1 files changed, 63 insertions, 0 deletions
diff --git a/gr-atsc/lib/gen_encoder.py b/gr-atsc/lib/gen_encoder.py
new file mode 100755
index 0000000000..6c8fabf7ad
--- /dev/null
+++ b/gr-atsc/lib/gen_encoder.py
@@ -0,0 +1,63 @@
+#!/usr/bin/python
+#
+# 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.
+#
+
+def output(input, state):
+    x2 = (input >> 1) & 0x1
+    x1 = (input >> 0) & 0x1
+    s = (state >> 2) & 0x1
+    t = (state >> 1) & 0x1
+    u = (state >> 0) & 0x1
+
+    z0 = u
+    z1 = x1
+    z2 = x2 ^ s
+    return (z2 << 2) | (z1 << 1) | z0
+
+
+def next_state(input, state):
+    x2 = (input >> 1) & 0x1
+    x1 = (input >> 0) & 0x1
+    s0 = (state >> 2) & 0x1
+    t0 = (state >> 1) & 0x1
+    u0 = (state >> 0) & 0x1
+
+    s1 = x2 ^ s0
+    t1 = u0
+    u1 = t0 ^ x1
+
+    return (s1 << 2) | (t1 << 1) | u1
+
+print "@@@ NEXT @@@"
+
+for i in range (32):
+    state = (i >> 2) & 0x7
+    input = i & 0x3
+    print next_state (input, state)
+
+
+print "@@@ OUTPUT @@@"
+
+for i in range (32):
+    state = (i >> 2) & 0x7
+    input = i & 0x3
+    print output (input, state)
+