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function h=ref_pconv_ola_fir2long(f,g,Lb)
%-*- texinfo -*-
%@deftypefn {Function} ref_pconv_ola_fir2long
%@verbatim
%
% This function implements periodic convolution using overlap-add. The
% window g is supposed to be extended by fir2iir.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/reference/ref_pconv_ola_fir2long.html}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.2.0
%
% 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 3 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, see <http://www.gnu.org/licenses/>.
L=length(f);
Lg=length(g);
% Number of blocks
Nb=L/Lb;
% Length of extended block and padded g
Lext=Lb+Lg;
gpad=fir2long(g,Lext);
b2=Lg/2;
h=zeros(L,1);
for ii=0:Nb-1
block=pconv(postpad(f(ii*Lb+1:(ii+1)*Lb),Lext),gpad);
h(ii*Lb+1:(ii+1)*Lb)+=block(1:Lb); % Large block
s_ii=mod(ii+1,Nb);
h(s_ii*Lb+1:s_ii*Lb+b2)+=block(Lb+1:Lb+b2); % Small block +
s_ii=mod(ii-1,Nb)+1;
h(s_ii*Lb-b2+1:s_ii*Lb)+=block(Lb+b2+1:Lext); % Small block -
end;
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