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
75
76
77
78
79
80
81
|
function [f]=comp_idwilt(coef,g)
%-*- texinfo -*-
%@deftypefn {Function} comp_idwilt
%@verbatim
%COMP_IDWILT Compute Inverse discrete Wilson transform.
%
% This is a computational routine. Do not call it
% directly.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_idwilt.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/>.
% AUTHOR : Peter L. Soendergaard.
% TESTING: OK
% REFERENCE: OK
M=size(coef,1)/2;
N=2*size(coef,2);
W=size(coef,3);
a=M;
L=N*a;
coef2=zeros(2*M,N,W,assert_classname(coef,g));
% First and middle modulation are transferred unchanged.
coef2(1,1:2:N,:) = coef(1,:,:);
if mod(M,2)==0
coef2(M+1,1:2:N,:) = coef(M+1,:,:);
else
coef2(M+1,2:2:N,:) = coef(M+1,:,:);
end;
if M>2
% cosine, first column.
coef2(3:2:M,1:2:N,:) = 1/sqrt(2)*coef(3:2:M,:,:);
coef2(2*M-1:-2:M+2,1:2:N,:) = 1/sqrt(2)*coef(3:2:M,:,:);
% sine, second column
coef2(3:2:M,2:2:N,:) = -1/sqrt(2)*i*coef(M+3:2:2*M,:,:);
coef2(2*M-1:-2:M+2,2:2:N,:) = 1/sqrt(2)*i*coef(M+3:2:2*M,:,:);
end;
% sine, first column.
coef2(2:2:M,1:2:N,:) = -1/sqrt(2)*i*coef(2:2:M,:,:);
coef2(2*M:-2:M+2,1:2:N,:) = 1/sqrt(2)*i*coef(2:2:M,:,:);
% cosine, second column
coef2(2:2:M,2:2:N,:) = 1/sqrt(2)*coef(M+2:2:2*M,:,:);
coef2(2*M:-2:M+2,2:2:N,:) = 1/sqrt(2)*coef(M+2:2:2*M,:,:);
f = comp_isepdgt(coef2,g,L,a,2*M,0);
% Apply the final DGT
%f=comp_idgt(coef2,g,a,[0 1],0,0);
% Clean signal if it is known to be real
if (isreal(coef) && isreal(g))
f=real(f);
end;
|
