1 files changed, 36 insertions, 0 deletions
diff --git a/gr-atsc/src/lib/atsci_root_raised_cosine.cc b/gr-atsc/src/lib/atsci_root_raised_cosine.cc
new file mode 100644
index 000000000..00912ad53
--- /dev/null
+++ b/gr-atsc/src/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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <atsc_consts.h>
+#include <atsci_root_raised_cosine.h>
+#include <gr_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_firdes::root_raised_cosine (1.0, sampling_rate, symbol_rate, .115, NTAPS);
+}