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1 ## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2005, 2007 |
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2 ## Friedrich Leisch |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} triangle_sw (@var{n}, @var{b}) |
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22 ## Triangular spectral window. Subfunction used for spectral density |
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23 ## estimation. |
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24 ## @end deftypefn |
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25 |
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26 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> |
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27 ## Description: Triangular spectral window |
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28 |
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29 function retval = triangle_sw (n, b) |
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30 |
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31 if (nargin != 2) |
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32 print_usage (); |
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33 endif |
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34 |
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35 retval = zeros(n,1); |
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36 retval(1) = 1 / b; |
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37 |
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38 l = (2:n)' - 1; |
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39 l = 2 * pi * l / n; |
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40 |
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41 retval(2:n) = b * (sin (l / (2*b)) ./ sin (l / 2)).^2; |
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42 |
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43 endfunction |
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