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annotate scripts/control/system/sys2fir.m @ 7016:93c65f2a5668

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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents 2618a0750ae6
children a1dbe9d80eee
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1 ## Copyright (C) 1996 Auburn University. All rights reserved.
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{c}, @var{tsam}, @var{input}, @var{output}] =} sys2fir (@var{sys})
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21 ##
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22 ## Extract @acronym{FIR} data from system data structure; see @command{fir2sys} for
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23 ## parameter descriptions.
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24 ## @seealso{fir2sys}
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25 ## @end deftypefn
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27 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
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28 ## Created: July 1996
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29
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30 function [c, tsam, inname, outname] = sys2fir (sys)
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31
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32 ## let sys2tf do most of the work
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34 [num, den, tsam, inname, outname] = sys2tf (sys);
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36 alph = den(1); # scale to get monic denominator
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37 den /= alph;
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38 num /= alph;
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39 l = length (den);
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40 m = length (num);
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41 if (norm (den(2:l)))
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42 sysout (sys, "tf");
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43 error ("denominator has poles away from origin");
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44 elseif (! is_digital (sys))
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45 error ("system must be discrete-time to be FIR");
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46 elseif (m != l)
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47 warning ("sys2fir: deg(num) - deg(den) = %d; coefficients must be shifted",
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48 m-l);
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49 endif
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50 c = num;
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52 endfunction
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