view m-toolbox/classes/@specwin/win_levelledhanning.m @ 39:11e3ed9d2115
database-connection-manager
Implement databases listing in database connection dialog
author
Daniele Nicolodi <nicolodi@science.unitn.it>
date
Mon, 05 Dec 2011 16:20:06 +0100 (2011-12-05)
parents
f0afece42f48
children
line source
+ − % WIN_LEVELLEDHANNING returns Hanning window, with N points and levelCoef levelling order
+ − % If mode == 'define', the window values will be empty and all the features
+ − % If mode == 'build', the window values will be calculated
+ − %
+ − % A Grynagier 03/01/2010
+ − %
+ − % $Id: win_levelledhanning.m,v 1.1 2011/05/24 16:23:21 mauro Exp $
+ − %
+ −
+ − function varargout = win_levelledhanning(w, mode, N, levelCoef)
+ −
+ − switch lower(mode)
+ −
+ − case 'build'
+ − n_args = nargin;
+ − if n_args < 3
+ − N = w.len;
+ − end
+ − if n_args < 4
+ − levelCoef = w.levelorder;
+ − end
+ − % Calculate the values of the window
+ − z = (1:N)./(N+1);
+ − v = 0.5 * (1 - cos(2*pi*z));
+ −
+ − for jj = 1:levelCoef
+ − v = v.*(2-v);
+ − end
+ − varargout{1} = v/norm(v)*length(v)^0.5;
+ −
+ − case 'define'
+ − % Make window struct
+ − w.type = 'levelledHanning';
+ − w.len = N;
+ − w.levelorder = levelCoef;
+ − w.skip = 0;
+ −
+ − varargout{1} = w;
+ − end
+ −
+ − % END