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function f = comp_ifilterbank(c,g,a,L)
%-*- texinfo -*-
%@deftypefn {Function} comp_ifilterbank
%@verbatim
%COMP_IFILTERBANK Compute inverse filterbank
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_ifilterbank.html}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% 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/>.
M = numel(g);
classname = assert_classname(c{1});
% Divide filters into time domain and frequency domain groups
mFreq = 1:M;
mTime = mFreq(cellfun(@(gEl) isfield(gEl,'h') ,g)>0);
mFreq(mTime) = [];
f = [];
if ~isempty(mTime)
% Pick imp. resp.
gtime = cellfun(@(gEl) gEl.h, g(mTime),'UniformOutput',0);
% Call the routine
gskip = cellfun(@(gEl) gEl.offset ,g(mTime));
f = comp_ifilterbank_td(c(mTime),gtime,a(mTime),L,gskip,'per');
end
if ~isempty(mFreq)
% Pick frequency domain filters
gfreq = g(mFreq);
% Divide filters into the full-length and band-limited groups
mFreqFullL = 1:numel(gfreq);
amFreqCell = mat2cell(a(mFreq,:).',size(a,2),ones(1,numel(mFreq)));
mFreqBL = mFreqFullL(cellfun(@(gEl,aEl) numel(gEl.H)~=L || (numel(aEl)>1 && aEl(2) ~=1), gfreq(:),amFreqCell(:))>0);
mFreqFullL(mFreqBL) = [];
mFreqFullL = mFreq(mFreqFullL);
mFreqBL = mFreq(mFreqBL);
F = [];
if ~isempty(mFreqBL)
conjG = cellfun(@(gEl) cast(gEl.H,classname), g(mFreqBL),'UniformOutput',0);
foff = cellfun(@(gEl) gEl.foff, g(mFreqBL));
% Cast from logical to double.
realonly = cellfun(@(gEl) cast(isfield(gEl,'realonly') && gEl.realonly,'double'), g(mFreqBL));
F = comp_ifilterbank_fftbl(c(mFreqBL),conjG,foff,a(mFreqBL,:),realonly);
end
if ~isempty(mFreqFullL)
conjG = cellfun(@(gEl) cast(gEl.H,classname), g(mFreqFullL),'UniformOutput',0);
% In case some of the filters were BL
if isempty(F)
F = comp_ifilterbank_fft(c(mFreqFullL),conjG,a(mFreqFullL));
else
F = F + comp_ifilterbank_fft(c(mFreqFullL),conjG,a(mFreqFullL));
end
end
% In case some of the filters were TD
if isempty(f)
f = ifft(F);
else
f = f + ifft(F);
end
end
% W = size(c{1},2);
% M = numel(g);
% classname = assert_classname(c{1});
%
% f=zeros(L,W,classname);
%
% % This routine must handle the following cases
% %
% % * Time-side or frequency-side filters (test for isfield(g,'H'))
% %
% % * Cell array or matrix input (test for iscell(c))
% %
% % * Regular or fractional subsampling (test for info.isfractional)
%
%
% for m=1:M
% conjG=conj(comp_transferfunction(g{m},L));
%
% % For Octave 3.6 compatibility
% conjG=cast(conjG,classname);
%
% % Handle fractional subsampling (this implies frequency side filters)
% if isfield(g{m},'H') && numel(g{m}.H)~=L
% N=size(c{m},1);
% Llarge=ceil(L/N)*N;
% amod=Llarge/N;
%
% for w=1:W
% % This repmat cannot be replaced by bsxfun
% innerstuff=middlepad(circshift(repmat(fft(c{m}(:,w)),amod,1),-g{m}.foff),L);
% innerstuff(numel(g{m}.H)+1:end) = 0;
% f(:,w)=f(:,w)+(circshift(innerstuff.*circshift(conjG,-g{m}.foff),g{m}.foff));
% end;
% else
% if iscell(c)
% for w=1:W
% % This repmat cannot be replaced by bsxfun
% f(:,w)=f(:,w)+(repmat(fft(c{m}(:,w)),a(m),1).*conjG);
% end;
% else
% for w=1:W
% % This repmat cannot be replaced by bsxfun
% f(:,w)=f(:,w)+(repmat(fft(c(:,m,w)),a(m),1).*conjG);
% end;
% end;
% end;
% end;
%
% f = ifft(f);
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