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comparison m-toolbox/classes/@specwin/win_nuttall3.m @ 0:f0afece42f48

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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-1:000000000000 0:f0afece42f48
1 % WIN_NUTTALL3 returns Nuttall3 window, with N points.
2 % If mode == 'define', the window values will be empty and all the features
3 % If mode == 'build', the window values will be calculated
4 %
5 % M Hewitson 18-05-07
6 %
7 % $Id: win_nuttall3.m,v 1.5 2011/05/25 07:30:08 mauro Exp $
8 %
9 function varargout = win_nuttall3(w, mode, N)
10
11 switch lower(mode)
12
13 case 'build'
14 n_args = nargin;
15 if n_args < 3
16 N = w.len;
17 end
18 % Calculate the values of the window
19 z = [0:N-1]./N * 2 * pi;
20 varargout{1} = 0.375 - 0.5 * cos (z) + 0.125 * cos (2 * z);
21
22 case 'define'
23 % Make window struct
24 w.type = 'Nuttall3';
25 w.alpha = 0;
26 w.psll = 46.7;
27 w.rov = 64.7;
28 w.nenbw = 1.9444;
29 w.w3db = 1.8496;
30 w.flatness = -0.8630;
31 w.len = N;
32 w.skip = 0;
33
34 varargout{1} = w;
35 end
36
37 % END
38