--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/classes/@specwin/win_nuttall4c.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,38 @@
+% WIN_NUTTALL4C returns Nuttall4c 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_nuttall4c.m,v 1.5 2011/05/25 07:30:08 mauro Exp $
+%
+
+function varargout = win_nuttall4c(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} = 0.3635819 - 0.4891775 * cos (z) + 0.1365995 * cos (2 * z) - 0.0106411 * cos (3 * z);
+      
+    case 'define'
+      % Make window struct
+      w.type         = 'Nuttall4c';
+      w.alpha        = 0;
+      w.psll         = 98.1;
+      w.rov          = 65.6;
+      w.nenbw        = 1.9761;
+      w.w3db         = 1.8687;
+      w.flatness     = -0.8506;
+      w.len          = N;
+      w.skip         = 0;
+      
+      varargout{1}   = w;
+  end
+  
+  % END