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annotate m-toolbox/classes/@specwin/win_hft144d.m @ 43:bc767aaa99a8

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CVS Update
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Tue, 06 Dec 2011 11:09:25 +0100
parents f0afece42f48
children
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % WIN_HFT144D returns HFT144D window, with N points.
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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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5 % M Hewitson 18-05-07
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6 %
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7 % $Id: win_hft144d.m,v 1.5 2011/05/25 07:30:09 mauro Exp $
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8 %
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9
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10 function varargout = win_hft144d(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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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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17 N = w.len;
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18 end
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19 % Calculate the values of the window
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20 z = [0:N-1]./N * 2 * pi;
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21 varargout{1} = (1 - 1.96760033 * cos (z) ...
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22 + 1.57983607 * cos (2 * z) - 0.81123644 * cos (3 * z) + ...
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23 0.22583558 * cos (4 * z) - 0.02773848 * cos (5 * z) + ...
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24 0.00090360 * cos (6 * z));
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25
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26 case 'define'
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27 % Make window struct
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28 w.type = 'HFT144D';
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29 w.alpha = 0;
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30 w.psll = 144.1;
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31 w.rov = 79.9;
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32 w.nenbw = 4.5386;
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33 w.w3db = 4.4697;
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34 w.flatness = 0.0021;
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35 w.len = N;
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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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41 % END