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annotate m-toolbox/classes/@specwin/win_nuttall4c.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_NUTTALL4C returns Nuttall4c 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 % $Id: win_nuttall4c.m,v 1.5 2011/05/25 07:30:08 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_nuttall4c(w, mode, N)
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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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Daniele Nicolodi <nicolodi@science.unitn.it>
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13
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Daniele Nicolodi <nicolodi@science.unitn.it>
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14 case 'build'
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Daniele Nicolodi <nicolodi@science.unitn.it>
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15 n_args = nargin;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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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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Daniele Nicolodi <nicolodi@science.unitn.it>
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19 % Calculate the values of the window
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Daniele Nicolodi <nicolodi@science.unitn.it>
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20 z = [0:N-1]./N * 2 * pi;
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21 varargout{1} = 0.3635819 - 0.4891775 * cos (z) + 0.1365995 * cos (2 * z) - 0.0106411 * cos (3 * z);
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22
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23 case 'define'
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Daniele Nicolodi <nicolodi@science.unitn.it>
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24 % Make window struct
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Daniele Nicolodi <nicolodi@science.unitn.it>
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25 w.type = 'Nuttall4c';
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Daniele Nicolodi <nicolodi@science.unitn.it>
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26 w.alpha = 0;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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27 w.psll = 98.1;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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28 w.rov = 65.6;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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29 w.nenbw = 1.9761;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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30 w.w3db = 1.8687;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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31 w.flatness = -0.8506;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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32 w.len = N;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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33 w.skip = 0;
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34
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Daniele Nicolodi <nicolodi@science.unitn.it>
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35 varargout{1} = w;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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36 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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37
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Daniele Nicolodi <nicolodi@science.unitn.it>
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38 % END