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/*!
* \file
* \brief Frequency filter test program
* \author Simon Wood and Adam Piatyszek
*
* -------------------------------------------------------------------------
*
* Copyright (C) 1995-2013 (see AUTHORS file for a list of contributors)
*
* This file is part of IT++ - a C++ library of mathematical, signal
* processing, speech processing, and communications classes and functions.
*
* IT++ 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.
*
* IT++ 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 IT++. If not, see <http://www.gnu.org/licenses/>.
*
* -------------------------------------------------------------------------
*/
#include <itpp/itsignal.h>
#include "gtest/gtest.h"
using namespace itpp;
using namespace std;
TEST (FreqFilt, All)
{
static const double eps = 1e-4;
int i;
vec b = "1 2 3 4";
vec x(20);
x.zeros();
x(0) = 1;
// Define a filter object for doubles
Freq_Filt<double> FF(b, x.length());
// Filter the data
vec y = FF.filter(x);
// Check the FFT and block sizes that were used
int fftsize = FF.get_fft_size();
int blksize = FF.get_blk_size();
ASSERT_EQ(8, fftsize);
ASSERT_EQ(5, blksize);
vec y_ref = "1 2 3 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
for (i = 0; i < y.length(); ++i) {
ASSERT_NEAR(y_ref[i], y[i], eps);
}
// Test streaming mode
x = linspace(0, 10, 100);
Freq_Filt<double> FFS(b, x.length());
vec y1 = FFS.filter(x(0, 49), 1);
vec y2 = FFS.filter(x(50, 99), 1);
vec conc = concat(y1, y2);
vec conc_ref = "0 0.10101 0.40404 1.0101 2.0202 3.0303 4.0404 5.05051 6.06061 7.07071 8.08081 9.09091 "
"10.101 11.1111 12.1212 13.1313 14.1414 15.1515 16.1616 17.1717 18.1818 19.1919 20.202 21.2121 22.2222 "
"23.2323 24.2424 25.2525 26.2626 27.2727 28.2828 29.2929 30.303 31.3131 32.3232 33.3333 34.3434 35.3535 "
"36.3636 37.3737 38.3838 39.3939 40.404 41.4141 42.4242 43.4343 44.4444 45.4545 46.4646 47.4747 48.4848 "
"49.4949 50.5051 51.5152 52.5253 53.5354 54.5455 55.5556 56.5657 57.5758 58.5859 59.596 60.6061 61.6162 "
"62.6263 63.6364 64.6465 65.6566 66.6667 67.6768 68.6869 69.697 70.7071 71.7172 72.7273 73.7374 74.7475 "
"75.7576 76.7677 77.7778 78.7879 79.798 80.8081 81.8182 82.8283 83.8384 84.8485 85.8586 86.8687 87.8788 "
"88.8889 89.899 90.9091 91.9192 92.9293 93.9394 94.9495 95.9596 96.9697 97.9798";
for (i = 0; i < conc_ref.length(); ++i) {
ASSERT_NEAR(conc_ref[i], conc[i], eps);
}
}
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