Mercurial > hg > octave-lyh

annotate scripts/control/system/sys2fir.m @ 7156:77de8319c337 ss-2-9-17

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
[project @ 2007-11-10 06:16:59 by jwe]
author jwe
date Sat, 10 Nov 2007 06:17:00 +0000
parents f084ba47812b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
7017
a1dbe9d80eee [project @ 2007-10-12 21:27:11 by jwe]
jwe
parents: 7016
diff changeset
1 ## Copyright (C) 1996, 2000, 2003, 2004, 2005, 2006, 2007
a1dbe9d80eee [project @ 2007-10-12 21:27:11 by jwe]
jwe
parents: 7016
diff changeset
2 ## Auburn University. All rights reserved.
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
3 ##
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
4 ## This file is part of Octave.
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
5 ##
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
6 ## Octave is free software; you can redistribute it and/or modify it
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
7 ## under the terms of the GNU General Public License as published by
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
8 ## the Free Software Foundation; either version 3 of the License, or (at
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
9 ## your option) any later version.
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
10 ##
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
11 ## Octave is distributed in the hope that it will be useful, but
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
14 ## General Public License for more details.
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
15 ##
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
16 ## You should have received a copy of the GNU General Public License
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
17 ## along with Octave; see the file COPYING. If not, see
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5642
diff changeset
18 ## <http://www.gnu.org/licenses/>.
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
19
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
20 ## -*- texinfo -*-
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
21 ## @deftypefn {Function File} {[@var{c}, @var{tsam}, @var{input}, @var{output}] =} sys2fir (@var{sys})
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
22 ##
5016
bdbee5282954 [project @ 2004-09-22 02:50:35 by jwe]
jwe
parents: 4462
diff changeset
23 ## Extract @acronym{FIR} data from system data structure; see @command{fir2sys} for
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
24 ## parameter descriptions.
5642
2618a0750ae6 [project @ 2006-03-06 21:26:48 by jwe]
jwe
parents: 5307
diff changeset
25 ## @seealso{fir2sys}
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
26 ## @end deftypefn
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
27
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
28 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
29 ## Created: July 1996
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
30
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
31 function [c, tsam, inname, outname] = sys2fir (sys)
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
32
7125
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
33 if (nargin != 1)
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
34 print_usage ();
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
35 endif
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
36
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
37 ## let sys2tf do most of the work
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
38
4462
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
39 [num, den, tsam, inname, outname] = sys2tf (sys);
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
40
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
41 alph = den(1); # scale to get monic denominator
4462
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
42 den /= alph;
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
43 num /= alph;
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
44 l = length (den);
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
45 m = length (num);
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
46 if (norm (den(2:l)))
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
47 sysout (sys, "tf");
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
48 error ("denominator has poles away from origin");
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
49 elseif (! is_digital (sys))
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
50 error ("system must be discrete-time to be FIR");
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
51 elseif (m != l)
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
52 warning ("sys2fir: deg(num) - deg(den) = %d; coefficients must be shifted",
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
53 m-l);
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
54 endif
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
55 c = num;
4462
3e48e60a1f8b [project @ 2003-07-12 03:31:41 by jwe]
jwe
parents: 3439
diff changeset
56
3430
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
57 endfunction
65b3519ac3a1 [project @ 2000-01-14 03:44:03 by jwe]
jwe
parents:
diff changeset
58