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annotate m-toolbox/classes/@specwin/win_nuttall3b.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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f0afece42f48 Import.
Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % WIN_NUTTALL3B returns Nuttall3b window, with N points.
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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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Daniele Nicolodi <nicolodi@science.unitn.it>
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3 % If mode == 'build', the window values will be calculated
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % M Hewitson 18-05-07
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6
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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8 % $Id: win_nuttall3b.m,v 1.5 2011/05/25 07:30:09 mauro Exp $
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9 %
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10
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Daniele Nicolodi <nicolodi@science.unitn.it>
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11 function varargout = win_nuttall3b(w, mode, N)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12
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Daniele Nicolodi <nicolodi@science.unitn.it>
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13 switch lower(mode)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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14
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Daniele Nicolodi <nicolodi@science.unitn.it>
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15 case 'build'
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Daniele Nicolodi <nicolodi@science.unitn.it>
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16 n_args = nargin;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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17 if n_args < 3
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Daniele Nicolodi <nicolodi@science.unitn.it>
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18 N = w.len;
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19 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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20 % Calculate the values of the window
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Daniele Nicolodi <nicolodi@science.unitn.it>
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21 z = [0:N-1]./N * 2 * pi;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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22 varargout{1} = 0.4243801 - 0.4973406 * cos (z) + 0.0782793 * cos (2 * z);
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23
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Daniele Nicolodi <nicolodi@science.unitn.it>
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24 case 'define'
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Daniele Nicolodi <nicolodi@science.unitn.it>
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25 % Make window struct
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Daniele Nicolodi <nicolodi@science.unitn.it>
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26 w.type = 'Nuttall3b';
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Daniele Nicolodi <nicolodi@science.unitn.it>
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27 w.alpha = 0;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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28 w.psll = 71.5;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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29 w.rov = 59.8;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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30 w.nenbw = 1.7037;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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31 w.w3db = 1.6162;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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32 w.flatness = -1.1352;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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33 w.len = N;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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34 w.skip = 0;
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35
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Daniele Nicolodi <nicolodi@science.unitn.it>
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36 varargout{1} = w;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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37 end
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38
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Daniele Nicolodi <nicolodi@science.unitn.it>
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39 % END
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