--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/classes/@specwin/win_sft4m.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,39 @@
+% WIN_SFT4M returns SFT4M window, with N points.
+% If mode == 'define', the window values will be empty and all the features
+% If mode == 'build', the window values will be calculated
+%
+% M Hewitson 18-05-07
+%
+% $Id: win_sft4m.m,v 1.5 2011/05/25 07:30:09 mauro Exp $
+%
+
+function varargout = win_sft4m(w, mode, N)
+  
+  switch lower(mode)
+    
+    case 'build'
+      n_args = nargin;
+      if n_args < 3
+        N = w.len;
+      end
+      % Calculate the values of the window
+      z            = [0:N-1]./N * 2 * pi;
+      varargout{1} = 0.241906 - 0.460841 * cos(z) ...
+                   + 0.255381 * cos (2 * z) - 0.041872 * cos (3 * z);
+      
+    case 'define'
+      % Make window struct
+      w.type         = 'SFT4M';
+      w.alpha        = 0;
+      w.psll         = 66.5;
+      w.rov          = 72.1;
+      w.nenbw        = 3.3868;
+      w.w3db         = 3.3451;
+      w.flatness     = -0.0067;
+      w.len          = N;
+      w.skip         = 0;
+      
+      varargout{1}   = w;
+  end
+  
+  % END