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comparison m-toolbox/classes/@specwin/win_nuttall4c.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_NUTTALL4C returns Nuttall4c 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_nuttall4c.m,v 1.5 2011/05/25 07:30:08 mauro Exp $
8 %
9
10 function varargout = win_nuttall4c(w, mode, N)
11
12 switch lower(mode)
13
14 case 'build'
15 n_args = nargin;
16 if n_args < 3
17 N = w.len;
18 end
19 % Calculate the values of the window
20 z = [0:N-1]./N * 2 * pi;
21 varargout{1} = 0.3635819 - 0.4891775 * cos (z) + 0.1365995 * cos (2 * z) - 0.0106411 * cos (3 * z);
22
23 case 'define'
24 % Make window struct
25 w.type = 'Nuttall4c';
26 w.alpha = 0;
27 w.psll = 98.1;
28 w.rov = 65.6;
29 w.nenbw = 1.9761;
30 w.w3db = 1.8687;
31 w.flatness = -0.8506;
32 w.len = N;
33 w.skip = 0;
34
35 varargout{1} = w;
36 end
37
38 % END