa_hrpt_sync_fb_sptr noaa_make_hrpt_sync_fb(float alpha, float beta, float sps, float max_offset);
37 noaa_hrpt_sync_fb(float alpha, float beta, float sps, float max_offset);
39 float d_alpha; // 1st order loop constant
40 float d_beta; // 2nd order loop constant
41 float d_sps; // samples per symbol
42 float d_max_offset; // Maximum frequency offset for d_sps, samples/symbol
43 float d_phase; // Instantaneous symbol phase
44 float d_freq; // Instantaneous symbol frequency, samples/symbol
45 int d_last_sign; // Tracks zero crossings
48 int general_work(int noutput_items,
49 gr_vector_int &ninput_items,
50 gr_vector_const_void_star &input_items,
51 gr_vector_void_star &output_items);
53 void set_alpha(float alpha) { d_alpha = alpha; }
54 void set_beta(float beta) { d_beta = beta; }
55 void set_max_offset(float max_offset) { d_max_offset = max_offset; }
58 #endif /* INCLUDED_NOAA_HRPT_SYNC_FB_H */