function outsig=ufilterbankz(b,a,insig,hopsize)
%UFILTERBANKZ Uniform Filter bank with zero boundary condition
% Usage: outsig=ufilterbankz(b,a,insig);
% outsig=ufilterbankz(b,a,insig,hopsize);
%
% UFILTERBANKZ(b,a,insig) filters the input signal with the filters
% described in a and b.
%
% UFILTERBANKZ(b,a,insig,hopsize) does the same, but only outputs every
% hopsize sample in the time domain.
%
% If a and b are matrices then each row corresponds to a subband
% channel.
%
% If insig is a matrix then filtering is applied along the columns.
%
% If f is a single vector, then the output will be a matrix, where each
% column in f is filtered by the corresponding filter in g. If f is
% a matrix, the output will be 3-dimensional, and the third dimension will
% correspond to the columns of the input signal
% See also: gammatone, filterbankz, auditoryfilterbank
%
% Url: http://amtoolbox.org/amt-1.4.0/doc/common/ufilterbankz.php
% #Author : Peter L. Søndergaard
% This file is licensed unter the GNU General Public License (GPL) either
% version 3 of the license, or any later version as published by the Free Software
% Foundation. Details of the GPLv3 can be found in the AMT directory "licences" and
% at <https://www.gnu.org/licenses/gpl-3.0.html>.
% You can redistribute this file and/or modify it under the terms of the GPLv3.
% This file is distributed without any warranty; without even the implied warranty
% of merchantability or fitness for a particular purpose.
%% ------ Checking of input parameters ---------
narginchk(3,4);
if nargin==3
hopsize=1;
end;
%% ------ Computation --------------------------
[insig,siglen,dummy,nsigs,dim,permutedsize,order]=assert_sigreshape_pre(insig,[],[], ...
upper(mfilename));
nchannels=size(b,1);
outlen=ceil(siglen/hopsize);
outsig=zeros(outlen,nchannels,nsigs);
for ii=1:nchannels
res = filter(b(ii,:),a(ii,:),insig);
res = res(1:hopsize:siglen,:);
outsig(:,ii,:) = reshape(res,outlen,1,nsigs);
end;
% Modify permutedsize and order to reflect that first dimension has split
% in two
permutedsize=[outlen,nchannels,permutedsize(2:end)];
order=assert_groworder(order);
outsig=assert_sigreshape_post(outsig,dim,permutedsize,order);