Merge commit 'v3.3.0' into upstream

[debian/gnuradio] / gr-atsc / src / lib / atsci_fake_single_viterbi.cc

diff --git a/gr-atsc/src/lib/atsci_fake_single_viterbi.cc b/gr-atsc/src/lib/atsci_fake_single_viterbi.cc
new file mode 100644 (file)
index 0000000..bf5cf9a
--- /dev/null
+++ b/gr-atsc/src/lib/atsci_fake_single_viterbi.cc
@@ -0,0 +1,72 @@
+/* -*- 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 <math.h>
+#include <atsci_fake_single_viterbi.h>
+#include <iostream>
+#include <algorithm>
+
+using std::cerr;
+using std::cout;
+
+void
+atsci_fake_single_viterbi::reset()
+{
+  post_coder_state = 0;
+}
+
+atsci_fake_single_viterbi::atsci_fake_single_viterbi()
+{
+  reset();
+}
+
+/*
+ * implement simple slicer and post coder
+ */
+char
+atsci_fake_single_viterbi::decode (float input)
+{
+  int  y2, y1;
+  
+  if (input < -4){
+    y2 = 0;
+    y1 = 0;
+  }
+  else if (input < 0){
+    y2 = 0;
+    y1 = 1;
+  }
+  else if (input < 4){
+    y2 = 1;
+    y1 = 0;
+  }
+  else {
+    y2 = 1;
+    y1 = 1;
+  }
+
+  int  x1 = y1;
+  int  x2 = y2 ^ post_coder_state;
+  post_coder_state = y2;
+
+  return (x2 << 1) | x1;
+}