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annotate m-toolbox/classes/@specwin/win_levelledhanning.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % WIN_LEVELLEDHANNING returns Hanning window, with N points and levelCoef levelling order
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 % If mode == 'define', the window values will be empty and all the features
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3 % If mode == 'build', the window values will be calculated
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4 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % A Grynagier 03/01/2010
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6 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 % $Id: win_levelledhanning.m,v 1.1 2011/05/24 16:23:21 mauro Exp $
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8 %
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9
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Daniele Nicolodi <nicolodi@science.unitn.it>
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10 function varargout = win_levelledhanning(w, mode, N, levelCoef)
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11
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12 switch lower(mode)
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13
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14 case 'build'
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15 n_args = nargin;
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16 if n_args < 3
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Daniele Nicolodi <nicolodi@science.unitn.it>
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17 N = w.len;
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18 end
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19 if n_args < 4
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20 levelCoef = w.levelorder;
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21 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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22 % Calculate the values of the window
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Daniele Nicolodi <nicolodi@science.unitn.it>
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23 z = (1:N)./(N+1);
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Daniele Nicolodi <nicolodi@science.unitn.it>
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24 v = 0.5 * (1 - cos(2*pi*z));
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25
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Daniele Nicolodi <nicolodi@science.unitn.it>
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26 for jj = 1:levelCoef
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27 v = v.*(2-v);
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28 end
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29 varargout{1} = v/norm(v)*length(v)^0.5;
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30
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31 case 'define'
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32 % Make window struct
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Daniele Nicolodi <nicolodi@science.unitn.it>
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33 w.type = 'levelledHanning';
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34 w.len = N;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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35 w.levelorder = levelCoef;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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36 w.skip = 0;
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37
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38 varargout{1} = w;
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39 end
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40
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Daniele Nicolodi <nicolodi@science.unitn.it>
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41 % END