3 * Copyright 2002 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 #include <atsc_consts.h>
24 #include <atsci_root_raised_cosine.h>
25 #include <gr_firdes.h>
28 atsc_root_raised_cosine::taps (double sampling_rate)
30 static const double symbol_rate = ATSC_SYMBOL_RATE/2; // 1/2 as wide because we're designing lp filter
31 // static const int NTAPS = 93; // good number
32 // static const int NTAPS = 745; // better number
33 static const int NTAPS = 279; // better number
35 return gr_firdes::root_raised_cosine (1.0, sampling_rate, symbol_rate, .115, NTAPS);