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/* -*- c++ -*- */
/*
* Copyright 2012,2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gnuradio/filter/filterbank.h>
#include <cstdio>
#include <iostream>
#include <stdexcept>
namespace gr {
namespace filter {
namespace kernel {
filterbank::filterbank(const std::vector<std::vector<float> > &taps)
: d_taps(taps)
{
d_nfilts = d_taps.size();
d_fir_filters = std::vector<kernel::fir_filter_ccf*>(d_nfilts);
if (d_nfilts == 0) {
throw std::invalid_argument("The taps vector may not be empty.");
}
d_active.resize(d_nfilts);
// Create an FIR filter for each channel and zero out the taps
std::vector<float> vtaps(1, 0.0f);
for(unsigned int i = 0; i < d_nfilts; i++) {
d_fir_filters[i] = new kernel::fir_filter_ccf(1, vtaps);
}
// Now, actually set the filters' taps
set_taps(d_taps);
}
filterbank::~filterbank()
{
for(unsigned int i = 0; i < d_nfilts; i++) {
delete d_fir_filters[i];
}
}
void
filterbank::set_taps(const std::vector<std::vector<float> > &taps)
{
d_taps = taps;
// Check that the number of filters is correct.
if (d_nfilts != d_taps.size()) {
throw std::runtime_error("The number of filters is incorrect.");
}
// Check that taps contains vectors of taps, where each vector
// is the same length.
d_ntaps = d_taps[0].size();
for (unsigned int i = 1; i < d_nfilts; i++) {
if (d_taps[i].size() != d_ntaps) {
throw std::runtime_error("All sets of taps must be of the same length.");
}
}
for(unsigned int i = 0; i < d_nfilts; i++) {
// If filter taps are all zeros don't bother to crunch the numbers.
d_active[i] = false;
for (unsigned int j = 0; j < d_ntaps; j++) {
if (d_taps[i][j] != 0) {
d_active[i] = true;
break;
}
}
d_fir_filters[i]->set_taps(d_taps[i]);
}
}
void
filterbank::print_taps()
{
unsigned int i, j;
for(i = 0; i < d_nfilts; i++) {
printf("filter[%d]: [", i);
for(j = 0; j < d_taps_per_filter; j++) {
printf(" %.4e", d_taps[i][j]);
}
printf("]\n\n");
}
}
std::vector< std::vector<float> >
filterbank::taps() const
{
return d_taps;
}
} /* namespace kernel */
} /* namespace filter */
} /* namespace gr */
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