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% pop_kaiserbeta() - Estimate Kaiser window beta
%
% Usage:
% >> [beta, dev] = pop_kaiserbeta; % pop-up window mode
% >> beta = pop_kaiserbeta(dev);
%
% Inputs:
% dev - scalar maximum passband deviation/ripple
%
% Output:
% beta - scalar Kaiser window beta
% dev - scalar maximum passband deviation/ripple
%
% References:
% [1] Proakis, J. G., & Manolakis, D. G. (1996). Digital Signal
% Processing: Principles, Algorithms, and Applications (3rd ed.).
% Englewood Cliffs, NJ: Prentice-Hall
%
% Author: Andreas Widmann, University of Leipzig, 2005
%
% See also:
% pop_firws, firws, pop_firwsord, windows
%123456789012345678901234567890123456789012345678901234567890123456789012
% Copyright (C) 2005 Andreas Widmann, University of Leipzig, widmann@uni-leipzig.de
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
function [beta, dev] = pop_kaiserbeta(dev)
beta = [];
if nargin < 1 || isempty(dev)
drawnow;
uigeom = {[1 1]};
uilist = {{'style' 'text' 'string' 'Max passband deviation/ripple:'} ...
{'style' 'edit' 'string' ''}};
result = inputgui(uigeom, uilist, 'pophelp(''pop_kaiserbeta'')', 'Estimate Kaiser window beta -- pop_kaiserbeta()');
if length(result) == 0, return, end
if ~isempty(result{1})
dev = str2num(result{1});
else
error('Not enough input arguments.');
end
end
devdb = -20 * log10(dev);
if devdb > 50
beta = 0.1102 * (devdb - 8.7);
elseif devdb >= 21
beta = 0.5842 * (devdb - 21)^0.4 + 0.07886 * (devdb - 21);
else
beta = 0;
end
end
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