+
−% WIN_HFT90D returns HFT90D 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_hft90d.m,v 1.5 2011/05/25 07:30:09 mauro Exp $
+
−%
+
−
+
−function varargout = win_hft90d(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} =  (1 - 1.942604 * cos (z) + ...
+
−                       1.340318 * cos (2 * z) - 0.440811 * cos (3 * z) + ...
+
−                       0.043097 * cos (4 * z));
+
−      
+
−    case 'define'
+
−      % Make window struct
+
−      w.type         = 'HFT90D';
+
−      w.alpha        = 0;
+
−      w.psll         = 90.2;
+
−      w.rov          = 76;
+
−      w.nenbw        = 3.8832;
+
−      w.w3db         = 3.8320;
+
−      w.flatness     = -0.0039;
+
−      w.len          = N;
+
−      w.skip         = 0;
+
−      
+
−      varargout{1}   = w;
+
−  end
+
−  
+
−  % END