X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gr-atsc%2Fsrc%2Flib%2Fatsci_fake_single_viterbi.cc;fp=gr-atsc%2Fsrc%2Flib%2Fatsci_fake_single_viterbi.cc;h=bf5cf9ab7a8267f73be16f1cd3b2087234152655;hb=8a9ddbb0675f9bfcc6e03b457fba6c79474a3693;hp=0000000000000000000000000000000000000000;hpb=82d471b9b4a8b389b5da44b19c69c36420828382;p=debian%2Fgnuradio

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
index 00000000..bf5cf9ab
--- /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;
+}