Mercurial > hg > ltpda
comparison m-toolbox/classes/@specwin/win_levelledhanning.m @ 0:f0afece42f48
Import.
| author | Daniele Nicolodi <nicolodi@science.unitn.it> |
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| date | Wed, 23 Nov 2011 19:22:13 +0100 |
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| -1:000000000000 | 0:f0afece42f48 |
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| 1 % WIN_LEVELLEDHANNING returns Hanning window, with N points and levelCoef levelling order | |
| 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 % A Grynagier 03/01/2010 | |
| 6 % | |
| 7 % $Id: win_levelledhanning.m,v 1.1 2011/05/24 16:23:21 mauro Exp $ | |
| 8 % | |
| 9 | |
| 10 function varargout = win_levelledhanning(w, mode, N, levelCoef) | |
| 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 if n_args < 4 | |
| 20 levelCoef = w.levelorder; | |
| 21 end | |
| 22 % Calculate the values of the window | |
| 23 z = (1:N)./(N+1); | |
| 24 v = 0.5 * (1 - cos(2*pi*z)); | |
| 25 | |
| 26 for jj = 1:levelCoef | |
| 27 v = v.*(2-v); | |
| 28 end | |
| 29 varargout{1} = v/norm(v)*length(v)^0.5; | |
| 30 | |
| 31 case 'define' | |
| 32 % Make window struct | |
| 33 w.type = 'levelledHanning'; | |
| 34 w.len = N; | |
| 35 w.levelorder = levelCoef; | |
| 36 w.skip = 0; | |
| 37 | |
| 38 varargout{1} = w; | |
| 39 end | |
| 40 | |
| 41 % END |