diff options
Diffstat (limited to 'gr-atsc/lib/atsci_root_raised_cosine.cc')
| -rw-r--r-- | gr-atsc/lib/atsci_root_raised_cosine.cc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/gr-atsc/lib/atsci_root_raised_cosine.cc b/gr-atsc/lib/atsci_root_raised_cosine.cc new file mode 100644 index 0000000000..c5cedbd1fc --- /dev/null +++ b/gr-atsc/lib/atsci_root_raised_cosine.cc @@ -0,0 +1,36 @@ +/* -*- c++ -*- */ +/* + * Copyright 2002 Free Software Foundation, Inc. + * + * This file is part of GNU Radio + * + * GNU Radio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3, or (at your option) + * any later version. + * + * GNU Radio is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Radio; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, + * Boston, MA 02110-1301, USA. + */ + +#include <atsc/consts.h> +#include <atsc/root_raised_cosine_impl.h> +#include <filter/firdes.h> + +vector<float> +atsc_root_raised_cosine::taps (double sampling_rate) +{ + static const double symbol_rate = ATSC_SYMBOL_RATE/2; // 1/2 as wide because we're designing lp filter + // static const int NTAPS = 93; // good number + // static const int NTAPS = 745; // better number + static const int NTAPS = 279; // better number + + return gr::filter::firdes::root_raised_cosine(1.0, sampling_rate, symbol_rate, .115, NTAPS); +} |