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function c=comp_atrousfilterbank_td(f,g,a,offset)
%-*- texinfo -*-
%@deftypefn {Function} comp_atrousfilterbank_td
%@verbatim
%COMP_ATROUSFILTERBANK_TD Uniform filterbank by conv2
% Usage: c=comp_atrousfilterbank_fft(f,g,a,skip);
%
% Input parameters:
% f : Input data - L*W array.
% g : Filterbank filters - filtLen*M array.
% a : Filter upsampling factor - scalar.
% offset: Delay of the filters - scalar or array of length M.
%
% Output parameters:
% c : L*M*W array of coefficients
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_atrousfilterbank_td.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/>.
%input data length
L=size(f,1);
%input channel number
W=size(f,2);
%filter number
M=size(g,2);
g = comp_ups(g,a,1);
%length of filters
filtLen = size(g,1);
skip = -offset;
% Allow filter delay only in the filter support range
if(all(skip>=filtLen) || all(skip<0))
error('%s: The filter zero index position outside of the filter support.', upper(mfilename));
end
if(numel(skip)==1)
skip = skip*ones(M,1);
end
% Output memory allocation
c=zeros(L,M,W,assert_classname(f,g));
% Explicitly extend the input. length(fext) = length(f) + 2*(filtLen-1)
fext = comp_extBoundary(f,filtLen-1,'per','dim',1);
% CONV2 does 2-D linear convolution. 'valid' option crops tails
% length(fextconv2) = length(f) + (filtLen-1)
% length(c(:,m,:)) = N
% W channels done simultaneously by conv2
for m=1:M
c(:,m,:) = comp_downs(conv2(fext,g(:,m),'valid'),1,skip(m),L);
end;
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