% WIN_FTHP returns FTHP 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_fthp.m,v 1.5 2011/05/25 07:30:09 mauro Exp $
%

function varargout = win_fthp(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 + 1.912510941 * cos (z) + ...
                       1.079173272 * cos (2 * z) + ...
                       0.1832630879 * cos (3 * z));
      
    case 'define'
      % Make window struct
      w.type     = 'FTHP';
      w.alpha    = 0;
      w.psll     = 70.4;
      w.rov      = 72.3;
      w.nenbw    = 3.4279;
      w.w3db     = 3.3846;
      w.flatness = 0.0096;
      w.len          = N;
      w.skip         = 0;
      
      varargout{1}   = w;
  end
  
  % END
