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function f=comp_inonsepdgt_shear(coef,g,a,s0,s1,br)
%-*- texinfo -*-
%@deftypefn {Function} comp_inonsepdgt_shear
%@verbatim
%COMP_INONSEPDGT_SHEAR Compute IDGT
% Usage: f=comp_inonsepdgt_shear(c,g,a,lt,phasetype);
%
% Input parameters:
% c : Array of coefficients.
% g : Window function.
% a : Length of time shift.
% s0,s1,br : shearfind parameters
% Output parameters:
% f : Signal.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_inonsepdgt_shear.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=size(coef,1);
N=size(coef,2);
W=size(coef,3);
L=N*a;
b=L/M;
ar = a*b/br;
Mr = L/br;
Nr = L/ar;
ind = [ar 0; 0 br]*[kron((0:L/ar-1),ones(1,L/br));kron(ones(1,L/ar), ...
(0:L/br-1))];
phs = reshape(mod((s1*(ind(1,:)-s0*ind(2,:)).^2+s0*ind(2,:).^2)*(L+1) ...
-2*(s0 ~= 0)*ind(1,:).*ind(2,:),2*L),L/br,L/ar);
phs = exp(-pi*1i*phs/L);
ind_final = [1 0;-s1 1]*[1 -s0;0 1]*ind;
ind_final = mod(ind_final,L);
if s1 ~= 0
g = comp_pchirp(L,s1).*g;
end
if s0 == 0
c_rect = zeros(Mr,Nr,W,assert_classname(coef,g));
if 0
for w=0:W-1
c_rect(ind(2,:)/br+1+(ind(1,:)/ar)*Mr+w*M*N) = ...
coef(floor(ind_final(2,:)/b)+1+(ind_final(1,:)/a)*M+w*M*N);
c_rect(:,:,w+1) = phs.*c_rect(:,:,w+1);
end;
else
tmp1=mod(s1*a*(L+1),2*N);
for k=0:Nr-1
phsidx= mod(mod(tmp1*k,2*N)*k,2*N);
for m=0:Mr-1
phs = exp(-pi*1i*phsidx/N);
idx1 = mod( k ,N);
idx2 = floor(mod(-s1*k*a+m*b,L)/b);
for w=0:W-1
c_rect(m+1,k+1,w+1) = coef(idx2+1,idx1+1,w+1).*phs;
end;
end;
end;
end;
f = comp_idgt(c_rect,g,ar,[0 1],0,0);
else
c_rect = zeros(Nr,Mr,W,assert_classname(coef,g));
p = comp_pchirp(L,-s0);
g = p.*fft(g);
twoN=2*N;
cc1=ar/a;
cc2=mod(-s0*br/a,twoN);
cc3=mod(a*s1*(L+1),twoN);
cc4=mod(cc2*br*(L+1),twoN);
cc5=mod(2*cc1*br,twoN);
cc6=mod((s0*s1+1)*br,L);
for k=0:Nr-1
for m=0:Mr-1
sq1=mod(k*cc1+cc2*m,twoN);
phsidx = mod(mod(cc3*sq1.^2,twoN)-mod(m*(cc4*m+k*cc5),twoN),twoN);
phs = exp(-pi*1i*phsidx/N);
idx1 = mod( k*cc1 +cc2*m,N);
idx2 = floor(mod(-s1*k*ar+(s0*s1+1)*m*br,L)/b);
for w=0:W-1
c_rect(mod(-k,Nr)+1,m+1,w+1) = coef(idx2+1,idx1+1,w+1).*phs;
end;
end;
end;
f = comp_idgt(c_rect,g,br,[0 1],0,0);
f = ifft(bsxfun(@times,comp_pchirp(L,s0),f));
end
if s1 ~= 0
f = bsxfun(@times,comp_pchirp(L,-s1),f);
end
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