3 * Copyright 2007,2009 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.
27 #include <gr_dpll_bb.h>
28 #include <gr_io_signature.h>
32 gr_make_dpll_bb (float period, float gain)
34 return gr_dpll_bb_sptr (new gr_dpll_bb (period, gain));
37 gr_dpll_bb::gr_dpll_bb (float period, float gain)
38 : gr_sync_block ("dpll_bb",
39 gr_make_io_signature (1, 1, sizeof (char)),
40 gr_make_io_signature (1, 1, sizeof (char))),
41 d_restart(0),d_pulse_phase(0)
43 d_pulse_frequency = 1.0/period;
45 d_decision_threshold = 1.0 - 0.5*d_pulse_frequency;
47 fprintf(stderr,"frequency = %f period = %f gain = %f threshold = %f\n",
51 d_decision_threshold);
56 gr_dpll_bb::work (int noutput_items,
57 gr_vector_const_void_star &input_items,
58 gr_vector_void_star &output_items)
60 const char *iptr = (const char *) input_items[0];
61 char *optr = (char *) output_items[0];
63 for (int i = 0; i < noutput_items; i++){
69 if (d_pulse_phase > 0.5) d_pulse_phase += d_gain*(1.0-d_pulse_phase);
70 else d_pulse_phase -= d_gain*d_pulse_phase;
74 if (d_pulse_phase > d_decision_threshold) {
81 d_pulse_phase += d_pulse_frequency;