1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
function f=comp_iufilterbank_td(c,g,a,Ls,skip,ext)
%-*- texinfo -*-
%@deftypefn {Function} comp_iufilterbank_td
%@verbatim
%COMP_IUFILTERBANK_TD Synthesis Uniform filterbank by conv2
% Usage: f=comp_iufilterbank_td(c,g,a,Ls,skip,ext);
%
% Input parameters:
% c : N*M*W array of coefficients.
% g : Filterbank filters - filtLen*M array.
% a : Upsampling factor - scalar.
% Ls : Output length.
% skip : Delay of the filters - scalar or array of length M.
% ext : Border exension technique.
%
% Output parameters:
% f : Output Ls*W array.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_iufilterbank_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 channel number
W=size(c,3);
%filter number
M=size(g,2);
%length of filters
filtLen = size(g,1);
% 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
f=zeros(Ls,W,assert_classname(c,g));
if(~strcmp(ext,'per'))
ext = 'zero';
end
skipOut = a*(filtLen-1)+skip;
% W channels are done simultaneously
for m=1:M
cext = comp_extBoundary(squeeze(c(:,m,:)),filtLen-1,ext,'dim',1);
ftmp = conv2(g(:,m),comp_ups(cext,a));
f = f + ftmp(1+skipOut(m):Ls+skipOut(m),:);
end
|
