diff options
| author | Tom Rondeau <trondeau@vt.edu> | 2013-03-15 20:49:05 -0400 |
|---|---|---|
| committer | Tom Rondeau <trondeau@vt.edu> | 2013-03-15 20:49:05 -0400 |
| commit | 3d38e82e7d87dfc01132b199e33b53add8a706fa (patch) | |
| tree | af4545bcf3cea24dc30571601116a3a89381ad5d /gr-atsc/lib/gen_encoder.py | |
| parent | 39ff6d4814c858f2dbaf3c8007940872c46d6c95 (diff) | |
atsc: adjustments to atsc to start to conform to v3.7 structure.
Not going to comply completely with the new structure; just wanted to get it so that it looked more consistent once installed.
Diffstat (limited to 'gr-atsc/lib/gen_encoder.py')
| -rwxr-xr-x | gr-atsc/lib/gen_encoder.py | 63 |
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) + |