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/*!
* \file
* \brief Implementation of Freq_Filt Class
* \author Simon Wood
*
* -------------------------------------------------------------------------
*
* IT++ - C++ library of mathematical, signal processing, speech processing,
* and communications classes and functions
*
* Copyright (C) 1995-2008 (see AUTHORS file for a list of contributors)
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* -------------------------------------------------------------------------
*/
#include <itpp/signal/freq_filt.h>
#include <itpp/signal/transforms.h>
#include <itpp/base/math/elem_math.h>
//! \cond
namespace itpp {
// Overlap-add routine
template<class Num_T>
void Freq_Filt<Num_T>::overlap_add(const cvec&x, cvec &y)
{
int nb = impulse.length();
int nx = x.length();
y.set_size(nx,false);
y.zeros();
cvec X,Y;
int istart = 0;
int L = blksize;
while(istart < nx)
{
int iend = std::min(istart+L-1,nx-1);
X = fft(x(istart,iend),fftsize);
Y = ifft(elem_mult(X,B));
Y.set_subvector(0,nb-2,Y(0,nb-2) + zfinal);
int yend = std::min(nx-1,istart+fftsize-1);
y.set_subvector(istart,yend,Y(0,yend-istart));
zfinal = Y(fftsize-(nb-1),fftsize-1);
istart += L;
}
}
template<>
vec Freq_Filt<double>::overlap_add(const vec &x)
{
cvec y; // Size of y is set later
overlap_add(to_cvec(x),y);
return real(y);
}
template<>
svec Freq_Filt<short>::overlap_add(const svec &x)
{
cvec y; // Size of y is set later
overlap_add(to_cvec(x),y);
return to_svec(real(y));
}
template<>
ivec Freq_Filt<int>::overlap_add(const ivec &x)
{
cvec y; // Size of y is set later
overlap_add(to_cvec(x),y);
return to_ivec(real(y));
}
template<>
cvec Freq_Filt<std::complex<double> >::overlap_add(const cvec &x)
{
cvec y; // Size of y is set later
overlap_add(x,y);
return y;
}
} // namespace itpp
//! \endcond
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